Sewage Treatment- English Translation-On Monday, The 21st of May, 2012

7/31/2019 Sewage Treatment- English Translation-On Monday, The 21st of May, 2012

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Dch Anh -VitTrn Thanh Lng

DOMESTIC SEWAGE TREATMENTS SYSTEMH THNG X L NC THI

MC LC/INDEX

TrangMC LC/INDEX .................................................................................................1

PHN 03 80DOMESTIC SEWAGE TREATMENTS SYSTEMH THNG X L NC THI ......................................................................2

ong Nai 4 Hydro powerhouse -Nh my thu in ng Nai 4 1


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PHN 03 80...............................................................................................................

DOMESTIC SEWAGE TREATMENTS SYSTEM

H THNG X L NC THI

Instruction Manual

Hng Dn Vn HnhPart 1-27/02/2012

1. General Information/Gii thiu chung

Theres plenty of organic compound and virus and bacteria in domestic

sewage. If without effective treatment, itll be sure to seriously pollute the

environment around us and harm our health. In this system, the technology

employs biochemical combined with physic-chemical treatment method. The

equipment is made up of fabricated steel integrated structure and is set in the

ground. The operation of this system is automatically controlled and theeffluent water shall satisfy the local effluent standard of Vietnam.

S phong ph v hp cht hu c v vi rt v vi khun n cha trong nc

thi sinh hot. Nu khng c bin php x l hiu qu, n chc chn s gy

ra nhim nghim trng ti mi trng xung quanh v gy nh hng tn

hi ti sc khe chng ta. h thng ny, K thut cng ngh c s dng

kt hp vi phng php x l ha-l. Thit b c lm bng kt cu thp

c v c t di mt t. S hot ng ca h thng ny l t ng

iu khin v nc thi c qua x l phi m bo tiu chun nc

thi Vit Nam.

2. Water quality & quantity/ Cht lng v s lng

The scale of this sewage treatment system is designed for 6.05 m3/d.

Qmax=1 m3/h

Quy m ca h thng x l nc thi c thit k cho 6.05m3/d v lu



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lng Qmax=1 m3/h

For the standard of the input sewage quality of the sewage treatment system,

the domestic-sewage quality of hydropower stations of Vietnam and China ofthe same kind is taken as the reference, and on this condition, the effluent

water shall be in conformity with the effluent standard of Vietnam.

i vi tiu chun v cht lng nc thi u vo ca h thng x l nc

thi, cht lng nc thi sinh hot ca cc nh my thy in Vit Anm v

Trung Quc cng loi c th thc hin nh tham kho v trong cng iu

kin.

3. Process flow chart/ Lu qu trnh thc hin

To be Continued next part -Part 2-04/03/2012

ong Nai 4 Hydro powerhouse -Nh my thu in ng Nai 4

Mn chn rc/B cn bng

Ncthisinhhot

B xxxx B xi hasinh hc

B lng cn th 2

B tiu hy. Bm thi khX nc sch ra ngoi

Loi b bn

B tiu hy bnCht lng

3


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Part 2-05/03/2012 To be Continued preview t part -Part 1-27/02/2012

4. Process Description/ M t qu trnh

The mature, reliable A/O two-stage biochemical combining phy-chemical

treatment method is employed in this treatment process and that will enable it

to stably satisfy the effluent standard. The detailed descriptions are as

follows:

n k hn , phng php x l kt hp hai giai on ha sinh kt hp c

dung s dng trong qu trnh x l v iu s c kh nng lm cho n

tr nn n nh p ng cc tiu chun nc thi ra. M t chi tit c ch

ra nh sau:

4.1. Equalization pool/ B cn bng

Due to the non-uniformity of the sewage quantity & quality at different

times, in order to guarantee the continuous operation of downstreamequipments, an equalization pool is equipped for storing sewage and

homogenizing water quality, which will guarantee the quality of the effluent

water.

