農(nóng)村生活污水; 立式A²O一體化工藝; 脫氮除磷; 喀斯特地區(qū)

某鄉(xiāng)鎮(zhèn)污水廠設(shè)計規(guī)模為1 000 m³/d，采用立式A²O工藝，將厭氧、缺氧、好氧、沉淀等工藝合為一體，并且無需混合液回流泵，污泥也可以通過重力作用自然回流。經(jīng)過9個月的現(xiàn)場連續(xù)運行監(jiān)測，得到該污水處理裝置對COD、NH₄⁺ - N、TN、TP的平均去除率分別為78.39%、88.36%、80.16%、72.75%，出水水質(zhì)可穩(wěn)定達到《城鎮(zhèn)污水處理廠污染物排放標(biāo)準(zhǔn)》(GB 18918—2002)的 一級A標(biāo)準(zhǔn)。該一體化反應(yīng)器結(jié)構(gòu)緊湊、操作方便、出水水質(zhì)優(yōu)良，適用于廣大農(nóng)村鄉(xiāng)鎮(zhèn)生活污水的集中式處理。

Vertical A²/O technology was applied in a rural sewage treatment plant with the designed capacity of 1 000 m³/d. The device integrated anaerobic treatment, anoxic treatment, aerobic treatment, precipitation and other processes. There was no mixed liquid reflux pump in the integrated device, and sludge returned naturally through gravity. The newly integrated bioreactor system was operated successfully for 9 months with good performance and high removal efficiency of pollutants. The average removal efficiencies of COD, NH₄⁺ - N, TN, and TP were 78.39%, 88.36%, 80.16% and 72.75%, respectively. The quality of the effluent could meet the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). The newly integrated bioreactor had compacted structure, convenient operation and satisfactory effluent quality, which was suitable for the treatment of rural domestic sewage.