Bench-Scale Study of an ASBBR Combined with Post Ecological Pond for Small-Sized Domestic Sewage Treatment

Water pollution in rural areas or small cities has been a key environmental problem in China. Limited by underdeveloped economy and poor technical capacity, cost- effective and easily operable treatment technologies are highly needed at present, especially for China's western small mountain cities and/or rural areas. An Anaerobic Sequencing Batch Biofilm Reactor (ASBBR) was developed and a bench-scale study on its performance was conducted for domestic sewage treatment. The impacts of start-up of reactor, biofilm density and organic loadings on the performance are investigated. The results show that: 1) concentration of seeding sludge has no significant effects on the ASBBR start-up; 2) under the operation condition of 25degC temperature, 70% biofilm density, 24 hrs HRT and 0.16 kgCOD/ (m
³
ldrd) organic loading rate, the effluent COD can be treated to 116 mg/L with a removal efficiency of 64%, which is compliant with the third class effluent standard for municipal wastewater treatment plant (GB18918-2002) of China.