Taking the anaerobic digestion products of sludge as the object, through the analysis on the development of garden substrate market at home and abroad and the development status of horticultural products from the anae...Taking the anaerobic digestion products of sludge as the object, through the analysis on the development of garden substrate market at home and abroad and the development status of horticultural products from the anaerobic digestion products, the direction for the utilization of the anaerobic digestion products of sludge was pointed out. Based on the demand of Chongqing’s garden market, this paper analyzed the potential utilization of sludge anaerobic digestion products in Chongqing, and briefly introduced the research status of landscaping utilization of sludge anaerobic digestion products in Chongqing, in order to provide reference for the industry.展开更多
The production of municipal sludge is huge,and the sludge contains a large quantity of organic matter and nutrient elements. In this study,the development status of sludge compost at home and abroad was briefly descri...The production of municipal sludge is huge,and the sludge contains a large quantity of organic matter and nutrient elements. In this study,the development status of sludge compost at home and abroad was briefly described,and the environmental risk of land use of sludge compost was summarized. Meanwhile,the utilization direction of sludge compost was proposed. The use of sludge compost in urban green soil and forestry soil is one of effective ways to solve the problem of municipal sludge. It also provides ideas for the disposal of domestic sludge.展开更多
Starting with the problem of poor outlet of sludge used in gardens,the basic situation and existing bottlenecks of sludge utilization in gardens were be analyzed from the aspects of products,market and talent,and then...Starting with the problem of poor outlet of sludge used in gardens,the basic situation and existing bottlenecks of sludge utilization in gardens were be analyzed from the aspects of products,market and talent,and then corresponding countermeasures were proposed,such as treating and controlling heavy metals and other pollutants in sludge based on the premise of sludge stabilization and harmless treatment,aiming to reprocess the treated product and develop diversified products,using technological innovation and talent cultivation as the key,and combining sludge treatment and product processing to take the road of product utilization. The research aims to provide reference for the treatment and disposal of sludge.展开更多
The greening situation of 242 road greenbelts in 7 administrative regions in the main urban city of Chongqing City was investigated by field survey, and the plant composition, application frequency, species richness a...The greening situation of 242 road greenbelts in 7 administrative regions in the main urban city of Chongqing City was investigated by field survey, and the plant composition, application frequency, species richness and diversity of plants used for road greening in the main urban area were analyzed. The results show that there were 105 species of plants used for road greening(not including seasonal flowers displayed temporarily) in the main urban area of Chongqing City, belonging to 80 genera, 47 families. Among them, there were 95 species of woody plants and 10 species of perennial herbs, accounting for 90.47% and 9.53% of the total number respectively. Some suggestions were put forward according to the current situation and problems of road greening in the main urban area of Chongqing City.展开更多
[Objectives] This study was conducted to analyze the current status of soil quality in Chongqing and provide scientific data for the rejuvenation of flowering cherry in the botanical park of the city. [Methods] With t...[Objectives] This study was conducted to analyze the current status of soil quality in Chongqing and provide scientific data for the rejuvenation of flowering cherry in the botanical park of the city. [Methods] With the flowering cherry soil in Chongqing Botanical Park as the research object, the typical soil in this area was investigated and improved. [Results] After applying soil conditioners, the pH value of the surface soil decreased from 7.32 to 6.34, and the pH value of the bottom soil decreased from 7.52 to 6.77;and the surface soil organic matter increased from 35.2 to 54.1 g/kg, and the bottom soil organic matter increased from 15.7 to 26.3 g/kg. [Conclusions] The soil has strong buffering capacity, and it is difficult to achieve rapid adjustment of soil pH and organic matter in actual work. Soil improvement needs to be carried out step by step. After targeted improvement, further maintenance is required in the later stage.展开更多
The production of urban sludge is huge,and the anaerobic digestion of sludge is one of the important methods for sludge treatment at home and abroad.The products of sludge digestion can be further used as resources.In...The production of urban sludge is huge,and the anaerobic digestion of sludge is one of the important methods for sludge treatment at home and abroad.The products of sludge digestion can be further used as resources.In this study,biogas slurry,as one of products of sludge digestion,was deeply treated by intermittent and continuous aeration,and the feasibility of using biogas slurry in land was discussed.Meanwhile,the processing cost was analyzed.This study can provide support for the deep utilization of sludge digestion products.展开更多
