检索结果-南通市图书馆

Nano-CaO_(2)Promotes the Release of Carbon Sources from municipal sludge and the Preparation of Double-Network Hydrogels with High Swelling Ratios

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Renewable Materials 2023年第3期11卷 1237-1253页

作者： Yalin Li Yu Huang Lei Liu Haozhao Liu Haiyang He Dongxue Lu Tingting Dong School of College of Environmental and Biological Engineering Henan University of EngineeringZhengzhou451191China School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China

In this study,hydrogels were prepared from municipal sludge to recycle and realize the value-added utilization of the carbon components in this abundant waste material.The carbon sources were extracted from the municipal sludge using synthesised nano CaO_(2)as an oxidant,and the carbon sources were graft copolymerised with acrylic acid monomer using N,N′-methylenebisacrylamide as a crosslinking agent and ammonium persulfate as an initiator.The factors influencing the hydrogel preparation were investigated by single-factor experiments.Based on the results of the single-factor experiments,a hydrogel with a swelling ratio of up to 19768.4%at 12 h was prepared with an oxidant dosage of 0.20 g,a monomer dosage of 5.8 g,a neutralisation degree of the monomer of 70%,an initiator dosage of 0.15 g,and a crosslinking agent dosage of 0.15 g.The hydrogel preparation conditions were optimized using the response surface method,and the interactions between the different reaction conditions were analysed to obtain the best preparation conditions.X-ray diffraction results showed that hydrogels were amorphous in structure.Scanning electron microscopy images showed that the SiO_(2)particles from the sludge acted as crosslinking points between different layers of hydrogel chains.The crosslinking polymerisation and crosslinking agent worked together to form hydrogels with an inorganic-organic double network structure,and this structure was highly stretchable,resulting in hydrogels with good swelling properties.

关键词： Oxidant municipal sludge carbon component swelling property hydrogel

Biodiesel production from microbial lipid obtained by intermittent feeding of municipal sludge and treated crude glycerol

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Systems Microbiology and Biomanufacturing 2021年第3期1卷 344-355页

作者： Lalit R.Kumar Sravan K.Yellapu R.D.Tyagi Patrick Drogui INRS-ETE Universite du QuebecQuebec G1K 9A9Canada School of Technology Huzhou UniversityHuzhouChina BOSK BIOPRODUCTS 100-399 rue JacquardQuebec G1N 4J6Canada

In the present study,municipal secondary sludge and purified glycerol(obtained after acid treatment of crude glycerol)were used together for lipid production using intermittent feeding strategy.Intermittent sludge feeding strategy(sludge SS 30 g/L)resulted in a higher biomass(54.99 g/L)and lipid concentration(25.35 g/L)at 96 h when compared to 35 g/L SS single sludge feeding or control strategy(45.67 g/L biomass&19.16 g/L lipid).Moreover,the intermittent sludge feeding strategy significantly reduced foaming and requirement of anti-foam during fermentation when compared to control strategy.The energy balance of biodiesel production from lipid obtained by intermittent sludge feeding strategy(30 g/L SS)was energeti-cally favorable.It was also revealed from yield coefficients and energy balance that sludge had an important contribution in microbial lipid and biodiesel production.

关键词： Intermittent feeding municipal sludge Purified glycerol Microbial lipid Biodiesel

Research on Characteristic of Fe2+/S2O2-8Composite CaO Synergetic Conditioning for municipal sludge

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Protection 2021年第1期12卷 13-28页

作者： Zezheng Dong Yong Wang Min Yue Ping Zhang Jingcai Chang School of Environmental Science and Engineering Shandong University Qingdao China Qingdao Daneng Environmental Protection Equipment Co. Ltd. Qingdao China Editorial Department of “Journal of Shandong University” (Philosophy and Social Science) Jinan China Shandong Urban Construction Vocational College Jinan China

For the problem as high energy consumption and sludge increment during the municipal sludge management process with advanced oxidation technology of sulfate radical, the Fe2+/S2O2-8 composite CaO reaction system was set up. Meanwhile, systematical studies had been carried out for coordinated conditioning of municipal concentrated sludge. The scientific process parameters were determined with the help of sludge capillary suction time, sewage sludge moisture content and other core indicators and the effect of traditional polyacrylamide flocculation method, Fenton method and activated persulfate method were compared. The results showed that in the neutral concentrated sludge conditioning, there were outstanding advantages for Fe2+/S2O2-8 composite CaO reaction system compared with Fenton, CPAM, and SO-4 methods and the optimal parameters for dosage were as follows: Fe2+/S2O2-8: 80 - 120 mg·g-1 DS, n(Fe2+):n(SPS) = 0.8:1, CaO: 200 mg·g-1 DS. To achieve similar performance index, the dosage of Fe2+ per ton for sludge could be reduced by 20%, the loss rate for iron in filtrate was 0.5%, dewatering of sludge by suction filtration was within 50 s and the moisture content for dewatering cake was 53.7%, which significantly improved the economy and practicability of SO-4 advanced oxidation technology, and the results were expected to form a useful supplement to the popularization and application of SO-

关键词： sludge Conditioning Fe2+ Persulfate Quicklime Economy municipal sludge

Investigation on the Outputs of municipal sludge and Analysis on Properties of Hefei

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Investigation on the Outputs of Municipal Sludge and Analysi...

