碱-高铁酸钾预处理促进污泥-玉米秸秆共发酵产酸  

Alkaline-Potassium Ferrate Pretreatment Promoting Acid Production Through Co-Fermentation of Waste Activated Sludge and Corn Straw

作　　者：于欣田 曾薇[1] YU Xintian;ZENG Wei(National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城镇污水深度处理与资源化利用技术国家工程实验室,北京100124

出　　处：《能源环境保护》2025年第2期109-119,共11页Energy Environmental Protection

基　　金：国家自然科学基金资助项目(52070004)。

摘　　要：开发一种高效的技术从废弃活性污泥(WAS)中回收碳(C)和磷(P)对促进低碳经济发展和资源的回收至关重要。本研究旨在探究碱性环境下高铁酸钾(PF)对污泥(WAS)-玉米秸秆(CS)共发酵体系的影响,利用实验室规模的序批式反应器探究了不同投加量(0、0.05、0.20、0.50 g/g VSSWAS,VSSWAS为剩余污泥中的挥发性悬浮固体)的PF对共发酵体系增溶水解与短链脂肪酸(SCFAs)生成的影响。结果表明,PF预处理对污泥及玉米秸秆中有机物的溶出具有促进作用。预处理24 h后,PF投加量为0.50 g/g VSSWAS实验组的溶解性化学需氧量(SCOD)、可溶性多糖及可溶性蛋白含量相较于未投加组分别提高了11.90、9.41和4.75倍。SCFAs产量随PF投加量的增多而增加,不同PF投加量实验组(0.05、0.20、0.50 g/g VSSWAS)的SCFAs最大积累量分别达到未投加组的1.47、1.92和2.21倍,且易于微生物利用的乙酸占比增大。微生物群落分析表明,实验组中Shannon指数下降,Firmicutes与Bacteroidota的丰度增加。Macellibacteroides、Bacteroides、norank_f_Rikenellaceae和Clostridium等产酸发酵菌是体系内主要的微生物群落。其中Clostridium作为铁还原菌还可被高浓度的Fe(Ⅲ)选择性富集,使丰度进一步提高。添加PF的发酵上清液具有较高的SCFAs含量及较低的磷(P)含量,适合作为水厂补充碳源使用。此外,在实验组中还观察到蓝铁矿的生成,可进一步实现磷资源回收。投加0.20 g/g VSSWAS的PF时,SCFAs和P的回收潜力良好,且经济效益最高,为63.96元/m^(3)WAS。因此建议最佳PF投加量为0.20 g/g VSSWAS,为污泥及玉米秸秆的资源化利用提供参考。Waste activated sludge(WAS)is a valuable waste resource rich in organic matter and nutrients,presenting significant potential for recycling.The recovery of carbon(C)and phosphorus(P)from WAS contributes to achieving carbon neutrality goals and helps alleviate the global shortage of phosphorus resources,thereby promoting sustainable agriculture.This study aimed to assess the effect of potassium ferrate(PF)on the co-fermentation system of waste activated sludge(WAS)and corn straw(CS)under alkaline conditions.Laboratory-scale sequencing batch reactors were used to investigate the impact of various PF dosages(0,0.05,0.20,0.50 g/g VSSWAS)on the enhanced solubilization,hydrolysis,and formation of short-chain fatty acids(SCFAs)in the co-fermentation system.The results demonstrated that PF pretreatment effectively disrupted the structure of WAS flocs and CS,facilitating the release of organic matter from WAS cells and extracellular polymeric substances(EPS),and promoting the release of polysaccharides from CS.This effect was more pronounced at higher PF dosages(≥0.20 g/g VSSWAS).After a 24-hour pretreatment,the levels of soluble chemical oxygen demand(SCOD),soluble polysaccharides,and proteins in the 0.50 g/g VSSWAS PF dosage group increased by 11.9,9.41,and 4.75 times,respectively,compared to the non-dosage group.The maximum accumulation of SCFAs at various PF dosages(0,0.05,0.20,0.50 g/g VSSWAS)increased by 1.47,1.92,and 2.21 times,respectively,compared to the non-dosage group,and the proportion of acetic acid,which is easily utilized by microorganisms,also increased.Microbial community analysis revealed a reduction in the Shannon index,with a notable enrichment of fermentation-related functional bacteria,including Firmicutes and Bacteroidota.Additionally,PF addition significantly enhanced the bioavailability of CS.At the genus level,acid-producing fermentative bacteria such as Macellibacteroides,Bacteroides,and Clostridium,known for utilizing polysaccharides like cellulose and hemicellulose,dominated the system,furt

关 键 词：剩余污泥 玉米秸秆 厌氧发酵 短链脂肪酸 高铁酸钾 磷回收 

分 类 号：X705[环境科学与工程—环境工程]