USE OF THE SOUTH AFRICAN NATIONAL WATER ACT, 1998 (ACT 36 OF 1998) TO REGULATE PACKAGE PLANTS
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Transcript of USE OF THE SOUTH AFRICAN NATIONAL WATER ACT, 1998 (ACT 36 OF 1998) TO REGULATE PACKAGE PLANTS
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USE OF THE SOUTH AFRICAN NATIONAL WATER ACT, 1998 (ACT
36 OF 1998) TO REGULATE PACKAGE PLANTS
Department of Water Affairs and Forestry
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Incr
easi
ng
risk
of
imp
acts Licences
High potential risk
if impact uncontrolled
Must register
General Authorisations
Common use – low risk of impacts
Registration in most cases
Schedule one water use
Widespread use – minimal or no risk of impacts
No registration required
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General Authorisations
Published in Govt Gazette, 26 March 2004
Reviewed every 5 years
Objectives: • authorise water use that exceeds Schedule
One definitions, but does not impact on a water resource or any other persons water use, property or land and exceed the capacity of that resource or the needs of other users
• alleviate burden of issuing licenses to certain minor water users
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Irrigation of wastewater can only take place:
• above the 1:100 floor line of a water resource or alternatively,
• more than 100 metres from the edge of a water resource or a borehole which is utilised for drinking water or stock watering, which ever is further;
• and on land that is not, or does not, overlie a Major Aquifer
General Authorisations – 21 (e) (irrigation of wastewater)
Registration of the water use
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General Authorisations – 21 (e)(irrigation of wastewater)
Wastewater quality requirements for irrigation of up to 2000 m3/per day:
Faecal coliforms ≤1000 per 100 ml
Chemical oxygen demand ≤ 75 mg/l
pH 5.5 – 9.5
Ammonia ≤ 3mg/l
Nitrate/nitrite ≤ 15 mg/l
Chlorine ≤ 0.25 mg/l
Suspended solids ≤ 25mg/l
Orthophosphate ≤ 10 mg/l
Electrical conductivity 70 mS/m above intake to maximum 150 mS/m
Soap, oil & grease ≤ 2.5 mg/l
Fluoride ≤ 1 mg/l
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Monitoring requirements for irrigation with wastewater
• the quantity must be metered and the total recorded weekly
• the quality must be monitored monthly as at the last
day of each month by grab sampling, at the point at which the wastewater enters the irrigation system
• map demarcating the area utilised for irrigation
• details of crops under irrigation
• irrigation management techniques
• management/control of contaminated runoff from the
irrigation area, odour & nuisance control
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General Authorisations – 21 (f)) Discharge to a water resource
"domestic wastewater" means wastewater arising from domestic and commercial activities and premises, and may contain sewage
"domestic wastewater discharge" means a wastewater discharge consisting of 90% or more domestic wastewater, by volume, that is collected, treated and subsequently disposed of
Does not apply to a person who discharges wastewater:
through sea outfalls; to an aquifer; any other groundwater resource; or any water resource with a closed drainage system
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May discharge up to 2000 m3/per day of wastewater to a water resource that is not a listed water resource, provided the General Limit Values (GLV’s) are compiled to.
May discharge up to 2000 m3/per day of wastewater to a water resource that is a listed water resource, provided the Special Limit Values (SLV’s) are compiled to.
General Authorisations – 21 (f)) Discharge to a water resource
Must register the water use with DWAF
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SUBSTANCE/PARAMETER GENERAL LIMIT SPECIAL LIMIT
Faecal Coliforms (per 100 ml) ≤ 1 000 0
Chemical Oxygen Demand (mg/l) ≤ 75 (i) ≤ 30(i)
pH 5,5-9,5 5,5-7,5
Ammonia (ionised and un-ionised) as Nitrogen (mg/l)
≤ 6 ≤ 2
Nitrate/Nitrite as Nitrogen (mg/l) ≤ 15 ≤ 1,5
Chlorine as Free Chlorine (mg/l) ≤ 0,25 0
Suspended Solids (mg/l) ≤ 25 10
Electrical Conductivity (mS/m) 70 mS/m above intake to a maximum of 150 mS/m
50 mS/m above background receiving water, to a maximum of 100 mS/m
Ortho-Phosphate as phosphorous (mg/l) ≤ 10 1 (median) and 2,5 (maximum)
Fluoride (mg/l) ≤ 1 ≤ 1
Soap, oil or grease (mg/l) ≤ 2,5 0
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SUBSTANCE/PARAMETER GENERAL LIMIT SPECIAL LIMIT
Dissolved Arsenic (mg/l) ≤ 0,02 ≤ 0,01
Dissolved Cadmium (mg/l) ≤ 0,005 ≤ 0,001
Dissolved Chromium (VI) (mg/l) ≤ 0,05 ≤ 0,02
Dissolved Copper (mg/l) ≤ 0,01 ≤ 0,002
Dissolved Cyanide (mg/l) ≤ 0,02 ≤ 0,01
Dissolved Iron (mg/l) ≤ 0,3 ≤ 0,3
Dissolved Lead (mg/l) ≤ 0,01 ≤ 0,006
Dissolved Manganese (mg/l) ≤ 0,1 ≤ 0,1
Mercury and its compounds (mg/l) ≤ 0,005 ≤ 0,001
Dissolved Selenium (mg/l) ≤ 0,02 ≤ 0,02
Dissolved Zinc (mg/l) ≤ 0,1 ≤ 0,04
Boron (mg/l) ≤ 1 ≤ 0,5
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Monitoring requirements for discharge of wastewater to a water resource
• the quantity of the discharge must be metered and the total recorded weekly
• details of failures and malfunctions in the discharge system and details of measures taken
• the quality of domestic wastewater discharges must be monitored monthly by grab sampling and analysed for specific substances and parameters as per the table below:
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1 000 to 2 000 cubic metres pH Electrical Conductivity (mS/m)Faecal Coliforms (per 100 ml)Chemical Oxygen Demand (mg/l)Ammonia as Nitrogen (mg/l)Nitrate/Nitrite as Nitrogen (mg/l)Free Chlorine (mg/l)Suspended Solids (mg/l)Ortho-Phosphate as Phosphorous (mg/l)
DISCHARGE VOLUME ON ANY GIVEN DAY
MONITORING REQUIREMENTS
10 to 100 cubic metres pH Electrical Conductivity (mS/m)Faecal Coliforms (per 100 ml)
100 to 1000 cubic metres pH Electrical Conductivity (mS/m)Faecal Coliforms (per 100 ml)Chemical Oxygen Demand (mg/l)Ammonia as Nitrogen (mg/l)Suspended Solids (mg/l)
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Some problems experienced with package plants
• Consistent non-compliance to the General Limit Values (GLV’s) contained in the General Authorisations. Particularly ammonia and E. coli and occasionally COD
• Excessive use of detergents and other cleaning agents
• Operational and maintenance problems
• Monitoring requirements – results not submitted to DWAF regularly
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Translation: Norwegian to English BLONDIN
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