Bi v s khng ng nht ca s lng v cht lng nc thi ti cc thi

im khc nhau. m m bo vn hnh lin tc ca thit b theo hng

dng chy (thit b h lu ?), mt b cn bng s c trang b d tr

nc thi v ng nht cht lng nc, ni s m bo cht lng nc

thi ra

While the sewage goes into the equalization pool, it first goes through the bar

screen to remove the soft fiber objects and big-granule impurities to prevent

the blockage of the water pumps, valves or pipelines, which will ensure the

equipment in normal operating. The bar screen needs to be manually cleaned

up periodically, usually once every 15 to 30 days.Trong khi nc thi i vo b cn bng, n trc tin n i qua mng chn



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loi b nhng si dy mm v nhng tp cht bn ln-nh d bn

ngn chn tc ngn bm nc, van hay cc ng ng, n s m bo cc

thit b hot ng bnh thng. Mnh chn rc cn lm sch nh k bngtay, thng thng 15-30 ngy mt ln.

Since the equalization pool has a large cubage, its easy for suspended

particles or impurities to precipitate, which will lead to deposition of sludge

and fermentation. Therefore, an underwater stirring device is equipped. In

this system, air agitation is employ for under-water stirring to guarantee the

uniformity of the water in the pool.

T khi b cn bng y th tch, n d dng lm cho cc tp cht hay cc

ht nh l lng kt ta, cc cht ny s to thnh bn lng ng xung v

ln men.Bi vy, mt thit b khuy sc bn di nc c trang b. trong

h thng ny, khng kh c s dng khuy trn sc bn di nc

m bo ng nht nc thi trong b.

The sewage pump of the equalization pool will lift the sewage into oxygen

deficit tank.Cc bm nc thi ti b cn bng s y nc thi va bn trong b xc

kh oxy.

To be Continued next part -Part 3-12/03/2012



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Date: On Monday, 9th of April, 2012

4.2. Oxygen deficit tank /B hao ht kh Oxy????In the oxygen deficit tank, the organic matters in the sewage are taken as the

carbon source to mix with the circulating-reflux turbid water for the oxygen-deficit

denitrogenation reaction. Under the actions of anaerobic microorganism, itll

decompose organic nitrogen in the mixed sewage into the ammonia nitrogen. In the

meantime, the organic carbon source is taken as the supplier of electrons to turn

nitrous-acid nitrogen and nitric-acid nitrogen into nitrogen, forming N2 or NxOy

which disappear into the atmosphere, in this way, the purpose ofdenitrogenation is

realized.

Bn trong b b hao ht, cc vt cht hu c trong nc thi c thc hin

nh ngun cc bon trn ln vi dng nc c chy tun hon cho phn ngxxx

hao ht oxy. Di anh hng ca cc vi sinh vt him kh(k kh), n s phn hy

cc cht Nito Hu c ln trong nc thi thnh Nito Amoniac. Trong thi gian

trung bnh ny, ngun cc bon hu c s c thc hin nh nh cung cp cc int nitrous-acid nitrogen v nitric-acid nitrogen thnh Nito, dng N2 hoc NxOy,

cht m s i vo kh quyn. Bng cch ny, mc ch ca denitrogenation c

thc hin

The oxygen deficit tank can also remove a lot of suspending or organic matters

from the sewage. It also can degrade solid objects into soluble materials. At the

same time, to strengthen processing efficiency of the oxygen deficit tank, floating ball

fillings are put inside. The effluent water from the oxygen-deficit tank will go intothe second-stage contact oxidation tank.

B hao ht kh Oxy ccos th cng loi b c cc tp cht l lng hay cc tp

cht hu c t nc thi. N cng c th lm suy bin cc vt th rn thnh cc

cht ha tan. Ti cng thi gian ny, tng cn hiu qu x l ca b hao ht

oxy, cc qu bong ni cng c t y vo bn trong. Kt qu nc thi qua

t b hao ht oxy s chy vo b oxy ha giai on 2



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Date: On Monday, 16th of April, 2012

4.3. Biological-Contact Oxidation Tank / B Oxy ha sinh hc

The oxygen-deficit treated sewage goes into the contact oxidation tankthe tank willmake plenty of aeration. It uses microorganisms to degrade the CODBOD5 organic

matter in the water and also remove organic phosphor. This system employs

biological-contact oxidation as the main process to remove organic

substanceswhich has the following characteristics:

Nc thi x l b hao ht oxy s i vo b oxy ha sinh hc, b ny s cung

cp phong ph lng kh oxy vo. N s dng sinh vt him kh lm suy bin cc

cht hu c nh COD, BOD5 trong nc v cng loi b cc phot pho hu c. H

thng ny s dng qu trnh oxy ha sinh vt l mt qu trnh chnh loi b cc

tp cht hu c, cht m c cc c tnh tiu biu sau:

A High treatment capacity and less land occupation.

