固定化硝化菌去除废水中氨氮工艺的研究

采用聚乙烯醇－硼酸包埋固定化法，选用ＰＶＡ为包埋载体，粉末活性炭作为无机载体，包埋固定Ａ／Ｏ生物脱氮系统中的再经驯化过的硝化污泥，制成固定化硝化菌颗粒。

Study on The Process of Removing Nitrogen from Wastewater Using Immobilized Nitrobacteria

The immobilized microbes pellets were made from entrapping cultivated nitrifying activated sludge using polyvinyl alcohol(PVA)crosslinked with boric acid,PVA is entrapment carrier and powdered activated carbon is inorganic carrier.The source of nitrifying activated sludge come from A/O system.In biological fluidized bed reactor(BFBR),Sequencing Batch Reactors (SBR) system treating composed NH₄-N wastewater was carried out.The experiment results were as follows:the immobilized nitrobacteria's life was more than seven months;the oxygen using rate(OUR)recovered from 10.3mg/(L·h) to 420mg/(L·h);the NH₄-N removal loading could reach 240 mg/(L·h).While the immobilized nitrobacteria pellets package percentage was 4%,influent NH₄-N concentration was 35 mg/L,reaction time was 5h,the NH₄-N removal efficiency reach 99%;influent NH₄-N concentration was about 65 mg/L,reaction time was 9h,the NH₄-N removal efficiency also reach 99%.When the influent COD is about 230 mg/L,NH₄-N is about 35mg/L,reaction time was 4h,the COD removal efficiency could reach 80%,the NH₄-N removal efficiency always kept 90% or so.In this research,the situation of microbe growth and distribution of immobilized nitrobacteria was observed with scanning electron microscope.