本文關(guān)鍵詞：混凝沉淀—水解酸化—兩級SBR處理養(yǎng)牛廢水　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 混凝沉淀 水解酸化 兩級SBR 養(yǎng)牛廢水 動力學(xué)分析

【摘要】：哈爾濱市某養(yǎng)牛場廢水具有COD濃度高、固體懸浮物量大等特點,屬典型的高濃度有機廢水,本課題以養(yǎng)牛場廢水作為研究對象,旨在確定高效低能的處理工藝及其相關(guān)參數(shù)。針對養(yǎng)牛場廢水的處理方法多為厭氧+好氧處理而未加水解酸化,雖然養(yǎng)牛廢水可生化性很好,但是由于COD濃度過高導(dǎo)致出水效果不是很好,而水解酸化可以有效的提高廢水的可生化性,使出水COD降低。通過大量閱讀中外文獻,本課題采用混凝沉淀-水解酸化-兩級SBR工藝處理養(yǎng)牛場廢水。該工藝具有啟動周期短,運行靈活,其水解酸化單元可以有效提高廢水的可生化性,SBR工藝能適宜廢水水量和水質(zhì)的變化,使得該處理系統(tǒng)具有較強的抗沖擊負荷能力。本研究通過對Fe Cl3、PAC、Al2(SO4)3三種混凝劑處理養(yǎng)牛廢水進行了實驗,結(jié)果發(fā)現(xiàn)Fe Cl3對該廢水的處理效果最好。投加量為4ml/L,沉淀時間20min,慢速攪拌時間10min時,COD的平均去除率為53.95%,SS的去除率平均值為62.74%。水解酸化反應(yīng)器經(jīng)過30天左右的啟動馴化后處理效果穩(wěn)定。通過對各指標(biāo)隨HRT的變化,發(fā)現(xiàn)COD和SS的去除率隨著HRT的延長逐漸上升,到HRT=16h時,趨于穩(wěn)定。系統(tǒng)出水的COD去除率為32.14%,SS在12h去除率為75.2%。HRT為16h時反應(yīng)器出水的酸化率達到了最高值為19.1%,出水的VFA為20.3mmol/L。經(jīng)過水解酸化處理后,B/C提升到0.63左右,確定本實驗處理養(yǎng)牛場廢水的水解酸化反應(yīng)器的水力停留時間為16小時。對水解酸化反應(yīng)器進行了動力學(xué)分析,根據(jù)其穩(wěn)定運行的數(shù)據(jù)求得了動力學(xué)常數(shù)K,發(fā)現(xiàn)K值與HRT、污泥濃度、進水有機物濃度有關(guān)。經(jīng)過30天左右的時間兩級SBR反應(yīng)器啟動成功,后對曝氣時間、曝氣量以及沉淀時間等運行參數(shù)進行試驗,結(jié)果顯示一級SBR周期時間為9.5h(進水10min,曝氣8h,沉淀1h,排水20min),二級SBR周期時間為7.5h(進水10min,曝氣6h,沉淀1h,排水20min)。穩(wěn)定運行后兩級SBR系統(tǒng)對COD和SS的去除率比較穩(wěn)定,COD的去除率可達97%左右,出水COD濃度降為150mg/L左右,SS的去除率為93%左右,出水的SS濃度為130mg/L需進一步混凝試驗去除多余的懸浮物。兩級SBR系統(tǒng)氨氮的去除率在85%左右,TN的去除率在35%左右。系統(tǒng)內(nèi)硝化作用較大,將廢水中的氨氮大部分轉(zhuǎn)化為利于植物根部吸收的硝態(tài)氮�？疾炝怂馑峄蛢杉塖BR組合系統(tǒng)的抗沖擊負荷性能。結(jié)果發(fā)現(xiàn),組合系統(tǒng)對養(yǎng)牛廢水的處理效果比較穩(wěn)定,水解酸化段的穩(wěn)定性略差。兩級SBR動力學(xué)分析結(jié)果顯示兩級SBR中污泥有機物降解反應(yīng)符合一級反應(yīng),實驗結(jié)果與理論相吻合,一級SBR反應(yīng)器處理養(yǎng)牛場廢水,進水為5121.34mg/L時的反應(yīng)降解速率常數(shù)'1K為0.206h-1,二級SBR在進水780.15mg/L時的反應(yīng)降解速率常數(shù)'1K為0.08h-1。
[Abstract]:The wastewater from a cattle farm in Harbin has the characteristics of high concentration of COD and large amount of solid suspended solids. It is a typical high concentration organic wastewater. This paper takes the wastewater of cattle farm as the research object. In order to determine the high efficiency and low energy treatment process and its related parameters. For cattle farm wastewater treatment methods are mostly anaerobic aerobic treatment without hydrolysis acidification although cattle wastewater biodegradability is very good. However, because of the high concentration of COD, the effluent effect is not very good, and hydrolytic acidification can effectively improve the biodegradability of wastewater and reduce the COD of effluent. In this paper, coagulation-precipitation-hydrolytic acidification-two-stage SBR process was used to treat cattle farm wastewater. This process has short start-up period and flexible operation, and its hydrolytic acidification unit can effectively improve the biodegradability of wastewater. The SBR process can adapt to the change of wastewater quantity and water quality, which makes the treatment system have strong anti-shock load ability. In this study, FeCl _ 3Pac has been studied. Three coagulants of Al2(SO4)3 were used to treat cattle wastewater. The