A-Kh nng s l cao v chim thi gian din tch t.

BThe microorganisms and bacteria for contacting oxidation grows in the

fillings, so there is no need for sludge reflux, which will not cause sludge expansionand it also has good impact-resistant performance.

B- Cc vi sinh vt v vi khun cho qu trnh oxy ha pht trin, v cng khng

cn lng bn chy ngc, ci m s khng lm bn lan rng ra v cng chu va

p tt.

CSince the fillings have secondary-separation effect to the air, the utilization

rate of the oxygen in the air is greatly enhanced, which can efficiently reduce the

power consumption.

C- T khi nc thi y, hiu qu s dng ca oxy trong khng kh cng c

tng cao, iu ny c th lm gim tiu th nng lng ngun

The shape of this contact oxidation tank is rectangle, and according to 1:1

proportion, is divided in 2 stages. To ensure full degradation of organic pollutants,

especially soluble pollutants and the elimination of ammonia nitrogen, the first-stage

tank is a high-load oxidation tank while the terminal-stage is a low-load oxidation

tank.



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Hnh dng ca b ny l hnh hp ch nht, theo t l 1:1, c chia lm 2 giai

on. m bo phn huy hon ton cht nhim hu c, c bit cc cht gy

nhim ha tan c v s kh Ni-t, giai on u tin l b xi ha cht thi caotrong khi giai on cui l b xi ha thp.

Internationally advanced floating-ball fillings will be applied as the filling

material, while variable micropore aerators are used for aeration, and ABS

engineering plastic tubes are used as aerator piping.

Cc qu bng c th y trong khoang s c s dng nh vt liu in

y, trong khi cc thit b sc kh c a vo hot ng, v cc ng nha cng

ngh ABS c s dng lm ng cho qu trnh sc kh

4.4. Secondary Sedimentation Tank/B lng ng th 2

The secondary sedimentation tank is equipped to remove the microorganism

corpses after oxidation. The sludge in the sedimentation tank will be pumped by the

sludge lift pump into sludge digestion tank to get digested. Then the supernatant

liquid of the sedimentation tank will naturally flow into the disinfection tank.

B lng ng cn th 2 c trang b loi b cc vi sinh vt nh cht saukhi qua giai on o xi ha. Cc bn lng trong b lng ny s c bm vo b tiu

hy bi cc b ht bn tiu hy. Cc loi bn lng l lng hoc lng trn mt

ca b lng s t nhin chy vo b ty u.

4.5. Disinfection Tank / B ty u kh trng nc thi

The disinfection is used for killing the germs and microbes of the purified water

to ensure the indexes of bacteria such as coli will meet the effluent standard.

Chlorine contact-blending disinfection method orfolded-plate blending reaction

disinfecting method required to be employed in this system. This disinfected device

can change the dosage according to the amount of sewage to be treated, that means

the dosage will be higher for higher amount of sewage, and be lower for lower

amount of sewage. The disinfected water can be directly drained off.

B ty u kh trng c s dng tiu hy cc mm bnh v vi trng, vi

khun ca h thng nc sch m bo ch s vi khun nh coli ph hp vitiu chun nc thi. Phng php ty u bng Clo hoc folded-plate blending



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reaction c ( em cha dch c )dng cho h thng ny. Thit b ty u c th

thay i liu lng ty theo s lng nc thi cn x l. iu c ngha l liu

lng s c iu chnh cao hn hay thp hn cho s lng nc thi nhiu hay t.Nc c ty u kh trng c th x trc tip ra ngoi.

4.6. Sludge Tank/ B tiu hy, ht bn cn

After lifting, the sludge in the secondary sedimentation tank is input to the sludge

digestion tank to get anaerobic digestion. Most of the organic sludge can be digested

during the process. The supernatant liquid of sludge will return to the equalization

pool with little residual sludge left. The residual sludge will be regularly pumped and

transported outside by the Environmental Sanitation Department engaged by the

owner.

