WP-B: Development and Testing of a GIS-Based Planning Tool for Creating Decentralized Sanitation Scenarios
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In Chinese peri-urban and rural areas with low population density, the implementation of central wastewater infrastructure and management concepts is difficult, mainly because of high investment costs and inadequate operation and maintenance concepts. However, these areas strongly contribute to precarious environmental situations of which Chao Lake is a perfect illustration. In the lake catchment three primary diffuse sources of pollution have been identified: (1) indirect discharges of untreated or inadequately treated domestic wastewater, (2) pollution from livestock production, (3) agricultural runoff and groundwater passage. In 2011, these primary nonpoint sources caused 42% of organic (COD) inflows to the lake, 38% of TN, and 42% of TP (Asian Development Bank, ADB 2015). To improve water quality in Chao Lake, investment in wastewater management is likely to be the easiest action as it also helps to improve the quality of the local inhabitants. However, defining and implementing cost-efficient investment plans is difficult and requires enlighted decisions.
KeywordsChao Lake Decentralized Wastewater Management Pressure Sewers On-site Systems Chaohu City
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