Low temperature plasma was used to treat sludge,and the effects of discharge time on the content of different forms of heavy metals in the sludge were studied. The results showed that Cu and Zn content in the domestic...Low temperature plasma was used to treat sludge,and the effects of discharge time on the content of different forms of heavy metals in the sludge were studied. The results showed that Cu and Zn content in the domestic sludge could basically meet the requirements of GB 4284-2018,GB/T 23486-2009,CJ/T 362-2011 and CJ/T 309-2009. There were big differences between different forms of the heavy metals. According to the proportions of different forms of Cu in the sludge,different forms of Cu are arranged as follows: organic state > carbonate bound state> residual state > exchangeable state > iron-manganese oxidation state,and Cu mainly existed in an organic state. Various forms of Zn are arranged in order of the proportion as follows: iron-manganese oxidation state > residual state > carbonate bound state > exchangeable state > organic state,and Zn mainly existed in an iron-manganese oxidation state. After the treatment of sludge by low temperature plasma,the content of exchangeable Cu and Zn in the sludge increased,while the content and proportion of residual Cu and Zn all reduced.展开更多
Cold plasma technology was used to treat sludge,and the effects of various discharge times on the p H,EC,content of available nutrients( available nitrogen,available phosphorus and available potassium),value of fecal ...Cold plasma technology was used to treat sludge,and the effects of various discharge times on the p H,EC,content of available nutrients( available nitrogen,available phosphorus and available potassium),value of fecal coliforms,and mortality of Ascaris lumbricoides eggs of sludge were studied. The results showed that after the treatment of sludge by cold plasma technology,it had certain effects on the p H,EC,available nitrogen and available phosphorus content of the sludge,and had no significant effect on available potassium content. Within certain discharge times,sludge p H increased,while EC,available nitrogen and available phosphorus content decreased,and there was no significant change in available potassium content. The plasma generated by discharge could effectively kill microorganisms under normal atmospheric pressure,so that the value of fecal coliforms and mortality of Ascaris lumbricoides eggs of the treated sludge could meet the requirements of the relevant standard.展开更多
Effects of dried sludge, digested sludge and composted sludge(obtained from the raw sludge of a large sewage treatment plant in Chongqing City) on the physiological characteristics of Salvia splendens, Tagetes patula ...Effects of dried sludge, digested sludge and composted sludge(obtained from the raw sludge of a large sewage treatment plant in Chongqing City) on the physiological characteristics of Salvia splendens, Tagetes patula and Petunia hybrida were studied. The results showed that the application of sludge could significantly promote the growth of three kinds of flowers and improve their quality. The effects of sludge application rate on the biological characteristics of three kinds of flowers were significant. The optimal application rate of the sludge for the growth of three kinds of flowers was 50%(mass percentage) for S. splendens and 37.5% for P. hybrida and T. patula. The effect of sludge type on the biological characteristics was not significant. However, among the three types of sludge, composted sludge had the highest organic matter content and cation exchange capacity and the lowest salt content, so the improvement of garden soil by composted sludge was relatively significant and safe.展开更多
In recent years,sewage treatment has become a common concern of cities,and proper sewage treatment will directly benefit cities by facilitating their healthy and fast development. In this study,the principles of sludg...In recent years,sewage treatment has become a common concern of cities,and proper sewage treatment will directly benefit cities by facilitating their healthy and fast development. In this study,the principles of sludge treatment and disposal such as reduction,stabilization,harmlessness,resource utilization,and low carbonization were introduced. Afterwards,the advantages and disadvantages of ways to dispose sewage were analyzed,and some new techniques were also introduced. In a word,it was advisable to treat sewage properly based on actual conditions.展开更多
基金Supported by Project "Synergistic Anaerobic Digestion Technology of Municipal Sewage Sludge and Incineration Plant Landfill Leachate and Its Productivity Test" of Chongqing Water Asset Management Co.Ltd
文摘Taking the anaerobic digestion products of sludge as the object, through the analysis on the development of garden substrate market at home and abroad and the development status of horticultural products from the anaerobic digestion products, the direction for the utilization of the anaerobic digestion products of sludge was pointed out. Based on the demand of Chongqing’s garden market, this paper analyzed the potential utilization of sludge anaerobic digestion products in Chongqing, and briefly introduced the research status of landscaping utilization of sludge anaerobic digestion products in Chongqing, in order to provide reference for the industry.
