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Development and Application of a High-Volume Recycled Powder Solidifying Material for Waterworks Sludge
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作者 Xiang Deng Sudong Hua +4 位作者 Fan Xia Yanfang Zhang Dapeng Guo Xinxing Zhu Defei Zhu 《Journal of Renewable Materials》 SCIE EI 2022年第4期939-953,共15页
Recycled powder(RP)is produced as a by-product during the process of recycling construction and demolition(C&D)wastes,presenting a low additional value.Using RP-based solidifying material can not only improve its ... Recycled powder(RP)is produced as a by-product during the process of recycling construction and demolition(C&D)wastes,presenting a low additional value.Using RP-based solidifying material can not only improve its utilization efficiency,but also reduce the cost of commercial solidifying materials.To date,this is the best solidifying material utilized to dispose the original waterworks sludge(OWS)with high moisture contents(60%),and the product could be used to fabricate non-fired bricks.This has become a new environment-friendly technology of“using waste to treat waste”.In this paper,the influence of different particle sizes and dosages of RP on the prepared solidifying material was studied.Besides,unconfined compression strength(UCS),volume stability,chemical composition,and heat of hydration,pore structure of the solidifying material were characterized.Then,non-fired bricks were prepared by using the solidifying material,recycled aggregate,and original waterworks sludge.The UCS and softing coefficient(SC)of the non-fired bricks were evaluated.As a result,the 28-day UCS of the solidifying material with optimal(M30)was 35.40 MPa,which could reach 84.37%of Portland cement(PC).The addition of RP increased the volume stability of the solidifying material.The addition of a large amount of RP reduced the heat flux and cumulative heat release of the solidifying material,while its porosity increased.The UCS of non-fired brick(NF20)in 28 days was 15.19 MPa and the SC after 28 days was 78.35%.In conclusion,the preparation of solidifying material using RP could be a promising approach and has a great potential in disposal of original waterworks sludge. 展开更多
关键词 Recycled powder solidifying material original waterworks sludge non-fired brick unconfined compressive strength
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Foreign-funded Waterworks in China
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《China's Foreign Trade》 2001年第7期30-33,共4页
关键词 Foreign-funded waterworks in China
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Efficient production of ethyl levulinate from cassava over Al2(SO4)3 catalyst in ethanol–water system 被引量:11
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作者 Jin Tan Qiying Liu +3 位作者 Lungang Chen Tiejun Wang Longlong Ma Guanyi Chen 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2017年第1期115-120,共6页
One-pot achievement of ethyl levulinate from cassava was conducted in ethanol–water system over several simple sulfate salt catalysts. Al2(SO4)3catalyst had the best performance in synthesizing ethyl levulinate compa... One-pot achievement of ethyl levulinate from cassava was conducted in ethanol–water system over several simple sulfate salt catalysts. Al2(SO4)3catalyst had the best performance in synthesizing ethyl levulinate comparing with those of a series of sulfate salts. The highest yields of ethyl levulinate was up to 39.27% as well as 7.78% levulinate acid when cassava was catalyzed in ethanol medium by adding 10 wt% water.13C and1H NMR spectroscopic investigations confirmed that isomerization of glucose to fructose over Al2(SO4)3catalyst is an important step in producing ethyl levulinate and levulinate acid. Due to aggregations of Al3+under hydrothermal conditions, tiny amount of Al3+were detected in filtrate at the percentage of 0.32% even if in absolute water. Brønsted and Lewis acids could improve the yield of ethyl levulinate and levulinate acid by synergistic effect. All results suggested that Al2(SO4)3was a simple and efficient catalyst for ethyl levulinate and levulinate acid production. © 2016 Science Press 展开更多
关键词 Catalysts ETHANOL Plants (botany) Sulfur compounds waterworks
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Municipal sludge as landfill barrier material 被引量:8
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作者 ZHANGPeng WUZhi-chao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2005年第3期474-477,共4页
The aim of this research is to find substitute barrier materials for natural clay from two kinds of municipal sludge: waterworks sludge(S_w) and dredging sludge(S_d). Laboratory tests were performed firstly to determi... The aim of this research is to find substitute barrier materials for natural clay from two kinds of municipal sludge: waterworks sludge(S_w) and dredging sludge(S_d). Laboratory tests were performed firstly to determine their Atterberg limits and hydraulic conductivity. Based on the results, the use of waterworks sludge was recommended. Then, shear strength tests were performed and it was found the shear resistance property of waterworks sludge is strong enough to maintain slope stability. In order to evaluate the possibility of secondary pollution, the heavy metal contents of waterworks sludge was determined and the results indicated that secondary pollution is unlikely happened. Finally, economic analysis proves that reusing waterworks sludge as barrier will reduce the lost a great for both landfill and waterworks. Based on the results, waterworks sludge was proposed to use and a further long-term simulated landfill test was suggested. 展开更多
