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Journal of Harbin Institute of Technology(New Series) 2015年第6期22卷 1-10页

作者： Siliang Li Liangliang Wei Qingliang Zhao Lu Li School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China Longjiang Environmental Protection Group Co. LTD Harbin 150056 China

One of the challenges faced by sewage sludge treatment and disposal is its higher water content,and how to efficient dewater those hazardous materials properly is welcome in practice. This study stabilized the sewage sludge via the using of conventional curing agents and calcined aluminum salts,and the corresponding dewatering mechanisms and structural changes of the stabilized sludge were further comparable *** results showed that wollastonite and kaolin exhibit a relative higher dewatering efficiency as compared to other conventional curing agents; however the releasing rate of heavy metals of Cu,Cr,Ni for kaolin solidification and Zn,Pb for wollastonite solidification is higher than the sludge samples solidified by other curing agents. For comparison,the sludge samples solidified by calcined aluminum salts (AS),calcium ash,Mg-based curing agent,tricalcium aluminate( C_3A) show a lower heavy metals leaching potential and unconfined compressive strength. In addition,the economic characteristics and local availability of AS,calcium ash,C_3A and CaO makes it have a broad prospect in extension and application. These findings are of great significance for stabilization and dewatering of sewage sludge.

关键词： sludge dewatering curing agents solidification/stabilization heavy metal leaching

维普期刊数据库

Enhanced dewaterability of waste activated sludge by UV assisted ZVI-PDS oxidation

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Journal of Environmental Sciences 2022年第3期34卷 152-164页

作者： Yanping Zhang Tiantian Li Jiayu Tian Huichun Zhang Fen Li Jiahua Pei School of Civil Engineering and Transportation Hebei University of TechnologyTianjin 300401China Department of Civil and Environmental Engineering Case Western Reserve UniversityClevelandOH 44106USA College of Chemical and Environmental Engineering Harbin University of Science and TechnologyHarbin 150000China

Ultraviolet(UV)assisted zero-valent iron(ZVI)-activated sodium persulfate(PDS)oxidation(UV-ZVI-PDS)was used to treat waste activated sludge(WAS)in this *** dewaterability performance and mechanism of WAS dewatering were *** results showed that UV-ZVI-PDS can obtain better sludge dewatering performance in a wide pH range(2.0-8.0).When the molar ratio of ZVI/PDS was 0.6,UV was 254nm,PDS dosage was 200 mg/g TS(total solid),pH was 6.54,reaction time was 20 min,the CST(capillary suction time)and SRF(specific resistance to filtration)were decreased by 64.0%and 78.2%,*** molar ratio of ZVI/PDS used in this paper is much lower than that of literatures,and the contents of total Fe and Fe^(2+) in sludge supernatant remained at a low level,as 3.7 mg/L and 0.0 mg/*** analysis of extracellular polymeric substances(EPS),scanning electron microscope(SEM)and particle size distribution showed that the EPS could be effectively destroyed by UV-ZVI-PDS,the sludge flocs broken down into smaller particles,cracks and holes appeared,and then the bound water was *** the same time,the highly hydrophilic tightly bound-EPS(TB-EPS)were converted into loosely bound EPS(LB-EPS)and soluble EPS(S-EPS).During sludge pretreated by UV-ZVI-PDS,positively charged ions,such as Fe^(2+),Fe^(3+) and H^(+),produced in the reaction system could reduce the electronegativity of sludge surface,promote sludge particles aggregation,and then enhanced the sludge dewaterability.

关键词： sludge dewatering Persulfate Zero-valent iron UV Extracellular polymeric substances

维普期刊数据库

Application of organic polymeric flocculants in centrifugal dewa-tering of oil refinery sludge

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Journal of Environmental Sciences 2003年第4期15卷 510-513页

作者： JINYi-zhong ZHANGYue-feng CHENXiao-ping: GAOHua-sheng DepartmentofEnvironmentalScienceandEngineeringofZhejiangUniversity Hangzhou310027China. EnvironmentalScienceResearch&Desig~InstituteofZhejiangProvince Hangzhou310007China

In order to evaluate the applicability of the organic polymeric flocculants(OPF) in the treatment of oil refinery sludge, experiments were conducted to show that OPF have better performance of flocculation than inorganic flocculants. Both the anionic and cationic OPF have satisfactory flocculation efficiency in oil sludge treatment, but the latter are more cost efficient. Among the over 20 types of flocculants tested, 2 OPF(CPAM 2 and HPAM 2) were selected as the treatment agents, based on their good treatment performances, oil resistance and economic feasibility. It was demonstrated in the industrial scale centrifugal dewatering experiments that the application of either CPAM 2 or HPAM 2 could achieve high treatment efficiency of the oil sludge dewatering and reduce the COD of centrifugal liquid to less than 1000 mg/L.

关键词： organic polymeric flocculant oil refinery sludge sludge dewatering centrifugal liquid

维普期刊数据库

Research progress on chemical conditioning and deep dehydration of typical sludge

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西部人居环境学刊 2016年第S1期 38-43页

作者： HuaiLi Zheng Yingpeng Gu Qianying Shou Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment Ministry of EducationChongqing University National Centre for International Research of Low-carbon and Green Buildings Chongqing University Chongqing Engineering Research Center of Water Treatment Coagulant

In order to make sludge reduced,stabilized,harmless and resource-oriented,choosing reasonable chemical and equipment is an important partof sludge *** review mainly introduces the characteristics of chemical conditioning agent,methods and mechanism of sludge *** commonly used sludge dewatering equipment and its characteristics are also summarized in this *** last,it points out some existing problems and future research directions in this field.

关键词： sludge Chemical conditioning sludge dewatering