基金Supported by International Science & Technology Cooperation Program of China(2015DFR70390)International Science & Technology Cooperation Base Project of Chongqing City,China(cstc2014gjhz0001)Science and Technology Planning Project of Chongqing City,China(cstc2011pt-gc80019)
文摘The production of municipal sludge is huge,and the sludge contains a large quantity of organic matter and nutrient elements. In this study,the development status of sludge compost at home and abroad was briefly described,and the environmental risk of land use of sludge compost was summarized. Meanwhile,the utilization direction of sludge compost was proposed. The use of sludge compost in urban green soil and forestry soil is one of effective ways to solve the problem of municipal sludge. It also provides ideas for the disposal of domestic sludge.
基金Supported by International Science&Technology Cooperation Program of China(2015DFR70390)National Key Technology R&D Program(2014BAC29B01)+1 种基金Science and Technology Research and Development Base Construction Plan of Chongqing City,China(cstc2014gjhz20001)Technology Platform and Base Construction Plan of Chongqing City,China(cstc2011pt-gc80019)
文摘Starting with the problem of poor outlet of sludge used in gardens,the basic situation and existing bottlenecks of sludge utilization in gardens were be analyzed from the aspects of products,market and talent,and then corresponding countermeasures were proposed,such as treating and controlling heavy metals and other pollutants in sludge based on the premise of sludge stabilization and harmless treatment,aiming to reprocess the treated product and develop diversified products,using technological innovation and talent cultivation as the key,and combining sludge treatment and product processing to take the road of product utilization. The research aims to provide reference for the treatment and disposal of sludge.
基金Sponsored by Planning Project of Technological Platform and Base Construction of Chongqing City(cstc2011pt-gc80019)
文摘The greening situation of 242 road greenbelts in 7 administrative regions in the main urban city of Chongqing City was investigated by field survey, and the plant composition, application frequency, species richness and diversity of plants used for road greening in the main urban area were analyzed. The results show that there were 105 species of plants used for road greening(not including seasonal flowers displayed temporarily) in the main urban area of Chongqing City, belonging to 80 genera, 47 families. Among them, there were 95 species of woody plants and 10 species of perennial herbs, accounting for 90.47% and 9.53% of the total number respectively. Some suggestions were put forward according to the current situation and problems of road greening in the main urban area of Chongqing City.
基金Supported by Chongqing City Administration Bureau Science and Technology Planning Project(YKZ 2017 05)Science and Technology Platform and Base Construction of Chongqing City(cstc2014gjhz20001)Chongqing Science and Technology Planning Project(cstc2011pt-gc80019)
文摘[Objectives] This study was conducted to analyze the current status of soil quality in Chongqing and provide scientific data for the rejuvenation of flowering cherry in the botanical park of the city. [Methods] With the flowering cherry soil in Chongqing Botanical Park as the research object, the typical soil in this area was investigated and improved. [Results] After applying soil conditioners, the pH value of the surface soil decreased from 7.32 to 6.34, and the pH value of the bottom soil decreased from 7.52 to 6.77;and the surface soil organic matter increased from 35.2 to 54.1 g/kg, and the bottom soil organic matter increased from 15.7 to 26.3 g/kg. [Conclusions] The soil has strong buffering capacity, and it is difficult to achieve rapid adjustment of soil pH and organic matter in actual work. Soil improvement needs to be carried out step by step. After targeted improvement, further maintenance is required in the later stage.
