本文關(guān)鍵詞： 剩余污泥 預(yù)處理 揮發(fā)酸 磷　出處：《遼寧大學》2015年碩士論文　論文類型：學位論文

【摘要】：近年來由于城鎮(zhèn)化發(fā)展進程加快,使得越來越多的污水進入城鎮(zhèn)污水處理廠,導(dǎo)致大量剩余污泥產(chǎn)生。目前,污泥處理處置運行成本已占污水處理廠50%以上,這正成為一個亟待解決的問題。剩余污泥中含有大量的無毒有機物和磷,這些都是重要的回收資源。然而,由于污泥水解發(fā)酵階段需要較長時間,并且效率低下,這正成為污泥厭氧發(fā)酵的限速步驟。本課題的研究以污泥資源化為切入點,通過研究兩種污泥預(yù)處理技術(shù)對剩余污泥破解效果和厭氧發(fā)酵過程中產(chǎn)揮發(fā)酸和磷釋放的影響,獲得了相對能較高回收剩余污泥中碳源和磷源的處理方法。第一種方法研究了單獨超聲(US)、單獨Fenton和超聲/Fenton(US/Fenton)聯(lián)合預(yù)處理對剩余污泥水解酸化效果的影響。結(jié)果表明,超聲/Fenton聯(lián)合預(yù)處理后的溶解性碳水化合物濃度為441 mg COD/L,分別是單獨Fenton、單獨超聲和未經(jīng)預(yù)處理污泥的2.36倍、2.17倍和17.11倍。相對應(yīng)的聯(lián)合預(yù)處理后的溶解性蛋白質(zhì)濃度為2059 mg COD/L,分別是單獨Fenton、單獨超聲和未經(jīng)預(yù)處理污泥的2.43倍、1.47倍和13.37倍。聯(lián)合預(yù)處理后的污泥破解率DDSCOD為15.4%,而超聲和Fenton預(yù)處理分別只有9.97%和3.18%。此外,未處理污泥的顆粒粒徑d50在44.01μm,與Fenton預(yù)處理后相近(41.53μm),但是高于超聲(24.52μm)和聯(lián)合預(yù)處理(22.63μm)。聯(lián)合預(yù)處理后的污泥最大揮發(fā)酸積累量為4594 mg COD/L,而單獨超聲處理為3485 mg COD/L,單獨Fenton處理為2700 mg COD/L。實驗得出聯(lián)合預(yù)處理法對提高污泥水解和后續(xù)厭氧發(fā)酵產(chǎn)揮發(fā)酸有協(xié)同作用。第二種方法對高壓脈沖預(yù)處理強化剩余污泥水解和釋磷效果進行了研究。經(jīng)過高壓脈沖處理后的溶解性化學需氧量(SCOD)濃度為1405 mg/L,是未處理污泥的6.4倍,有利于后續(xù)厭氧發(fā)酵過程。高壓脈沖預(yù)處理后的溶解性正磷酸鹽濃度為109 mg/L,是未處理污泥的1.5倍。然而,在厭氧發(fā)酵過程中,也會有較高濃度的金屬離子釋放。所以,最好在厭氧發(fā)酵的前3-4天,也就是大量磷酸鹽沉淀形成前對發(fā)酵液進行磷回收。通過SMT方法(Standards,Measurements and Testing)分析,得出在厭氧發(fā)酵過程中,污泥固相中的磷灰石無機磷(AP)和有機磷(OP)保持相對穩(wěn)定。所以,厭氧發(fā)酵液中的正磷酸鹽釋放主要來自非磷灰石無機磷(NAIP)的溶解。實驗結(jié)果表明,在污泥厭氧發(fā)酵前進行高壓脈沖預(yù)處理是一種提高污泥水解和釋磷的有效方法。
[Abstract]:In recent years, due to the rapid development of urbanization, more and more sewage into urban sewage treatment plants, resulting in a large number of excess sludge. The operating cost of sludge treatment and disposal has accounted for more than 50% of the sewage treatment plant, which is becoming an urgent problem to be solved. The excess sludge contains a large amount of non-toxic organic matter and phosphorus, which are important resources for recovery. Sludge hydrolysis and fermentation stage takes a long time and low efficiency, which is becoming the speed limit step of anaerobic sludge fermentation. The effects of two sludge pretreatment techniques on the cracking effect of excess sludge and the release of volatile acid and phosphorus during anaerobic fermentation were studied. A relatively high recovery method for carbon and phosphorus sources in excess sludge was obtained. The effect of Fenton alone and ultrasonic / Fenton / US / Fenton pretreatment on the hydrolysis and acidification of excess sludge was studied. The concentration of soluble carbohydrate after ultrasonic / Fenton pretreatment was 441mg / L, respectively, which was Fenton alone. The concentration of soluble protein of ultrasonic alone and untreated sludge was 