Energy survey of the Brimsu Water Supply Station

ENERGY SURVEY OF THE BRIMSU

WATER SUPPLY STATION – GHANA

WATER COMPANY LIMITED

(GWCL – CAPE COAST)

Amengor, Jacob Kwasi

SUPERVISOR: Mr. Oteng Peprah, Michael

PROBLEM STATEMENT

•Rationing of water in the Cape Coast Municipality

•Limited capacity of treatment plants

•Demand exceeding supply within the municipality

02-June-14ENERGY SURVEY OF THE BRIMSU WATER SUPPLY STATION –GHANA WATER COMPANY LIMITED (GWCL – CAPE COAST)

PROJECT OBJECTIVES

• The objectives of this study are:

To determine the energy loss in the treatment process.

To determine the energy consumption in producing water.

To make recommendations for the saving of energy in the head works.


METHODOLOGY

The audit was carried out by using the

following steps:

•Embarking on field investigation.

•Gathering of operating data.

•Processing of data and evaluation.


RESULTS

The outcome of the survey is as follows;

• There was always a decrease in the volume of raw water after treatment

process. The quantity of water loss during the treatment led to a

corresponding energy loss.


CONT’DMONTH RAW WATER FINAL WATER WATER LOSS ACTUAL POWER POWER LOSS PERCENTAGE OF

POWER LOSS

m^3 m^3 m^3 kWh kWh %

JANUARY 571440 531930 39510 215177 14877.58 6.91

FEBRUARY 479853 449552 30301 221528 13988.70 6.31

MARCH 533327 503955 29372 239827 13208.03 5.51

APRIL 484854 451775 33079 155510 10609.62 6.82

MAY 434353 407030 27323 144105 9064.93 6.29

JUNE 665221 627565 37656 246421 13949.09 5.66

JULY 674029 625640 48389 249647 17922.33 7.18

AUGUST 680516 630113 50403 255570 18929.01 7.41

SEPTEMBER 643440 595780 47660 260034 19260.88 7.41

OCTOBER 670868 621175 49693 269362 19952.37 7.41

NOVEMBER 664872 615773 49099 256480 18940.35 7.38

DECEMBER 659198 610075 49123 256480 19112.72 7.45

TOTAL 1230638 1142005 88633 471657 33969.68 7.20


CONT’D

• The electrical energy consumed during the production of a cubic

meter of water was found to be within the acceptable limit based on

the range 1.0 – 2.5kWh/ 1000 gallons of water produced. The average

electrical consumption for the year 2013 was 1.57kWh/1000 gallons of

water.


CONT’D


0 50000 100000 150000 200000 250000 300000 350000

JANUARY

FEBRUARY

MARCH

APRIL

MAY

JUNE

JULY

AUGUST

SEPTEMBER

OCTOBER

NOVEMBER

DECEMBER

kWh

MO

NTH

COMPARISON OF THE ACTUAL AND THEORITICAL POWER CONSUMPTION IN kWh

ACTUAL POWER THEORITICAL POWER

CONT’D

• The water produced by the Brimsu Head works was not sufficient to

satisfy the water demand of the supply area. The water produced by

the Head works, on the average, served only 68.70% of the total

water demand leaving a deficit of 31.30%.


CONT’D


17159

16055 16257

15060

13130

20919

16997

2032619859 20038

2052519680

26,201 26,201 26,201 26,201 26,201 26,201 26,201 26,201 26,201 26,201 26,201 26,201

0

5000

10000

15000

20000

25000

30000

JANUARY FEBRUARY MARCH APRIL MAY JUNE JULY AUGUST SEPTEMBER OCTOBER NOVEMBER DECEMBER

GRAPHICAL REPRESENTATION OF DAILY WATER DEMAND AND PRODUCTION

AVERAGE PRODUCTION/DAY m^3 AVERAGE WATER DEMAND/DAY m^3

CONT’D

• The electricity cost was found to be the major cost in the production of water at

the Brimsu Head works. The increase in energy consumption led to increment in

the electricity cost and a subsequent increment in the production cost.

• The average production cost of the Brimsu Head works was GHS 0.31 per cubic

meter of water.


CONT’D

MONTH TOTAL PRODUCTION

COST PER m^3

ELECTRICITY COST/m^3 PERCENTAGE OF ELECTRICITY COST FINAL WATER

GHS GHS % m^3

JANUARY 0.27 0.11 40.7 531930

FEBRUARY 0.28 0.11 39.3 449552

MARCH 0.27 0.11 40.7 503955

APRIL 0.28 0.10 35.7 451775

MAY 0.30 0.10 33.3 407030

JUNE 0.29 0.11 37.9 627565

JULY 0.32 0.11 34.4 625640

AUGUST 0.31 0.11 35.5 630113

SEPTEMBER 0.31 0.12 38.7 595780

OCTOBER 0.36 0.20 55.6 621175

NOVEMBER 0.37 0.20 54.1 615773

DECEMBER 0.37 0.20 54.1 610075


RECOMMENDATION

From the results of the study it is recommended that,

• Leakages found in the treatment plant and leaks in the pumps should be

repaired in order to reduce the water loss.

• Backwashing should be carried out properly so that the rate at which the

filter media gets clogged is reduced.


CONT’D

• Recycling of sludge is highly recommended. The recycled water can be used for

backwashing several times, which saves water and energy as well.

• Variable Frequency Drives should be installed in the pumping system. The VFDs

control flow and/or pressure of pumps. Their ability to match flow with demand

leads to significant energy savings.


CONT’D

• Pump efficiency checks need to be performed regularly. This helps to determine when

maintenance works should be carried out. The greater the overall efficiency of the pump

the lower the energy consumed.

• The necessary measuring instruments needed for pump efficiency tests should be

provided. Instruments such as flow meters and pressure gauges should be installed with

each of the pumps.


THANK YOU


Energy survey of the Brimsu Water Supply Station

Engineering

Transcript of Energy survey of the Brimsu Water Supply Station