【摘要】：城市污水廠的剩余污泥,不加處理任意排放,會(huì)嚴(yán)重的污染環(huán)境。從剩余污泥中提取蛋白質(zhì),符合污泥資源化的目的,是當(dāng)前研究的熱點(diǎn)課題之一,耦合技術(shù)提取剩余污泥中蛋白質(zhì)具有明顯優(yōu)勢(shì)。本文以武漢市沙湖污水處理廠剩余污泥為研究對(duì)象,探討了基于熱、基于超聲波的耦合技術(shù)在剩余污泥蛋白質(zhì)提取上的應(yīng)用研究,分別從反應(yīng)體系的溫度、反應(yīng)時(shí)間、pH值、超聲波輸出功率、超聲波輸出時(shí)間、過氧化氫投加量和作用時(shí)間、硫酸鈉投加量等條件進(jìn)行系統(tǒng)的分析研究,對(duì)今后的剩余污泥蛋白質(zhì)的提取的研究起到借鑒作用。本研究主要可分為三個(gè)部分:基于熱耦合工藝的蛋白質(zhì)提取研究;基于超聲波耦合工藝的蛋白質(zhì)提取研究;基于最佳處理?xiàng)l件下上清液作為污水廠補(bǔ)充碳源的可行性研究。通過研究得出一些新的結(jié)論。1)在單一酸解、熱解作用下的蛋白質(zhì)提取效果較差,熱解與酸耦合處理技術(shù)不僅具有較高的蛋白質(zhì)提取率,而且試驗(yàn)過程中酸性環(huán)境會(huì)在體系中保護(hù)蛋白質(zhì),阻礙美拉德反應(yīng)的發(fā)生,縮短反應(yīng)時(shí)間。在試驗(yàn)溫度為110℃,試驗(yàn)pH條件為1左右,處理時(shí)間為6h的情況下,蛋白質(zhì)質(zhì)提取率達(dá)到61.59%,遠(yuǎn)遠(yuǎn)大于單一處理?xiàng)l件。2)超聲波輸出功率為65%(總功率為1200w),超聲波處理時(shí)間為22min情況下,單一超聲波處理的蛋白質(zhì)提取率為62.28%,提取率較高。單一過氧化氫和超聲波耦合過氧化氫處理剩余污泥均可以提取蛋白質(zhì),提取率分別為23.56%和59.18%,試驗(yàn)過程中,過氧化氫在水解細(xì)胞壁的同時(shí)也會(huì)對(duì)溶液中蛋白質(zhì)產(chǎn)生影響,而且當(dāng)試驗(yàn)結(jié)束時(shí),溶液中剩余的過氧化氫會(huì)繼續(xù)水解污泥和蛋白質(zhì),試驗(yàn)進(jìn)程較難掌握。而超聲波與硫酸鈉耦合工藝處理剩余污泥不僅蛋白質(zhì)提取率高(69.01%),而且試驗(yàn)進(jìn)程容易掌握,試驗(yàn)結(jié)束后無任何因素影響,試驗(yàn)清潔,不需對(duì)溶液進(jìn)行進(jìn)一步處理,最佳處理?xiàng)l件:超聲波輸出功率為65%,超聲波輸出時(shí)間為20min,鹽(硫酸鈉)的投加量為0.7mol/L。3)在最佳污泥處理?xiàng)l件下污泥溶液的上清液可作為碳氮比較低的污水的補(bǔ)充碳源。經(jīng)超聲波耦合鹽處理的剩余污泥上清液中含有大量的SCOD、N和P,將處理后的上清液做為營(yíng)養(yǎng)液培養(yǎng)活性污泥,并對(duì)反應(yīng)器水質(zhì)情況進(jìn)行分析。經(jīng)研究,污泥處理后上清液中SCOD去除率達(dá)到68.4%,上清液可作為補(bǔ)充碳源被活性污泥部分利用。
[Abstract]:The excess sludge of the municipal wastewater treatment plant will pollute the environment seriously if it is discharged arbitrarily. The extraction of protein from surplus sludge is in line with the purpose of sludge reuse and is one of the hot topics in current research. The coupling technology has obvious advantages in extracting protein from surplus sludge. In this paper, the application of coupling technology based on heat and ultrasonic in protein extraction of excess sludge from Shahu sewage treatment Plant of Wuhan City was studied. The temperature, reaction time and pH value of the reaction system were studied respectively. The ultrasonic output power, ultrasonic output time, hydrogen peroxide dosage and action time, sodium sulfate dosage and other conditions were systematically analyzed and studied, which could be used for reference in the study of protein extraction from surplus sludge in the future. This study can be divided into three parts: protein extraction based on heat coupling process, protein extraction based on ultrasonic coupling process, and feasibility study of supernatant as carbon source in wastewater treatment plant under optimal treatment conditions. Some new conclusions are obtained through the study. 1) the protein extraction efficiency is poor under the action of single acid hydrolysis and pyrolysis, and the technology of coupling pyrolysis and acid treatment not only has a high protein extraction rate, In addition, acid environment can protect protein in the system, hinder Maillard reaction and shorten reaction time. When the test temperature is 110 鈩，

本文編號(hào)：2310367