results showed that Fe Cl3 had the best effect on the treatment of the wastewater. The dosage of Fe Cl3 was 4ml / L and the precipitation time was 20min. The average removal rate of COD was 53.95% when the stirring time was 10 minutes. The average removal rate of SS was 62.74 and the treatment effect of hydrolytic acidification reactor was stable after 30 days of start-up and acclimation. It was found that the removal rates of COD and SS increased gradually with the prolongation of HRT, and tended to be stable at HRT=16h. The COD removal rate of effluent was 32.14%. When the removal rate of SS was 75.2 and HRT was 16 hours, the acidification rate of effluent reached the highest value of 19.1%. The VFA of effluent was 20.3 mmol / L. After hydrolyzing and acidizing treatment, the content of B / C increased to about 0.63. The hydraulic retention time of the hydrolytic acidification reactor for cattle farm wastewater treatment was determined to be 16 hours. The kinetic analysis of the hydrolytic acidification reactor was carried out and the kinetic constant K was obtained according to its stable operation data. It was found that K value was related to HRT, sludge concentration and influent organic concentration. After 30 days, the two-stage SBR reactor was successfully started, and the aeration time was analyzed. The operation parameters such as aeration rate and sedimentation time were tested. The results showed that the first stage SBR cycle time was 9.5 h (10 min for influent, 8 h for aeration, 1 h for sedimentation and 20 min for drainage). The cycle time of two-stage SBR is 7.5 h (10 min of influent, 6 h of aeration, 1 hour of sedimentation and 20 min of drainage). The removal rate of COD and SS by two-stage SBR system is stable after stable operation. The removal rate of COD can reach about 97%, and the removal rate of SS is about 93% when the concentration of COD in effluent drops to 150 mg / L or so. The SS concentration of effluent is 130 mg / L and the removal rate of ammonia nitrogen in two-stage SBR system is about 85%. The removal rate of TN is about 35%. Most of the ammonia nitrogen in wastewater was converted into nitrate nitrogen which is beneficial to plant root absorption. The impact load resistance of hydrolytic acidification and two-stage SBR combination system was investigated. The results of two-stage SBR kinetic analysis showed that the degradation of sludge organic matter in two-stage SBR was in accordance with first-order reaction. The experimental results were in good agreement with the theory. The degradation rate constant of the first-order SBR reactor was 0.206 h ~ (-1) when the influent was 5121.34 mg 路L ~ (-1) 路L ~ (-1). The degradation rate constant of secondary SBR was 0.08h-1 when the influent was 780.15mg / L.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X713

【引證文獻】

相關(guān)會議論文 前1條

1 覃登攀;吳烈善;唐植成;唐景靜;;啤酒工業(yè)廢水治理新技術(shù)探討[A];2007中國環(huán)境科學(xué)學(xué)會學(xué)術(shù)年會優(yōu)秀論文集（上卷）[C];2007年

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本文編號：1407232