以养殖固体废弃物发酵产物为碳源的SND系统的脱氮除磷效果

在连续低曝气的SBR装置中,采用人工模拟养殖废水培养成熟脱氮除磷污泥,研究了养殖固体废弃物发酵产物为碳源的养殖废水脱氮除磷效果。结果表明:在水力停留时间(HRT)为12 h,溶氧在0.04~1.5 mg/L之间,污泥经过25 d的驯化培养,反应器中形成了具有较高活性的同步硝化反硝化能力的污泥,以养殖固体废弃物发酵产物为碳源处理养殖废水,反应器中的COD、NO3--N和NH4+-N最大去除率分别能达到97.87%、94.95%和88.90%,且NO2--N完全不发生累积,其中C/N=7.35,即50 g湿重的养殖固体废弃物与2 L的养殖废水配比最佳,脱氮除磷效果最好,对TN的去除率在87%左右,能够较好完成同步脱氮除磷实现养殖固体废弃物的资源化利用,为循环水养殖系统零排放提供技术参考。

Nitrogen and phosphorus removal by simultaneous nitrification and denitrification using fermented aquaculture solid waste products as carbon source

In the continuous low aeration SBR reactor,nitrogen and phosphorus in aquaculture wastewater were simultaneously removed by active sludge.The carbon source in the reactor was fermented aquaculture solid waste products.Results showed that with the hydraulic retention time of 12 h,DO concentrations between 0.04~1.5 mg/L,highly active sludge was formed after 25 d and the removal efficiencies of COD,NO3--N,NH4+-N were 97.87%,94.95% and 88.90%,respectively.No NO2--N was accumulated in the process.When the C/N was 7.35,namely 50 g (wet weight) solid waste in 2 L aquaculture wastewater,nitrogen and phosphorus were most efficiently removed and the N removal efficiency was about 87%.The active sludge was proved to be very efficienct for simultaneous nitrification and denitrification using fermented aquaculture solid waste products as carbon sources.The study provided another way of resource reutilization and is a good technical reference to obtain zero discharge in recirulating aquaculture system.