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摘要:序批式生物膜濾池(SBBF)是基于序批式生物膜法的改進污水處理新型工藝,針對SBBF處理城市污水的除磷的效果較差的弊端,通過直接投加FeSO4 7H2O到反應體系實現協同除磷,使得該工藝能夠較好地應用于污水脫氮除磷。Fe(Ⅱ)的投加量從0.03~0.3 mM進行協同除磷試驗,結果表明0.2 mM的Fe(Ⅱ)投加可為有效投加量。進一步將0.2 mM的Fe(Ⅱ)在進水階段后投加到反應體系,穩定運行1個月,發現出水的TP穩定保持在0.5 mg/L以下,而COD和氮的去除基本不受影響。COD、NH+4-N、TN和TP的平均去除率分別為84.9%、83.2%、46.3%和88.2%。反應器出水的各項指標均穩定達到《城鎮污水處理廠污染物排放標準》(GB 18918—2002)的一級A排放標準。
關鍵詞:序批式生物膜濾池;協同除磷;混凝劑;城市污水
中圖分類號:X703
文獻標志碼:A 文章編號:1674-4764(2016)03-0053-05
Abstract: A sequencing batch biofilm filter was a novel technology based on SBBR. As the sequencing batch biofilm filter was not efficient for phosphorus removal in the treatment of domestic sewage, FeSO4 7H2O was added to the SBBF in order to achieve chemical aided biological phosphorus removal, which was meaningful for nitrogen and phosphorus removal in wastewater treatment. When concentrations of Fe(Ⅱ)varied from 0.03 to 0.3 mM, it indicated that 0.2 mM Fe(Ⅱ) might be a proper dosage. When 0.2 mM Fe(Ⅱ)was added to the bioreactor at the end of influent phase for one month, the effluent TP remained stable at below 0.5 mg/L, and the removal of COD and nitrogen were not affected. The average removal efficiencies of COD、NH+4-N、TN and TP were 84.9%、83.2%、46.3% and 88.2%, respectively. The parameters of reactor effluent were stable to achieve the A standard “discharge standard of pollutants for municipal wastewater treatment plant (GB 18918—2002)”.
Keywords:sequencing batch biofilm filter; chemical aided biological phosphorus removal; coagulant; domestic sewage
序批式生物膜濾池(sequencing batch biofilm filter)是序批式生物膜法和生物濾池的有效結合,通過接觸氧化和過濾作用從而達到去除污染物的目的[1-2]。之前的研究表明[3],序批式生物膜濾池通過同步硝化反硝化作用脫氮的效果較好, 由于大量的異養微生物的生長代謝可獲得較高的有機物的去除率。但是SBBF通過反硝化除磷作用和反沖洗過程排泥而達到除磷的效果,出水的TP的濃度基本上達不到《城鎮污水處理廠污染物排放標準》(GB 18918—2002)中一級A標準的要求[1-2, 4]。膜法除磷主要是依靠生物膜的脫落,然后排放到反應系統外來達到除磷目的[5],較長的SRT也不利于生物除磷。
化學除磷是利用化學藥劑將水中溶解性的磷變為非溶解性的磷,而化學協同除磷是將化學混凝劑直接投加在生物反應池中[6],使溶解性有機磷由水中析出而沉淀或過濾分離[7],是一種簡單有效的強化除磷的方法。……