Sau khi c bm ln, cc bn trong b lng ng th 2 c a vo b tiu

hy v ht bn cn tiu hy k kh bn cn. Phn ln cc bn lng hu c c

tiu hy trong sut qu trnh. Cc loi bn lng l lng s c a tr li vo b

cn bng v cn t st li. Bn cn st li s c bm v vn chuyn u n ra bn

ngoi phng v sinh mi trng ca ch u t.

4.7. Roots Blower/ Thit b thi sc kh

The Roots blower provides aeration with air. This system is equipped with 2

blowers, one running while one on standby.

Thit b sc thi kh cung cp lung kh vi khng kh vo. H thng ny c

trang b 02 bm thi, trong o1 lm vic v 01 d phng.



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Date: On Monday, 23rd of April, 2012

5. Design Parameters of Major Equipment & Constructions/ Thng s

thit k ca cc thit b chnh

Model No./ Kiu WSZ-1

Quantity / S lng one set /01 b

Sewage treatment capacity/ Dung tch x l 1m3/h

Dimensions (length*width*height) 750020002250

Kch thc (Dai x Rng x Cao) 750020002250Net height, actual total height is 2550)

(Chiu cao c bn, tn chiu cao thc t l 2550)

Material/ Vt liu subassemblies/ lp rp

The following equipments are included in the system, and the parameters given

below are for a single equipment:/

Nhng thit b sau y bao gm trong h thng. Thng s a ra bn di l

ca 01 thit b

5.1. Equalization pool/ b cn bng

Quantity / S lng one pool/ 01 b

External dimensions (length*width*depth) 200020002250mm

Kch thc bo ph( di* rng* su) 200020002250mm

Effective volume / Th tch khi 8m3

Hydraulic power residence time 24 hours or longerQu trnh ng 24h hoc lu hn

Material /Vt liu steel with anticorrosion/ Thp vi

chng n mn

Accessories/ Ph kin

Bar Screen/ Thanh chn rc

Quantity / S lng one screen/ 01 thanh

Specification/ Thng s k thut 400X400



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Material/ Vt liu steel with anticorrosion/ Thp chng n mn

bar gap/ Khe h 5mm

Sewage Lift Pump/ Bm nngQuantity / S lng two units/ 02 b

Model No./ Kiu 50WQ/C240-0.75

Flow rate/ lu lng nh mc 6m3/h

Lift range / phm vi nng 8m

Power / cng sut in 0.75KW

Magnetic float level meter/ cng tc phao

Quantity / S lng one unit/ 01 b

Model No. / Kiu KEY10

Material / Vt liu PP

Output / tn hiu u ra High /low level switch signals / tn Tn

hiu mc Cao/thp

5.2. Oxygen Deficit Tank / b hao ht Oxy ????

Quantity / S lng one tank/ 01 bExternal dimensions (length*width*height) 150010002250mm

Kch thc bao ph (Di* rng* cao): 150010002250mm

Sewage treatment capacity / Dung tch x l 1.0m3/h

Effective volume/ Th tch khi 3.0m3

Hydraulic power residence time/ thi gian qu trnh ng 3.0h

Material/ Vt liu steel with anticorrosion/ Thp chng n mn

Packing rate of fillings / Kh nng in y 40%

Dissolved oxygen / Lng xy ha tan 0.5mg/L

5.3. Biological Oxidation Tank / B oxy ha sinh hc

Quantity / s lng one set/ 01 b

External dimensions(length*width*height) 200015002250mm





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Material steel with anticorrosionPacking rate of fillings 40%Material/ Vt liu steel

with anticorrosion/ Thp chng n mn

Packing rate of fillings / Kh nng in y 40%

Dissolved oxygen / Lng xy ha tan 3.5mg/L

5.4. Secondary sedimentation tank / B lng ng th 2

Quantity / s lng one tank/ 01 b

External dimensions(length*width*height) 150010002250mm



Surface load/ B mt 1.0m3/m2.h

Rising flow speed / tc chy tng 0.28mm/S

material / vt liu steel with anticorrosion/ thp chng n mn

Fillings / in y D50 hexagonal cellular fillings

5.5. Disinfection Tank / b kh trng ty u

Quantity / s lng one tank/ 01 b

External dimensions / kch thc bao ph 50010002250mm




Material / Vt liu steel with anticorrosion/ thp chng n mn

Type /Loi Folded-plate reaction type/

5.6. Sludge Digestion Tank / B tiu hy v ht bn

Quantity / S lng one tank/ 01 b

External dimensions / Kch thc bao ph 100015002250mm

Effective volume/ th tch khi 4m3

Material / vt liu steel with anticorrosion/ thp chng n mn



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5.7. Air blower room / ngn thi kh sc bn

