LIUYong-jian,LIUYu-lei,XUXue-xin,et al.Parameter Optimization and Mechanism of Ultrasonic and Anaerobic Digestion for the Treatment of Excess Sludge[J].China Water & Wastewater,2022,38(5):84-90.
超聲/厭氧消化處理剩余污泥參數(shù)優(yōu)化及機(jī)理研究
- Title:
- Parameter Optimization and Mechanism of Ultrasonic and Anaerobic Digestion for the Treatment of Excess Sludge
- Keywords:
- ultrasounic; anaerobic digestion; excess sludge; parameter optimization; mechanism; particle size
摘要:- 針對(duì)污水廠剩余污泥量大和低C/N污水脫氮碳源不足問(wèn)題，將剩余污泥破壁作為碳源回用，具有較強(qiáng)的可行性和現(xiàn)實(shí)意義。為此，研究了超聲聯(lián)合厭氧消化工藝破解剩余污泥的適宜運(yùn)行參數(shù)和溶出物質(zhì)的效果，并探究了污泥破解機(jī)理。通過(guò)對(duì)SCOD、蛋白質(zhì)、多糖、VFAs的濃度變化趨勢(shì)進(jìn)行分析，確定了超聲聯(lián)合厭氧消化工藝的最佳組合參數(shù)：聲能密度為1.5 W/mL，處理時(shí)間為30 min，厭氧消化處理時(shí)間為7 d。對(duì)剩余污泥進(jìn)行超聲預(yù)處理發(fā)現(xiàn)，隨著聲能密度的增強(qiáng)，污泥液相中各物質(zhì)濃度增大，但30 min以后各物質(zhì)濃度的增長(zhǎng)趨勢(shì)逐漸變緩。厭氧消化能夠幫助污泥溶胞，并且可以提升VFAs濃度。通過(guò)污泥粒徑的變化可知，超聲可以破壞污泥的絮體結(jié)構(gòu)，進(jìn)而加快水解過(guò)程，縮短厭氧消化時(shí)間。
Abstract:- Aiming at the problem of large amount of excess sludge and insufficient carbon source for denitrification of low C/N wastewater, it is feasible and practical to reuse the disintegrated excess sludge as carbon source. The optimal operating parameters and the release of dissolved substances in the process of ultrasonic combined with anaerobic digestion for excess sludge disintegration were investigated, and the mechanism of sludge disintegration was explored. By analyzing the profile of SCOD, protein, polysaccharide and VFAs concentrations, the optimal parameters of ultrasonic combined with anaerobic digestion were determined as follows: acoustic energy density of 1.5 W/mL, treatment time of 30 min and anaerobic digestion treatment time of 7 days. Ultrasonic pretreatment of excess sludge showed that the concentration of each substance in liquid phase increased with the increase of acoustic energy density.However,the increasing trend of each substance concentration gradually slowed down.Anaerobic digestion was beneficial to sludge lysis and increased VFAs concentrations. Variations in sludge particle size indicated that ultrasonic destroyed the floc structure of sludge, so as to accelerate the hydrolysis process and shorten the anaerobic digestion time.
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