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A Strategy for Improving the Sewerage Systems of Two Rural Areas in Gyeonggi Province  

Moon, Chul-Hwan (Center for Paldang Water Environment, Gyeonggi Research Institute)
Ahn, Ji-Hoon (Center for Paldang Water Environment, Gyeonggi Research Institute)
Jang, Mi-Jeong (Center for Paldang Water Environment, Gyeonggi Research Institute)
Lee, Sang-Hyup (Center for Paldang Water Environment, Gyeonggi Research Institute)
Cho, Young-Moo (Center for Paldang Water Environment, Gyeonggi Research Institute)
Kim, Yun-Je (Center for Paldang Water Environment, Gyeonggi Research Institute)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.6, 2010 , pp. 563-580 More about this Journal
Abstract
In 2009 the Korea Ministry of Environment announced 'A Comprehensive Plan for the Improvement of Sewer Service in Rural Area' aiming at reduction of the sewer service gap between urban and rural areas as well as improvement in the residential environment of the rural area. According to the plan, the sewer system supply rate for the rural area is expected to reach up to 75% until 2015 with the budget of 4.7 trillion won (Korean currency). It is not certain, however, that the increase in the sewer system supply rate will accompany improvement of water quality in receiving water because several veiled problems that can occur in small-scale sewer treatment plants are poorly addressed in the plan. In this study, those issues for the small-scale sewer treatment plants and their solutions were discussed based on a case study in which we investigated 19 treatment facilities at two rural regions in Gyeonggi province. This study also included strategies useful for the plan. From the results of investigation, some problems, e.g., high hourly variations but low in flowrates and low mass loading were commonly identified. Although operation parameters in sewer treatment plants require to be modified depending on the mass loading, most of the plants were operated with the initial design parameters which causes the decrease of removal efficiency. In the intensive diagnosis, we arranged and applied solutions (e.g., flow equalization, air on/off time control, etc) to the two selected plants and found out improvement of effluent water quality, especially organic matters (COD and SS) and T-N with better denitrification performance.
Keywords
Small-scale sewer treatment plant; Technical diagnosis; Sewer system supply rate; Rural area; Water quality;
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