Inderscience Publishers

Treatment of domestic wastewater using composite ecological system in Chinese rural area

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In this study, a newly developed contaminant removal system for domestic wastewater in rural area was used at the first time in Henan province, China. This composite ecological system (CES) consists of septic tank (ST), improved soil filter (ISF) and surface flow wetland (SFW). The performances of the system was to investigate the removal of biological oxygen demand (BOD), total nitrogen (TN), total phosphorus (TP), total suspend solid (TSS) and total coliform , and to evaluate its technical and economical suitability. The wastewater treatment capacity of the constructing system is 200 m
3
d
–1
. The results show that the average removal values of the combined system which has been observed in a 14-month period are as follows: BOD = 90%, TN = 83%, TP = 98% and TSS = 93%. The intermittent result of the removal total bacterial count and total coliform are 2.1 to 2.6 log unit and the dissolved oxygen increases from 0.8 to 3.5 mg l
–1
. The facts indicate that the system is a cost-effective and technically feasible process for rural area domestic sewage treatment.

Keywords: domestic wastewater, composite ecological system, improved soil filter, ISF, surface flow wetland, SFW

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