發(fā)布時(shí)間：2018-03-30 16:23

  本文選題：碳源梯級(jí)利用　切入點(diǎn)：雙污泥系統(tǒng)　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：城鎮(zhèn)污水脫氮除磷過程中碳源不足問題一直是水處理行業(yè)中亟待解決的關(guān)鍵問題。本課題針對(duì)這個(gè)問題提出基于碳源梯級(jí)利用模式的深度反硝化脫氮除磷新工藝,即污水中的碳源先在厭氧階段被聚磷菌利用釋磷后,進(jìn)入初級(jí)缺氧階段被反硝化菌利用進(jìn)行反硝化反應(yīng),這時(shí)污水中易被生物利用的碳源幾乎消耗殆盡,再進(jìn)入水解酸化階段,剩余的不容易被生物利用的碳源將轉(zhuǎn)化成為易被生物利用碳源,隨后進(jìn)入二級(jí)缺氧反應(yīng)階段進(jìn)行深度反硝化,同時(shí)由于反硝化聚磷菌的存在,利用生物體內(nèi)碳源在反硝化的同時(shí)進(jìn)行過量吸磷,既保證了碳源的供給,又完成了磷的過量攝取。這樣可以解決碳源不足問題,及由于碳源過多進(jìn)入好氧階段造成異養(yǎng)菌與自養(yǎng)菌的競爭問題。本工藝采用雙污泥系統(tǒng),即硝化污泥和反硝化聚磷污泥存在于兩個(gè)完全獨(dú)立的污泥循環(huán)系統(tǒng),利于各功能菌群獨(dú)立發(fā)揮各自優(yōu)勢(shì)。在室溫下啟動(dòng)反應(yīng)器,并在室溫下對(duì)系統(tǒng)運(yùn)行參數(shù)進(jìn)行調(diào)整與優(yōu)化,包括硝化液回流比(R)、污泥回流比(r)和水力停留時(shí)間(HRT)的優(yōu)化研究,確定系統(tǒng)運(yùn)行最優(yōu)工況。研究結(jié)果表明,硝化液回流比R2≤160%時(shí),系統(tǒng)對(duì)COD、TP和TN的去除效果隨著硝化液回流比R2的升高而升高,在R2=160%時(shí)達(dá)到最大值,3種污染物的去除率分別為78.8%、88.0%和80.5%,而當(dāng)R2=200%時(shí),厭氧池釋磷惡化,COD利用率降低,整個(gè)系統(tǒng)脫氮除磷效果不理想;污泥回流比r≤80%時(shí),系統(tǒng)對(duì)COD、TP和TN的去除效果隨著污泥回流比r的升高而升高,在r=80%時(shí)達(dá)到最大值,3種污染物的去除率分別為82.4%、90.8%和83.7%,而當(dāng)r=100%時(shí),污水實(shí)際HRT縮短,污泥濃度過高且易沉積,影響了整個(gè)系統(tǒng)脫氮除磷效果;HRT從24.00h縮短到16.00h后,系統(tǒng)仍有較好的脫氮除磷效果,TP和TN的去除率分別為80.7%和84.6%;而當(dāng)HRT進(jìn)一步縮短到12.00h后,厭氧段釋磷量和缺氧池2反硝化除磷效果大幅度下降,好氧池硝化效果逐漸變差,此時(shí)TP和TN的去除率分別為45.3%和70.7%。故系統(tǒng)運(yùn)行最優(yōu)工況為R1=40%、R2=160%、r=80%,對(duì)于HRT而言,可考慮將厭氧池HRT縮短至1.50h左右,缺氧池1HRT控在2.00h左右,水解酸化池HRT控制在5.50左右,缺氧池2HRT控制在3.00h左右,接觸氧化池HRT控制在4.00h左右。
[Abstract]:The shortage of carbon source in the process of nitrogen and phosphorus removal has been the key problem to be solved in the water treatment industry.In order to solve this problem, a new process of deep denitrifying nitrogen and phosphorus removal based on the carbon source cascade utilization model was put forward, that is, the carbon source in sewage was first utilized by phosphorus accumulating bacteria in anaerobic stage, and then phosphorus was released.In the primary anoxic stage, denitrification is carried out by denitrifying bacteria, and the carbon sources that are easily bioutilized in the sewage are almost exhausted, and then enter the stage of hydrolysis and acidification.The remaining carbon source, which is not easily bioavailable, will be converted into a bioavailable carbon source, and then deep denitrification is carried out in the second stage of anoxic reaction, at the same time, because of the presence of denitrifying phosphorus accumulating bacteria,Excessive phosphorus uptake by denitrification can ensure both the supply of carbon source and the excessive uptake of phosphorus.This can solve the problem of insufficient carbon source and the competition between heterotrophic bacteria and autotrophic bacteria due to the excessive entry of carbon source into aerobic stage.In this process, two sludge systems, nitrifying sludge and denitrifying phosphorus accumulating sludge, are used in two completely independent sludge circulatory systems, which is beneficial to each functional flora to play its own advantages independently.The reactor was started at room temperature, and the system operation parameters were adjusted and optimized at room temperature, including the optimization of nitrifying liquid reflux ratio (RN), sludge reflux ratio (R) and HRT (hydraulic retention time) to determine the optimal operating conditions of the system.When the sludge reflux ratio r 鈮，

本文編號(hào)：1686684