發(fā)布時(shí)間：2018-07-27 11:42

【摘要】：我國水污染問題日趨嚴(yán)重,水資源短缺己經(jīng)影響到生態(tài)環(huán)境和人類健康,污水排放標(biāo)準(zhǔn)也日趨嚴(yán)格�；诋�(dāng)前情況,對污水處理廠進(jìn)行提標(biāo)改造,成為城鎮(zhèn)污水處理行業(yè)迫在眉睫、亟待解決的關(guān)鍵技術(shù)難題。本研究依據(jù)天津某污水處理廠的進(jìn)水水質(zhì),以天津市《城鎮(zhèn)污水處理廠水污染物排放標(biāo)準(zhǔn)》(DB12599-2015)的A級標(biāo)準(zhǔn)進(jìn)行設(shè)計(jì),選擇多級AO與MBR組合工藝進(jìn)行試驗(yàn)研究。通過對MAO-MBR工藝的中試設(shè)備進(jìn)行調(diào)試和優(yōu)化試驗(yàn),系統(tǒng)研究組合工藝的特點(diǎn)和優(yōu)勢,優(yōu)選合理的參數(shù)取值范圍,并研究工藝對水中污染物的去除情況和低溫下的運(yùn)行情況。研究結(jié)果:在低溫(7-13℃)下,經(jīng)MAO-MBR組合工藝處理后,出水COD、NH3-N、TN、TP 平均濃度 24.45mg/L、0.85mg/L、6.00mg/L、0.10mg/L,平均去除率分別為97%、98%、86%、98%,均達(dá)到天津市《城鎮(zhèn)污水處理廠水污染物排放標(biāo)準(zhǔn)》(DB12599-2015)A級標(biāo)準(zhǔn)。系統(tǒng)對進(jìn)水水質(zhì)在一定范圍內(nèi)體現(xiàn)出較強(qiáng)的抗沖擊負(fù)荷能力。通過對HRT、DO、R、SRT和膜池曝氣量等因素研究可以得出,當(dāng)HRT為12.5h時(shí),對各項(xiàng)污染物處理效果較好;DO1mg/L時(shí),對NH3-N和TN的去除率低,當(dāng)DO2mg/L時(shí),影響對有機(jī)物的消解,影響出水COD。在污泥回流比R為50%、75%、100%、150%四種工況下運(yùn)行時(shí),對TN的去除率逐漸增加。在四級多點(diǎn)進(jìn)水的設(shè)計(jì)條件下,50%的回流比即可滿足出水要求。SRT對TP去除效果影響最大,在SRT=12d時(shí)去除率為97.8%,當(dāng)SRT40d時(shí),對TP的去除率下降,當(dāng)SRT=100d時(shí),污泥老化,對COD、NH3-N和TN去除率也出現(xiàn)降低趨勢。膜池曝氣量為30m3/h時(shí),跨膜壓差的增加速率為0.8KPa/d,緩解了膜污染,又保證對TP的去除。對組合工藝MAO-MBR中沿程的變化進(jìn)行研究得出,MLSS沿程逐漸減低,存在濃度梯度;COD、NH3-N、TN、TP的消耗主要發(fā)生在前兩級,承擔(dān)了大部分的去除。COD對TN的影響情況,當(dāng)COD400mg/L時(shí),系統(tǒng)的脫氮效果良好,去除率達(dá)到85%以上。當(dāng)COD低于400mg/L時(shí),出水TN在10mg/L左右,去除率降低。從10℃到18℃,組合工藝的硝化速率增加了 25%。與生化部分相比,組合工藝的硝化速率明顯較高,溫度為10℃時(shí),從0.016kgNH3-N/(kgMLSS·d)增加到0.019kgNH3-N/(kgMLSS·d)。MAO-MBR工藝是一種節(jié)能、高效和穩(wěn)定的污水處理工藝,可運(yùn)用到升級改造的實(shí)際工程中,提高出水水質(zhì)。
[Abstract]:The problem of water pollution is becoming more and more serious in China. The shortage of water resources has affected the ecological environment and human health. Based on the current situation, upgrading the standard of sewage treatment plant has become an urgent and urgent technical problem in urban sewage treatment industry. According to the influent water quality of a wastewater treatment plant in Tianjin and the A class standard of Tianjin Municipal sewage treatment Plant Water Pollutant discharge Standard (DB12599-2015), the multistage AO and MBR combined process was selected for experimental study. By debugging and optimizing the pilot plant of MAO-MBR process, this paper systematically studies the characteristics and advantages of the combined process, optimizes the range of parameters, and studies the removal of pollutants in water and the operation at low temperature. The results showed that at low temperature (7-13 鈩，

本文編號(hào)：2147711