关键词 waterworks sludge dredging sludge barrier material Atterberg limits hydraulic conductivity shear strength
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Occurrence of Haloacetic Acids in Drinking Water in Certain Cities of China 被引量:7
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作者 HONGZHOU XIAO-JIANZHANG ZHAN-SHENGWANG 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2004年第3期299-308,共10页
Objective Since haloacetic acids (HAAs), which are nonvolatile and of high carcinogenic risk, are common species of chlorinated disinfection by-products(DBPs) in drinking water, and little has been known in China, it... Objective Since haloacetic acids (HAAs), which are nonvolatile and of high carcinogenic risk, are common species of chlorinated disinfection by-products(DBPs) in drinking water, and little has been known in China, it is necessary to make a survey about the kinds and levels of HAAs in drinking water of the nation. Method HAAs were analyzed using gas chromatography with electron capture detector(GC/ECD) and relatively complex pretreatment process of sample was applied. Five main cities in different areas of China were chosen in the survey. Results Studies showed that the main species of HAAs in drinking water in China were DCAA and TCAA, ranging from 0.4 礸/L to 12.85 礸/L and from 0.56 礸/L to 10.98 礸/L, respectively. MBAA and DBAA were also detected in one city, ranging from 2.20 礸/L to 4.95 礸/L and 1.10 礸/L to 2.81 礸/L, respectively. Therefore, the contents of HAAs varied, usually no more than 25 礸/L. Based on the acquired data to date, it is known that the concentrations of HAAs in drinking water in China were surely under the limits of Sanitary Standard for Drinking Water Quality (China, 2001). Conclusion A wider survey of HAAs in drinking water should be conducted throughout the nation to get adequate data and information, the ultimate aim of which is to control HAAs pollution and keep the balance between microbiological safety insurance and chemical risk control, minimize the formation of DBPs and ensure the safety of water supply at the same time. 展开更多
关键词 Haloacetic acids (HAAs) DISINFECTION Drinking water waterworks Disinfection by-products (DBPs)
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CAN远程通信总线在自来水厂供水调度中的应用
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作者 胡培 何安琴 《自动化与仪器仪表》 2011年第3期90-91,94,共3页
根据CAN远程通信总线在自来水厂供水调度中的应用实例,介绍了自来水厂远程监控的实现方法,给出了CAN总线和PLC通信的设计原则。
关键词 CAN PLC waterworks
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The management of water heritage in Portuguese cities:Recent regeneration projects in Évora,Lisbon,Braga and Guimarães 被引量:1
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作者 Celia López-Bravo JoséPeral López Eduardo Mosquera Adell 《Frontiers of Architectural Research》 CSCD 2022年第1期73-88,共16页
Given the cultural and environmental potential presented by historical water infrastructures in urban contexts,this article states the evidence of a not much documented urban phenomenon in Portugal,the refurbishment o... Given the cultural and environmental potential presented by historical water infrastructures in urban contexts,this article states the evidence of a not much documented urban phenomenon in Portugal,the refurbishment of water heritage protected areas motivated by European-based regeneration projects.By employing a case-study design,four good practices-placed inÉvora,Lisbon,Braga and Guimarães-are chosen to enlighten this growing and aware trend.The assets located there-theÁgua de Prata Aqueduct,theÁguas Livres Aqueduct,the Sete Fontes water-supply system and the Zona de Couros industrial area,respectively-are geographical,historical and culturally characterised,while the projects that concern them are documented by visiting the areas and analysing the available sources.Then,open-data platforms and heritage protection decrees are processed to graphically code the topography,hydrology,urban land use,infrastructures,landmarks and protected areas,employing QGIS free software for Geographic Information Systems.As a result,the four practices are documented,discussed and compared.A table assesses and summarises their pre-existing and currently added values and a series of diagrams illustrates the landscape changes generated.These graphics validate the practices and update the status of the assets,enhancing the rediscovery of the existing landscapes and showing the main challenges and future opportunities faced by these areas. 展开更多
关键词 Heritage characterization INFRASTRUCTURES Landscape OBSOLESCENCE Urban planning waterworks
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