Novel fluidization technical principle and application case for biotreatment of livestock wastewater
养殖污水生物处理的新型流态化技术原理及其应用案例

The livestock sewage with high concentration of COD,NH+4-N,SS and great odor was studied.According to the defects exists in general bio-reactors such as short sludge retention time(SRT),limited resistance capacity,inconsistent removal of carbon and nitrogen and high investment operating cost,the jet loop anaerobic and air-lift loop aerobic fluidized bed with the features of fortified mass-transfer and mixing were developed for the treatment of livestock wastewater.A biological combined process of A/O2 assisted by pretreatment and post treatment was constructed,which was operated at a treatment scale of 216 m3/d and the engineering effect was evaluated by 6 months continuous operation data.The results showed that under the operation load of A,O1 and O2 at 6,6 and 0.5 kg COD/(m3·d),the COD,BOD5,NH+4-N and SS reduced from 11 000~13 000 mg/L,5 500~6 500 mg/L,560~640 mg/L,7 000~9 000 mg/L to 56.8~59.2 mg/L,4.7~4.9 mg/L,8.6~9.5 mg/L,37.0~39.4 mg/L,respectively.All the effluent indexes met the first grade standards of Water Pollution Discharge Limits(DB4426-2001) in Guangdong Province(primary standard of the second period).The developed process achieves obvious engineering effectiveness and exhibits popularization and application value.