A2O設(shè)施處理長三角平原地區(qū)農(nóng)村生活污水的效果
- Title:
- Performance of A2O Facilities for Rural Domestic Sewage Treatment in Yangtze River Delta Plain
- 關(guān)鍵詞:
- font-size: 10pt; ">A font-size: 10pt; "> 2O; 農(nóng)村生活污水; 脫氮除磷; 長三角平原地區(qū)
- Keywords:
- font-size: 10pt; ">anaerobic-anoxic-oxic (A font-size: 10pt; "> 2 O); rural domestic sewage; nitrogen and phosphorus removal; Yangtze River Delta plain
- 摘要:
-
厭氧/缺氧/好氧（A2O）設(shè)施在長三角平原地區(qū)農(nóng)村生活污水處理中應(yīng)用廣泛，此次調(diào)研了5個鎮(zhèn)39個A2O設(shè)施對污染物的去除效果和進(jìn)水量。結(jié)果表明，A2O設(shè)施進(jìn)水COD、氨氮、TN、TP的濃度分別為（95±80）、（56.2±40.0）、（61.6±40.1）、（4.6±2.8） mg/L，部分設(shè)施進(jìn)水濃度較低，說明污水收集有問題。由于進(jìn)水量不穩(wěn)定，A2O設(shè)施受降雨量影響很大，與設(shè)計規(guī)模有較大偏差。A2O設(shè)施對COD、氨氮、TN、TP的去除率分別為(46.9±30.5)%、(46.0±37.3)%、(19.7±18.7)%和(25.1±21.9)%，各設(shè)施之間對污染物的去除情況差別很大，出水COD達(dá)標(biāo)率較高，但氮、磷達(dá)標(biāo)率較低。進(jìn)水COD濃度低引起的有機(jī)負(fù)荷與進(jìn)水COD/TN值偏低、雨污分流不徹底引起的較大水力沖擊負(fù)荷、進(jìn)水水質(zhì)水量波動大、設(shè)施運(yùn)維工作不到位引起的生物脫氮除磷效果不佳，是A2O設(shè)施應(yīng)用效果不理想的重要原因。
- Abstract:
-
Anaerobic-anoxic-oxic (A2O) facilities are widely applied in rural domestic sewage treatment in the Yangtze River Delta plain. Pollutants removal performance and influent flow rate of 39 A2O facilities in five towns were investigated. The influent concentrations of COD, ammonia nitrogen (NH 3 -N),total nitrogen (TN)and total phosphorus (TP) were (95±80) mg/L,(56.2±40.0) mg/L,(61.6±40.1) mg/L and (4.6±2.8) mg/L, respectively. The very low influent concentration in some facilities indicated that there was a problem in sewage collection. Due to the unstable influent flow rate, the A2O facilities were greatly affected by rainfall and deviated from the design capacity.The removal rates of COD, NH3-N, TN and TP by the A2O facilities were (46.9±30.5)%, (46.0±37.3)%, (19.7±18.7)% and (25.1±21.9)%, respectively,and the removal performances varied greatly among facilities. The standard achieving rate of effluent COD was high, but those of effluent nitrogen and phosphorus were low. Important reasons for the poor performance of the facilities were as follows: the too low organic load and influent COD/TN ratio caused by the low concentration of influent COD, high shocking load caused by incomplete diversion of rain and sewage, dramatic fluctuation in quality and quantity of the influent, as well as poor biological removal of nitrogen and phosphorus caused by inadequate operation and maintenance of the facilities.
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