淹没式附着生长生物反应器在废水处理中的应用

Treatment of synthetic detergent wastewater with submerged attached-growth bioreactors(SAGB)

采用淹没式水解 -好氧附着生长生物反应器 (SAGB)技术对直链烷基苯磺酸钠 (LAS)质量浓度高达10 0mg/L的合成洗涤剂生产废水进行处理 ,水解SAGB池的水力停留时间为 4 0h ,好氧SAGB池水力停留时间为 6 0h .研究结果表明 :水解段污泥龄较长的微生物对LAS的起泡组分有较强的降解作用 ,将LAS转化为易生物降解的小分子中间产物 ,使废水的BOD/COD值由 0 2 5提高到约 0 4 5 ,改善了废水的可生化性 ,有利于后续好氧处理 .工程运行表明 :合成洗涤剂废水 ρ(CODCr) =30 1～ 4 5 3mg/L ,ρ(LAS) =12 9～ 16 4mg/L ,ρ(PO43 -) (以P计 ) =2 3～ 4 2mg/L ,采用物化预处理—水解SAGB—好氧SAGB工艺处理后 ,出水水质达到ρ(CODCr) =5 0～ 81mg/L ,ρ(LAS) =2～ 4mg/L ,ρ(PO43 -) (以P计 ) =0 1～ 0 3mg/L 。

LAS concentration is high in synthetic detergent producing wastewater, and it is difficult to be degraded biologically,since LAS causes a lot of foams. Submerged attached growth bioreactor (SAGB) has some advantages such as simple process,high biological treatment efficiency,long solids retention time,and tolerance to high loading,etc. SAGB process with hydrolysis acidogensis and aeration is used to treat LAS rich (100 mg/L) wastewater. The hydraulic retention time of hydrolysis acidogensis SAGB and aerobic SAGB are 4 0 and 6 0 hrs, respectively. In the hydrolysis and acidogensis using heterotrophic microorganisms with longer sludge retention time, LAS and other higher molecular weight organic matters are converted into lower molecular weight compounds, which are readily degraded in the subsequent aerobic stage due to the increase in BOD/COD from 0 25 to 0 45. After physic chemical and biological treatment, the concentrations of COD Cr 301～453 mg/L,LAS 129～164 mg/L,PO 4 3- (P) 2 3～4 2 mg/L, are reduced to COD Cr 50～81 mg/L,LAS 2～4 mg/L,PO 4 3- (P) 0 1～0 3 mg/L, respectively, in the effluent,which meets the national effluent discharge standards.