Quantity / s lng one room/ 01 ngn

External dimensions / Kch thc bao ph 200015002250mmMaterial / vt liu steel with anticorrosion/ thp chng n mn

Accessories included/ ph kin bao gm

Roots Blower / bm thi kh

Quantity / S lng 2 (One running while one on standby)/ 02 b

( 01 lm vic v 01 d phng)

Model No. / Kiu HC251S

Wind flow / Tc gi 0.29m3/min

Wind pressure / p lc y 3000mmH2O

Rorating speed / tc vng quay 450r/min

Power / cng sut in N=0.55KW

The Electrical Controlling System / H thng iu khin

Control of the whole system / H thng iu khin ton b h thng

Quantity / S lng one unit/ 01 b

Model No./ Kiu JYZK-1

Total power / Cng sut tng 2.8KW

Controlling mode / loi iu khin Full-automatic/ t ng

Other accessories/ ph kin khc

PLC controller / b iu khin lp trnh

Quantity / s lng One unit/ 01 bManufacturer / Nh ch to Mitsubishi, JapanOther electrical components & elements / thnh phn in khc

Quantity / S lng one set / 01 b

Make/ sn xut Famous brand made in China/ Chi nhnh ca

Trung quc

List of power of electrical appliances / Danh sch cc thit b in



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SerialNo.

Name/tnQuantity/S lng

(KW)Power/Cng sut in

ActualUtilizationRate/ Hiusut thc t

Actualworking

Power/Cn

g sut thctSingle

Unit/ 01b

Total/tng

1

Immersible sewage dischargePumps/ Bmchm

2 0.75 1.5 50% 0.75

2 Blowers/ Bmthi

2 0.55 1.10 50% 0.55

3 Others/ Khc 0.20 0.05

Total/ Tng 2.8 1.35



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Date: On Monday, The 7th of May, 2012

6. Description of Automatic Control

This sewage treatment system is mainly controlled by PLC which has thefunctions of open-phase protection, overload protection, self-recovery after

power failure, etc. This system employs full-automatic operation and manualadjustment, and it can be operated both automatically and manually. Forcommissioning or overhaul, it can be controlled manually, and then can beswitched to automatic control for normal operation. This system appliessequential control for the whole course of sewage treatment, and is mainlycomposed of the following parts:

6.1. Control of the sewage lift pump

This system is equipped with 2 sewage lift pumps, one running while one onstandby. The operation of the pumps is controlled by the liquid level. Turn onthe pump when the liquid level is high and turn it off when the liquid level islow.

6.2. Sludge lifter

According to the cumulate working time of the immersible dischargingpump, discharge sludge periodically.

6.3. Control of the blowerThe biochemical contact oxidation tank system is equipped with 2 air

blowers, two for running while one on standby with switchover as per time.According to the equipment working conditions, the blowers automaticallystart and stop. In order to meet the oxygen demand in the tank and guaranteethat the biomembrane doesnt die of oxygen deficit, during long idle periodof the system, one blower shall be turned on as per set interval to keepaeration for some certain time after the system through long period ofunused,

7. Operation

7.1. Preparation

1) Make sure all manual valves are in the right position.

2) Make sure the valves beside the wind pipe of every air blower are in open

state.

3) Check oil window of the air blower to see if theres enough oil and whether



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lubrication is ok.

4) Check water pump piping to make sure theres no leakage.

5) Check the circuits and make sure the wiring of the control cabinet is correct,

the voltage and current meet the requirements, and the display is correct.

6) Check the automatic-control instruments such as the level meter, and make

sure their state-indicating signals and displays are all correct.

7) Check the grounding wire contact, and make sure the resistance of all

electrical devices to the ground is good.

8) Check and make sure the voltage is up to the requirement and three-phase

voltage is balance.



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Date: On Monday, The 14th of May, 2012

7.2. Startup and operation of the system/ Bt u vn hnh h thng

(1) Turn on the master switch of power source, and then turn on the automatic-operation switch of all the devices.

