摘要
采用水解-生物陶粒移动床(BCMBBR)-混凝沉淀组合工艺处理南方低浓度、低碳高氨氮生活污水(COD 110～140 mg/L、C/N 4～5),开展中试研究。结果表明,BCMBBR 20 d成功挂膜,快速启动;在水温25～29℃,HRT 8 h,气水比5∶1,混合液回流比150%,无混凝沉淀下运行,COD、SS和NH4+-N的平均去除率均在81%以上,TN平均去除率大于47%,而TP去除率较低;后接PAC+PAM强化混凝沉淀后运行,有效提高了TP去除率,出水TP在0.5 mg/L以下,稳定达到(GB18918-2002)一级A标准。曝气强度不同相应BCMBBR中的微生物相(微生物种类和数量)也不同,可根据微生物相来指导曝气强度的调节,实现BCMBBR的高效运行。该组合工艺处理废水运行的直接成本为0.24元/m3,是一种适合南方低浓度、低碳高氨氮生活污水的经济高效处理工艺。
A hydrolysis-bioceramic moving bed biofllm reactor （BCMBBR）-chemical coagulation combined process was developed for treatment of domestic wastewater with low organic carbon concentration and high am- monia-N levels （COD 110 -140 mg/L, C/N 4 -5） in Dongguan city, China. The results showed that success- ful start-up of the BCMBBR can be achieved in 20 days. Without incorporating chemical coagulation, the BCMB- BR can remove more than 81% of the COD, NH4＋ -N and SS and 47% of the TN with an hydraulic retention time of 8 h, gas-water ratio of 5：1 and mixture reflux ratio of 150%. But TP removal efficiency was low. When chem- ical coagulation （enhanced coagulation based on the addition of PAC and PAM） was incorporated into the BC- MBBR, TP removal was significantly enhanced. The TP concentration in effluent was less than O. 5 mg/L which can meet the first class A discharge standards for phosphorus for municipal wastewater treatment plant of China. Aeration intensity has a direct effect on the microbial diversity in the BCMBBR system which could be a useful indication for regulating aeration intensity and thus, high efficient operation of the BCMBBR can be achieved. The unit operating cost of the hydrolysis-BCMBBR-chemical coagulation combined process was only 0.24 yuan/ m3 which present an economical and effective approach for treatment of low strength domestic wastewater contai- ning low total organic carbon to nitrogen ratios in south of China.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第7期2123-2128,共6页
Chinese Journal of Environmental Engineering
基金
国家"水体污染控制与治理"科技重大专项(2008ZX07211-005)
关键领域重点突破项目招标项目(东莞专项)(200716851)
