本文關(guān)鍵詞：城市污水處理廠化學(xué)強(qiáng)化生物除磷的試驗(yàn)研究，由筆耕文化傳播整理發(fā)布。

中國(guó)環(huán)境科學(xué) 2014,34(12)：3070~3077 China Environmental Science

城市污水處理廠化學(xué)強(qiáng)化生物除磷的試驗(yàn)研究

李子富1*,云玉攀1,曾 灝2,周曉琴1 (1.北京科技大學(xué)土木與環(huán)境工程學(xué)院,北京 100083；2.北京市懷柔區(qū)環(huán)境保護(hù)局,北京 101400)

摘要：為有效解決北京某城市污水處理廠出水總磷含量較高的實(shí)際問(wèn)題,通過(guò)在生物處理工藝(A2O)后端添加化學(xué)除磷強(qiáng)化單元的方法,依次開(kāi)展了實(shí)驗(yàn)室試驗(yàn)和現(xiàn)場(chǎng)的生產(chǎn)性試驗(yàn).實(shí)驗(yàn)室試驗(yàn)以好氧池出水為試驗(yàn)用水,對(duì)不同濃度梯度的聚合氯化鋁(PAC)、聚合硫酸鐵(PFS)、三氯化鐵(FeCl3)等除磷效果進(jìn)行了對(duì)比研究,并分別對(duì)其除磷機(jī)理進(jìn)行了深入的探討.試驗(yàn)結(jié)果表明:3種藥劑中,PAC除磷效果最好,當(dāng)其投加量為60mg/L,投加系數(shù)β為4.15時(shí),出水總磷含量可小于0.5mg/L,而且藥劑投加成本較低,僅為0.078元/t.現(xiàn)場(chǎng)生產(chǎn)性試驗(yàn)選取好氧池出水端為藥劑投加點(diǎn),對(duì)PAC的除磷效果進(jìn)行現(xiàn)場(chǎng)驗(yàn)證.經(jīng)試驗(yàn)測(cè)定,當(dāng)PAC投加量為60mg/L,投加系數(shù)β為4.22時(shí),污水處理廠出水總磷含量遠(yuǎn)低于0.5mg/L,符合排放要求.考慮到進(jìn)水量和負(fù)荷的波動(dòng),在保證出水達(dá)標(biāo)排放的前提下,為保證藥劑的有效利用,通過(guò)采取針對(duì)性措施提高前端生物除磷效率及反饋投加藥劑的方法,以有效減少藥劑的投加量及化學(xué)污泥的排放量,達(dá)到節(jié)能減排的目的. 關(guān)鍵詞：污水處理；化學(xué)強(qiáng)化除磷；混凝劑投加

中圖分類(lèi)號(hào)：X703.1 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1000-6923(2014)12-3070-08

Experimental study on chemically enhanced biological phosphorus removal for municipal wastewater treatment plant. LI Zi-fu1*, YUN Yu-pan1, ZENG Hao2, ZHOU Xiao-qin1 (1.School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China；2.Huairou District of Beijing Environmental Protection Bureau, Beijing 101400, China). China Environmental Science, 2014,34(12)：3070~3077

Abstract：In order to deal with the problem that the high total phosphorus (TP) concentration of effluent from one municipal wastewater treatment plant in Beijing,using the biological process(A2O) followed with chemical phosphorus removal process,laboratory tests and technical scale experiments were conducted in order. The aerobic tank effluent was sampled for evaluating the phosphorus removal efficiency of PAC, PFS, FeCl3 respectively, and the phosphorus removal mechanisms of the three reagents were further discussed. Phosphorus removal efficiency of PAC was the best among three coagulants. The TP concentration of effluent could be lower than 0.5mg/L and the coagulant cost was 0.078Yuan/t with the dosage of 60mg/L and the coefficient β of 4.15. The aerobic tank outlet was selected to be the dosing position for the technical scale experiments. Results showed that demand in phosphorus removal efficiency could be met with a PAC dosage of 60mg/L and coefficient β of 4.15. Considering the water quality and loading fluctuation, in order to ensure TP concentration of effluent discharged lower than 0.5mg/L, a detailed optimization scheme was proposed, through taking effective measures of improving the biological phosphorus removal and dosing the coagulants with feedback control methods to decrease the dosage amount of PAC,therefore reduced the operation cost and chemical sludge amount. Key words：wastewater treatment；chemically enhanced biological phosphorus removal；coagulant dosage

目前,城市污水處理廠所采用的除磷技術(shù)主要有生物除磷和化學(xué)除磷兩種.生物除磷是在好氧條件下,通過(guò)微生物對(duì)污染水體中的溶解性磷酸鹽過(guò)量吸收來(lái)完成.化學(xué)除磷則是向水體中加入化學(xué)藥劑,通過(guò)其與水體中的磷酸鹽反應(yīng)來(lái)達(dá)到除磷目的[1].相比較而言,生物除磷更易受處理系統(tǒng)的BOD負(fù)荷、進(jìn)水COD/TP、厭氧與好氧

-段的DO比、泥齡、厭氧段的NO3濃度等諸多

因素的影響[2],除磷穩(wěn)定性差;化學(xué)除磷則受進(jìn)水水質(zhì)的影響較小,除磷效果穩(wěn)定.

隨著我國(guó)對(duì)水污染問(wèn)題的重視,對(duì)污水排放的要求勢(shì)必會(huì)提高(TP≤0.5mg/L),單純的生物處理工藝將很難達(dá)到要求.因此,將化學(xué)除磷和生物除磷有效結(jié)合就形成了一種運(yùn)行簡(jiǎn)便、經(jīng)濟(jì)有效

收稿日期：2014-03-31

* 責(zé)任作者, 教授, zifulee@

  本文關(guān)鍵詞：城市污水處理廠化學(xué)強(qiáng)化生物除磷的試驗(yàn)研究，，由筆耕文化傳播整理發(fā)布。