LUOLu,SHIZhou,XUShi-rong,et al.Effect of Lysozyme Pretreatment on Dewatering Performance of Excess Activated Sludge[J].China Water & Wastewater,2022,38(3):87-91.
溶菌酶預(yù)處理對(duì)剩余污泥脫水性能的影響
- Title:
- Effect of Lysozyme Pretreatment on Dewatering Performance of Excess Activated Sludge
- 關(guān)鍵詞:
- 剩余污泥; 溶菌酶; 脫水性能; 污泥結(jié)構(gòu)
摘要:- 將溶菌酶應(yīng)用于剩余污泥的預(yù)處理，考察了不同酶投加量對(duì)污泥脫水性能的影響，通過(guò)測(cè)定濾餅含水率、污泥比阻、污泥毛細(xì)吸水時(shí)
間（CST）、Zeta電位及污泥上清液中的蛋白質(zhì)和多糖含量，并采用顯微鏡和掃描電鏡觀測(cè)污泥絮體和顆粒結(jié)構(gòu)的變化，同時(shí)結(jié)合三維熒光光譜分析，研究原污泥和酶處理后污泥的脫水性能差異。結(jié)果表明，適宜的溶菌酶投加量可顯著改善剩余污泥的脫水性能，與原污泥相比，當(dāng)酶投加量為15%時(shí)，真空抽濾后的含水率由91.4%降到63.6%，比阻降低了82%，CST降低了65%，Zeta電位從-14.8 mV上升到2.7 mV。溶菌酶對(duì)污泥結(jié)構(gòu)的破壞是其改善污泥脫水性能的重要原因。
Abstract:- The lysozyme was used in the pretreatment of activated sludge, and the effect of lysozyme dosage on sludge dewatering performance was investigated. The moisture content of vacuum filtration sludge cake, sludge filtration resistance, sludge capillary sunction time (CST), Zeta potential and the protein & polysaccharides contents in sludge supernatant were analyzed. Moreover, the change of sludge flocs and granular structure were measured by normal microscope and scanning electron microscope. Based on the three?dimensional fluorescence spectrum, the sludge dewatering performance before and after lysozyme pretreatment was evaluated. The results showed that the appropriate lysozyme dosage could enhance the sludge dewatering performance. When the lysozyme dosage was 15%, the moisture content of vacuum filtration sludge cake decreased from 91.4% to 63.6%, the sludge filtration resistance decreased by 82%, CST decreased by 65%, and the Zeta potential increased from -14.8 mV to 2.7 mV. The results showed that the destruction of sludge structure by lysozyme was an important reason for improving sludge dewatering performance.
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