Bt cng tc ngun chnh v bt cng tc chuyn i sang ch t ng tt

c cc thit b

(2) Adjust each valves opening extent and adjust them till each equipment isrunning in a normal state.

iu chnh m mi van v iu chnh chng cho n khi mi thit b chy trng thi bnh thng

(3) After the system has been running well for 2 hours, the system can be keptrunning by itself without human operation.

Sauk hi h thng chy tt trong 2 gi, h thng c th gi tip tc chy m

khng c s c mt ca con ngi

(4) After 240 hours of normal operation, the sewage treatment system enters intoa stable state of operation with continuous water input and output.

Sau 240 gi vn hnh bnh thng, h thng x l nc thi sinh hot s i vo

trng thi vn hnh n nh.

(5) When the power failure happens, all electrical devices will stop working.When power supply is recovered, they will all automatically resume working( if they are all set in automatic running mode). If the electrical devices areset in manual mode, they shall be manually restarted as per practical needs.

Khi sy ra s c li mt ngun, tt c cc thit b in s dng lm vic. Khi c

ngun cung cp tr li, chng s t ng tip tc li lm vic ( nu chng c

ci t kha la chn chy t ng)

7.3. Biomembrane cultivation/ S m rng vi sinh vt (Biomembrane)

khng bit c chnh xc khng?/(1) The sewage goes into the equipment.



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Nc thi i vo bn trong thit b

(2) Turn on the air blower and the sewage pump, and reduce the air blowersoxygenation capacity to about half of the normal capacity.

Bt my thi sc kh v bm nc thi. gim lng oxy n khong na mcbnh thng

(3) Observe the fillings in the oxygen tank every day. If on the fillings theregrows orange-yellow or orange-black sticky matter, it means the

biomembrane has been cultivated, normally the cultivating period will take25-30 days to complete.

Quan st s in y bn trong b oxy mi ngy. Nu s in y pht trinm thy mu vng da cam hay en sm da cam, iu ngha l vi sinh vt

c mwor rng, bnh thng chu k m rng s cn 25-30 ngy honthin

(4) Normally the most suitable temperature is 15 -25 Celsius.

Nhit bnh thng ph hp ,l 15- 25oC

(5) If the raw sewage concentration is too low, itll take too long time to cultivatebiomembrane, so sometimes its necessary to add a little nutrients, which canbe excrement or other nutrients.

Nu nc thi th tp trung qu thp, n s cn mt thi gian di tngcng m rng vi sinh vt, b vy thnh thong cn b sung them cht dinh

dng, n c th l phn hoc cc cht dinh dng khc(6) The PH value must be guaranteed between 6.5-8.5 and the raw sewage must

be sure to reach a biochemical state.

Nng PH phi m bo trong khong 6.5- 8.5 v nc thi th phi m

bo t ti trng thi ha sinh



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Date: On Monday, The 21st of May, 2012

8. Operation management, maintenance and troubleshooting/ Qun l

vn hnh, bo dng v x l s c

8.1. Operation management/ Qun l vn hnh

(1) Adjust the water pumps and air blowers to normal state.

iu chnh cc bm nc v cc bm thi kh ti trng thi bnh thng

Work according to the designed operating procedure, and keep observing thegrowth situation of the biomembrane.

Qu trnh lm vic phi ph hp vi quy trnh thit k v tip tc quan st

trng thi tng trngca cc vi sinh vt biomembrane(2) Usually, the control cabinet is kept in automatic working state, and only one

person is needed for patrol and checkup of the operation as well assupplementing the disinfectant.

Thng l, t iu khin c gi trng thi t ng lm vic v ch duynht mt ngi l cn thit kim tra v kim sot s vn hnh cng nhb sung cht ty u kh trng

8.2. Maintenance/ Bo dng

(1) Make sure no lump or granule solid objects in the sewage shall get into theequipment, otherwise the pipes might be blocked up and the pumps damaged.

m bo rng khng c bt c cc vt th rn nh hay tng tng bn trongnc thi chy vo trong cc thit b, nu khng th cc ng ng c th bb tc ngn v gy h hng cc bm

(2) To avoid accidents and prevent solid objects from falling into the equipment,the manhole of the equipment should be well covered.

ngn nga cc ri ro v ngn chn cc vt th rn ri vo trong ccthit b, cc np thm quan st ca cc thit b nn c y cn thn

(3) The PH value of the sewage that enters the equipment should be keptbetween 6-9, because too acidic or too alkaline sewage will affect thebiomembranes normal growth.

