How to treat domestic wastewater
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1 How to treat domestic wastewater Challenges in Applications of Integrated Water Resources Management Water and Environment Centre March 2010 Frans P. Huibers Irrigation and Water Engineering Group
2 How to treat wastewater? means How to handle wastewater How to deal with wastewater and not Which treatment plant to construct
3 Urban population in Hyderabad (India)
4 Hyderabad +40 Km Picture: IWMI
5 Increasing wastewater flows in Sana a Expected increase over a period of 25 years: Population growth (3%) > x 2 Urbanisation (3%) > x 2 Economic development > x? What happened and will happen to Sana a and other Yemeni cities??? Last 25 years Coming 25 years
6 3 Approaches to treat wastewater Discharge into natural waters or sinks Leads to environmental pollution and economic damage at medium and long-term Construct WWTPs at secondary or advanced level Leads to environmental protection, but at high costs Agricultural use after partial (natural) treatment Immediate benefits, reduces environmental pollution
7 Country Wastewater use Renewable water resources (Mm 3 /day/million) (m 3 /cap/yr) Yemen Morocco China Egypt Jordan Tunisia Syria Mexico Israel Qatar
8 Prospects of wastewater use Wastewater is a reliable water source, replacing the use of fresh water resources (closing basins) Nutrients in wastewater may (partly) replace chemical fertilizers (recycling) Irrigation with wastewater is a treatment step (environmental protection) Many (poor) farmers depend on wastewater (livelihood)
9 Wastewater use (from safe to risky) Groundwater recharge Landscaping, incl. golf courses Industrial crops Fodder crops Food crops Processed before consumption Tree crops Raw consumed vegetables
10 Risks of using domestic wastewater Farmers: worms) helminth eggs (parasitic pathogenic bacteria skin infections Consumers: helminth eggs pathogenic bacteria Environment: nutrient uploading salinisation/sodification (groundwater - surface water - soil)
11 The wastewater chain Household water Wastewater Treatment Farmer s field Environment Drainage Produce Consumer
12 Upstream issues (collection and treatment) Separate domestic and industrial flows Collect wastewater in a sewerage system Transport to location where effluent can be used Favour a decentralised approach where feasible
13 Create storage in irrigation scheme Link between treatment and agricultural use Stores effluent in excess of irrigation water use (operational; seasonal) Is a source of irrigation water in periods of high water demand Acts as buffer in case of calamities Can act as additional treatment
14 Different Crops and Irrigation Techniques
15 Crop handling: Contamination risks Photo: J Evers
16 Food chain: Market handling
17 Log 10 pathogen reduction QMRA with log 10 reduction 10 Drip Irrigation 9 log unit pathogen reduction for several health protection measure Constructed wetland 8 Sum of measures has to reach 6-7 log reduction to achieve 10-6 DALY Product washing (Disability Adjusted Life Years) per person per year 7 Product cooking WHO, 2006 guidelines for wastewater use in agriculture 6 Product peeling Pathogen die-off 5 Sprinkler 4 Furrow 3 Chlorination 2 Membrane treatment Pond treatment 1 0 A B C D E F G on farm management crop restrictions treatment Slide courtesy Wolf
18 The reverse design approach Effluent quality fixed by the required water characteristics in downstream irrigation (negotiable) The location of the treatment plant in relation to the agricultural field and additional fresh water resources Decentralization in view of cost reduction and the exclusion of toxic waste streams in the sewerage The lay-out of the water distribution system, incl. the construction of irrigation water storage basins
19 Research challenges Technological: Design criteria for treatment plants serving agriculture How to make irrigated agriculture a treatment step Environmental: How to control health risks for farmers and consumers What are long term effects on soil, surface- and groundwater Socio-economic: Develop policies to properly involve stakeholders How to create required knowledge and acceptance with farmers and consumers
20 Aim: Make wastewater a resource!
21 To you it s Shit. To us it is BREAD AND BUTTER Shit Business is Serious Business
22 Thank You Wageningen UR
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