Modified corn-core powder for enhancing sludge dewaterability:Synthesis,characterization and sludge dewatering performance

The 2nd International Conference on Asian-European Environmental Technology and Knowledge Transfer

作者： Cornelius Jantschke Michaell Nelles Rostock University

The source and output of municipal sludge was investigated.The content of heavy metal,total nitrogen,total phosphor and organic material and soon were analyzed carefully.The basic properties such as total bacterium,moisture,pH,calorific value,volatile content,ash and fixed carbon were measured.The synthetic methods of 3 R treatments for Hefei municipal sludge were put forward.

关键词： municipal sludge thermal value volatile content fixed carbon

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2021年第4期34卷 368-377页

作者： Zhiying Guo Liping Ma I Quxiu Dai Xinbo Yang Ran Ao Jie Yang Jing Yang Wengang Li Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China Yunnan Tianlang Energy Saving&Environmental Protection Group Co.Ltd Kunming 650300China College of Resources and Environment Chengdu University of Information TechnologyChengdu 610225China School of Environmental and municipal Engineering Xi'an University of Architecture and TechnologyXi'an 710000China

The high water content of sludge has always posed significant challenges for its treatment.Synthetic flocculants,which are widely used in sewage treatment plants,can cause secondary pollution during their production and use.Thus,natural polymer flocculants made of natural materials have received increased research attention recently.Corncore,an agricultural waste,was modified through alkalization with sodium hydroxide(NaOH)and etherification with cetyltrimethylammonium bromide(CTMAB)in this study.The L16(45)orthogonal array was used to study the modification conditions.The moisture content(MC)of treated sludge was reduced by approximately 37%with the addition of modified corncore powder(MCCP),which was synthesized under optimal conditions.In addition,changes in the functional groups of the material before and after modification were determined by FTIR.Thermogravimetric analysis indicated that MCCP was steady at room temperature,moreover,BET analysis showed that MCCP had greater surface area.The microstructures of material before and after modification were examined by scanning electron microscopy,revealing that MCCP had a flakeshaped structure and had an increased area of contact area with sludge particles.MCCP is a dehydrating agent that can enhance sludge dewaterability through charge neutralization and reagglomeration and provide superior economic benefits.

关键词： municipal sludge Corn-core powder Pollution Polymers Waste treatment

Characteristics of coal sludge slurry prepared by a wet-grinding process

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

International Journal of Mining Science and Technology 2016年第5期26卷 947-953页

作者： Ma Shaolian Wu Guoguang Meng Xianliang Zhou Rui Chu Ruizhi Miao Zhenyong Qi Yueming School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou 221116 China Ministry of Education＇s Key Lab of Coal Processing and High Efficient Clean Utilization Xuzhou 221116 China Advanced Analysis and Computation Center China University of Mining ＆ Technology Xuzhou 221116 China School of Resources and Ceosciences China University of Mining ＆ Technology Xuzhou 221116 China

Coal sludge slurry(CSS) is an alternative fuel and a potential competitive method for sludge reduction.Based on the researches of coal water slurry, we studied CSSs by using a wet-grinding process with different types of regional municipal sludge(sludge) in an orthogonal experiment. The sludge type,sludge mixing proportion, dosage of dispersant, and grinding time were tested in this study. The results show that water content and its occurrence characteristics in the sludge have primary hindering influences on slurry ability. The range of fixed-viscosity concentrations with raw wet sludge is from 50.78%to 44.40%(by weight), while the range is from 53.35% to 51.51%(by weight) with dry sludge. All of the CSSs exhibit shear-thinning behaviors with different variation trends, especially the CSSs with more than 15%(by weight) raw wet sludge in it. Adding the same proportion of raw wet sludge increases the thixotropic properties of CSSs and the highest area of thixotropy loop is 3065 Pa/s, while the highest value of dry sludge is 1798 Pa/s. Hydrophilic group plays an important role in adsorbing water and building three-dimension networks with other particles, which is the main reason for CSS properties.Therefore, the mechanism can be used to find the way for making high quality CSS.

关键词： Coal sludge slurry municipal sludge Wet-grinding process Fixed-viscosity concentration Hydrophilic groups