2.36 times 2.17 times and 17.11 times as much as that of untreated sludge. The corresponding concentration of soluble protein was 2059 mg COD/L. Fenton alone, ultrasound alone and untreated sludge were 2.43 times, 1.47 times and 13.37 times as much as those of untreated sludge, respectively. The sludge cracking rate (DDSCOD) after combined pretreatment was 15.4%. However, ultrasonic and Fenton pretreatment were only 9.97% and 3.18, respectively. In addition, the particle size of untreated sludge was 44.01 渭 m. It was close to 41.53 渭 m after pretreatment with Fenton. But it was higher than that of ultrasonic treatment (24.52 渭 m) and combined pretreatment (22.63 渭 m). The maximum accumulation of volatile acid in sludge after combined pretreatment was 4594 mg / COD/L. The ultrasound alone was 3485 mg COD/L. 2700mg treated with Fenton alone. The experiment shows that the combined pretreatment method has synergistic effect on sludge hydrolysis and subsequent anaerobic fermentation to produce volatile acid. The second method is to study the effect of high pressure pulse pretreatment on the enhancement of hydrolysis and phosphorus release of excess sludge. Dissolved chemical oxygen demand after high pressure pulse treatment. The concentration of SCO was 1405 mg/L. The concentration of dissolved orthophosphate after high pressure pulse pretreatment was 109 mg / L, 1.5 times as much as that of untreated sludge. Higher concentrations of metal ions are also released during anaerobic fermentation. Therefore, it is best to do so 3-4 days before anaerobic fermentation. In other words, phosphorus was recovered from the fermentation broth before the formation of a large amount of phosphate precipitation. The SMT method was used to analyze the phosphorus content of the fermentation broth by Standard measures and testing. The results showed that the apatite inorganic phosphorus (APP) and organic phosphorus (OPP) in the solid phase of sludge remained relatively stable during anaerobic fermentation. The release of orthophosphate from anaerobic fermentation broth mainly comes from the dissolution of non-apatite inorganic phosphorus (NAIPP). High pressure pulse pretreatment before anaerobic fermentation is an effective method to improve sludge hydrolysis and phosphorus release.
【學位授予單位】：遼寧大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：X703

【參考文獻】

相關(guān)期刊論文 前2條

1 張杰;文湘華;朱洪濤;許美蘭;王曉慧;;常溫下剩余污泥水解酸化強化方法研究進展[J];中國給水排水;2009年18期

2 于靜;羅琨;楊麒;李小明;謝冰心;楊國靖;莫創(chuàng)榮;;表面活性劑促進剩余污泥酶水解的研究[J];環(huán)境科學;2011年08期

相關(guān)博士學位論文 前2條

1 楊潔;堿和超聲波預(yù)處理技術(shù)促進污泥厭氧消化效能及機理研究[D];天津大學;2008年

2 周愛娟;預(yù)處理促進剩余污泥發(fā)酵制取短鏈脂肪酸的效能及機制研究[D];哈爾濱工業(yè)大學;2014年

，

本文編號：1481682