球磨热碱耦合法破解污泥-释放碳源及污泥减量化的效率  

Efficiency of sludge cracking-carbon source release and sludge reduction by a ball milling-thermo-alkali coupling method

作　　者：刘壮壮 唐玉朝[1] 伍昌年[1] 王坤[1] 陈徐庆 刘俊 张彬彬 LIU Zhuangzhuang;TANG Yuchao;WU Changnian;WANG Kun;CHEN Xuqing;LIU Jun;ZHANG Binbin(Anhui Provincial Key Lab of Environmental Pollution Control and Resource Reuse,Anhui Jianzhu University,Hefei 230601,China;Anhui Zhonghuan Environmental Protection Technology Co.Ltd.,Hefei 230051,China)

机构地区：[1]安徽建筑大学,环境污染控制与废弃物资源化利用安徽省重点实验室,合肥230601 [2]安徽中环环保科技股份有限公司,合肥230051

出　　处：《环境工程学报》2023年第1期332-342,共11页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金项目(51978003);安徽省高校自然科学研究项目(KJ2019ZD54)。

摘　　要：研究了球磨热碱耦合法破解污泥释放碳源的效率,进一步探索了直接以破解液代替外加碳源用于反硝化脱氮的可行性,并研究了该方法对污泥减量化的效果。结果表明,在水浴温度80℃,复合碱投加量为154 mg·g^(-1)(以污泥VS干重计),反应24 h后,对于浓缩后含水率为93.8%的污泥,破解液中SCOD达到2.013×10^(4) mg·L^(-1),COD达到4.725×10^(4) mg·L^(-1)。三维荧光光谱显示,污泥破解液中荧光性有机物质以易生物降解的色氨酸类和微生物代谢副产物类占据主导地位。污泥处理前后,TS由61.7 g·L^(-1)下降至15.6 g·L^(-1),其中部分超细颗粒随上浊液回收利用,污泥减量化程度达到74.7%;VS由30.4 g·L^(-1)下降到4.6 g·L^(-1),挥发性有机质的去除率达到84.7%。粒径分析结果表明,原始污泥中值粒径由预处理前28.1μm降为12.6μm,粒径显著减小,并产生2.5μm左右的细颗粒悬浮于破解液。随后以破解污泥沉淀后的上浊液直接作为替代碳源,在模拟的反硝化实验中(外加硝酸钾作为氮源),反应器持续运行稳定后,NO_(3)^(-)-N的去除率均高于97.0%。以上结果表明球磨热碱耦合法是一种非常高效污泥减量化方法,破解液可有效作为反硝化碳源使用,污泥资源化和减量化效果好,是一种非常有前途的污泥处理处置方法。In this study, the efficiency of carbon source released from sludge by a ball milling-thermal alkali coupling method was investigated, and the feasibility of directly replacing the external carbon source with the cracking solution for denitrification was further explored, as well as the effect of this method on sludge reduction. The results showed that, for the sludge with concentrated water content of 93.8%, at the water bath temperature of 80 ℃, the compound alkali dosage of 154 mg·g^(-1)(calculated by sludge VS dry weight), SCOD and COD in the cracking solution reached 2.013×10^(4) mg·L^(-1)and 4.725×10^(4) mg·L^(-1)after reaction for 24 h,respectively. As indicated by three-dimensional fluorescence spectra, the fluorescent organic substances in the sludge cracking solution were dominated by easily biodegradable tryptophan and microbial metabolic byproducts. Before and after sludge treatment, the TS decreased from 61.7 g·L^(-1)to 15.6 g·L^(-1), and some ultrafine particles were recycled with the upper turbidity solution, and the sludge reduction degree reached 74.7%.VS decreased from 30.4 g·L^(-1)to 4.6 g·L^(-1), and the removal rate of volatile organic matter reached 84.7%. As suggested by the particle size analysis results, the median particle size of the original sludge decreased from^(2)8.1 μm( before pretreatment) to 12.6 μm, and fine particles with a particle size of about 2.5 μm were produced and suspended in the cracking solution. Subsequently, the upper turbidity solution after sludge cracking sedimentation was directly used as the carbon source. In the simulated denitrification experiment(with the potassium nitrate added externally as the nitrogen source). Moreover, the removal rate of NO_(3)^(-)-N was higher than 97.0% after continuous and stable operation of the reactor. As demonstrated by the above experimental results, the ball milling-thermal alkali coupling method is a tremendously efficient sludge reduction method.Aside from that, the cracking solution can be effectively used as

关 键 词：污泥破解 球磨热碱耦合法 破解液 碳源 

分 类 号：X52[环境科学与工程—环境工程]