本文選題：脫水性能　切入點：好氧消化　出處：《湖南大學》2015年碩士論文　論文類型：學位論文

【摘要】：隨著污水生物處理技術(shù)的普及,需要進行處理和處置的污泥量也會急劇增加,污泥若直接進行機械脫水,泥餅含水率仍高達80%左右,而中國固體廢物的填埋標準為含水率小于60%。因此,僅僅進行污泥的機械脫水是遠遠不夠的,采取有效的調(diào)理方法改善污泥的脫水效果,污泥的含水率降低,具有非常重要的工程意義。本論文利用污泥好氧消化技術(shù)和雙氧水氧化溶胞技術(shù),研究了兩種技術(shù)組合工藝對城市污水廠污泥脫水性能的影響,通過因素試驗對比以及正交試驗發(fā)現(xiàn)污泥好氧消化48h后,其污泥比阻和泥餅含水率經(jīng)雙氧水氧化后達到最低;組合工藝的調(diào)理優(yōu)先級順序為先進行污泥好氧消化,之后在酸性條件下進行雙氧水氧化;對污泥脫水性能影響較大的因素為污泥好氧消化溫度和污泥濃度,而污泥初始p H值、好氧消化溶解氧濃度和調(diào)理時間影響則不大;對污泥的最佳調(diào)理條件為:調(diào)理溫度范圍為30℃左右,污泥初始濃度為12000mg/L。污泥初始p H值為3,好氧消化溶解氧濃度為2.5mg/L,調(diào)理時間為60min,雙氧水投加量為75μl/g。在最佳條件下,污泥脫水程度和速度相比空白樣分別提高了10.66%和62.58%通過試驗發(fā)現(xiàn)雙氧水的氧化作用產(chǎn)生的微氣泡對污泥產(chǎn)生的氣浮濃縮能進一步產(chǎn)生泥水分離的效果,提取上層濃縮污泥進行脫水后其泥餅含水率脫水程度相比于雙氧水氧化污泥后均勻攪拌的泥餅含水率提高了4.15%,相比空白污泥提高了10.90%,脫水效果進一步增強,且比較于一般氣浮濃縮法還省去了壓縮空氣帶來的機械和動力費用。為進一步研究組合工藝改善污泥脫水性能的機理,本論文在組合工藝對污泥脫水后上清液中分別從蛋白質(zhì)、多糖和SCOD含量以及EPS四個方面分析了其變化規(guī)律對污泥脫水性能的影響。污泥經(jīng)組合工藝調(diào)理后,在一定時間內(nèi)LB-EPS含量和LB-EPS/TB-EPS質(zhì)量比明顯減小,這說明污泥中LB-EPS含量及LB-EPS/TB-EPS質(zhì)量比與污泥脫水性能存在一定關(guān)系,LB-EPS含量及LB-EPS/TB-EPS質(zhì)量比越高,污泥脫水難度越大。當污泥中LB-EPS含量減少后污泥脫水性能得到有效改善。
[Abstract]:With the popularization of wastewater biological treatment technology, the amount of sludge that needs to be treated and disposed of will increase sharply. If sludge is dewatered directly, the moisture content of mud cake is still up to 80%. However, the landfill standard of solid waste in China is that the moisture content is less than 60%. Therefore, it is far from enough to dewatering sludge by mechanical dewatering. It is not enough to adopt effective conditioning methods to improve the dewatering effect of sludge and reduce the moisture content of sludge. In this paper, the effects of two combined technologies on sludge dewatering performance of municipal wastewater treatment plant were studied by means of aerobic sludge digestion technology and hydrogen peroxide oxidation dissolved cell technology. Through the comparison of factors and orthogonal experiments, it was found that after aerobic digestion for 48 hours, the sludge specific resistance and sludge cake moisture content reached the lowest after oxidation with hydrogen peroxide, and the priority order of the combined process was that the sludge was digested by aerobic digestion first, and the sludge specific resistance and sludge cake moisture content reached the lowest after 48 hours of aerobic digestion. After that, hydrogen peroxide was oxidized under acidic conditions, and the factors affecting sludge dewatering performance were sludge aerobic digestion temperature and sludge concentration, but the initial pH value of sludge, aerobic digestion dissolved oxygen concentration and conditioning time had little effect on sludge dewatering performance. The optimum conditioning conditions for sludge are as follows: the temperature range is about 30 鈩，

本文編號：1651562