Nng PH ca nc thi chy vo thit b nn gi m bo trong khong6-9, bi v nu nc thi c tnh axit hoc kim mnh s gy nh hng n

s tng trng ca cc vi sinh vt

(4) The maintenance & repair of the water pumps and air blowers shall all bedone according to their instruction manuals. To prolong the blowers servicelife, it needs to change the lubricating oil once every 6 months.

S bo tr sa cha cc bm nc v cc my thi sc kh s c thc hintheo ti liu hng dn vn hnh ca chng. Nu tui lm vic cc my thi



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qu hn, n cn c tra du m bi trn 6 thng/ ln

(5) The air inlet of the blowers should be guaranteed to be unblocked.

Cc u thi kh vo ca cc my thi nn c m bo khng b tc ngn.8.3. Trouble shooting/ Khc phc x l s c mt s li

Fault symptoms/Cc du hiu li

Causes/ Nguyn nhnMeasures for trouble

clearance/Cc bin php khc phc

Poor effluent waterqualityfrom aerobic tank/Cht lng nc

chy yu t b k kh

Impurities have blocked up thepiping or openings/Cc tp cht bn c trong nclm tc ngn ng ng

Use pressure water orcompressed air to flush/Dng nc p lc hoc kh

nn thi vo

The biomembrane on thefillings becomes black due tooxygen deficit/Cc vi sinh vt bn trong trnn en bi v hao ht oxy

Increase the air volume of theblower/

Tng lng kh thi vo cacc my thi

Too little biomembrane on thefillings/

Qu t vi sinh vt trong b

Reduce the air volume of theblower or increase the refluxquantity of the mixed liquid/Gim lng kh ca cc my

thi hoc tng lng chyngc ca hn hp cht lng

Too thick biomembrane on thefilling/Qu nhiu vi sinh vt bn trongb

Reduce the sewage inputquantity/Gim lng nc thi vo

Flow rate exceeds the designedstandard/Tc chy vt qu tiu

chun thit k

Reduce the flow rate/Gim tc chy

Floating sludgeappears on thesurface of thesedimentation tank/Cc bn cn xuthin trn b mt cab lng ng

Sludge is not promptlydischarged, so sludge digestionoccurs/

Bn cn khng sn sng kpthi x

Timely discharge the sludge/Kip thi x bn

Too much

suspended mattersin effluent from the

Flow rate exceeds the designed

standard/Tc chy vt qu gi tr

Reduce the flow rate/

Gim tc chy



21/21



sedimentation tank/Qu nhiu cht llng chy vo t blng ng

thit k

Poor settleability of thebiomembrane/Ni cc vi sinh vt t

Timely discharge the sludge/

Kp thi x bn

Insufficient aeration/Khng kh vo

The air inlet is blocked byforeign matters/Cc u thi kh vo b tcngn do cc vt cht bn ngoi

Find out the cause from theaerobic tank and make timelyadjusts/Tm nguyn nhn t b k khv kp thi iu chnh

Mixed liquid can notreturn freely/Hn hp cht lngkhng th t chytr v c

Foreign matters in the pipelineor the valve is blocked/

Cc vt cht bn ngoi chyvo bn trong ng ng hoccc van b kha

Clear up the foreign matters/Lm sch cc tp cht ngoi

Sludge can not bedischarged freely/

Bn cn khng tht x i c

Foreign matters in the pipelineor the valve is blocked/Cc vt cht bn ngoi chyvo bn trong ng ng hoccc van b kha

Unscrew the valve, usepressure water to wash out/Ni cc van, s dng nc plc y ra ngoi

Disinfection indexrisesCh s kh trng tyu tng

Disinfectant is used up ordosage is too small/Cc cht kh trng ty u sdng ht hocliu lng qut

Timely supplement thedisinfectant or increase thedosage/

Kp thi b sung cc cht khtrng hoc tng liu lng

The end

ong Nai 4 Hydro powerhouse Nh my thu in ng Nai 4

Sewage Treatment- English Translation-On Monday, The 21st of May, 2012

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Transcript of Sewage Treatment- English Translation-On Monday, The 21st of May, 2012