基金Supported by Science and Technology Planning Project of Chongqing City,China(cstc2011pt-gc80019)
文摘The production of urban sludge is huge,and the anaerobic digestion of sludge is one of the important methods for sludge treatment at home and abroad.The products of sludge digestion can be further used as resources.In this study,biogas slurry,as one of products of sludge digestion,was deeply treated by intermittent and continuous aeration,and the feasibility of using biogas slurry in land was discussed.Meanwhile,the processing cost was analyzed.This study can provide support for the deep utilization of sludge digestion products.
基金Supported by International Science&Technology Cooperation Program of China(2015DFR70390)Science and Technology Platform and Base Construction Project of Chongqing City,China(cstc2014gjhz20001)Science and Technology Planning Project of Chongqing City,China(cstc2011pt-gc80019)
文摘Low temperature plasma was used to treat sludge,and the effects of discharge time on the content of different forms of heavy metals in the sludge were studied. The results showed that Cu and Zn content in the domestic sludge could basically meet the requirements of GB 4284-2018,GB/T 23486-2009,CJ/T 362-2011 and CJ/T 309-2009. There were big differences between different forms of the heavy metals. According to the proportions of different forms of Cu in the sludge,different forms of Cu are arranged as follows: organic state > carbonate bound state> residual state > exchangeable state > iron-manganese oxidation state,and Cu mainly existed in an organic state. Various forms of Zn are arranged in order of the proportion as follows: iron-manganese oxidation state > residual state > carbonate bound state > exchangeable state > organic state,and Zn mainly existed in an iron-manganese oxidation state. After the treatment of sludge by low temperature plasma,the content of exchangeable Cu and Zn in the sludge increased,while the content and proportion of residual Cu and Zn all reduced.
基金Supported by International Science&Technology Cooperation Program of China(2015DFR70390)Science and Technology Platform and Base Construction Project of Chongqing City,China(cstc2014gjhz20001)Science and Technology Planning Project of Chongqing City,China(cstc2011pt-gc80019)
文摘Cold plasma technology was used to treat sludge,and the effects of various discharge times on the p H,EC,content of available nutrients( available nitrogen,available phosphorus and available potassium),value of fecal coliforms,and mortality of Ascaris lumbricoides eggs of sludge were studied. The results showed that after the treatment of sludge by cold plasma technology,it had certain effects on the p H,EC,available nitrogen and available phosphorus content of the sludge,and had no significant effect on available potassium content. Within certain discharge times,sludge p H increased,while EC,available nitrogen and available phosphorus content decreased,and there was no significant change in available potassium content. The plasma generated by discharge could effectively kill microorganisms under normal atmospheric pressure,so that the value of fecal coliforms and mortality of Ascaris lumbricoides eggs of the treated sludge could meet the requirements of the relevant standard.
基金Supported by International Science&Technology Cooperation Program of China(2015DFR70390)National Key Technology R&D Program(2014BAC29B01)+1 种基金Science and Technology Platform and Base Construction Project of Chongqing City,China(cstc2014gjhz20001)Science and Technology Planning Project of Chongqing City,China(cstc2011pt-gc80019)
文摘Effects of dried sludge, digested sludge and composted sludge(obtained from the raw sludge of a large sewage treatment plant in Chongqing City) on the physiological characteristics of Salvia splendens, Tagetes patula and Petunia hybrida were studied. The results showed that the application of sludge could significantly promote the growth of three kinds of flowers and improve their quality. The effects of sludge application rate on the biological characteristics of three kinds of flowers were significant. The optimal application rate of the sludge for the growth of three kinds of flowers was 50%(mass percentage) for S. splendens and 37.5% for P. hybrida and T. patula. The effect of sludge type on the biological characteristics was not significant. However, among the three types of sludge, composted sludge had the highest organic matter content and cation exchange capacity and the lowest salt content, so the improvement of garden soil by composted sludge was relatively significant and safe.
基金Supported by Science and Technology Planning Project of Chongqing City,China(cstc2011pt-gc80019)Science and Technology Research and Development Base Construction Plan of Chongqing City,China(cstc2014gjhz20001)+1 种基金International Science&Technology Cooperation Program of China(2015DFR70390)National Special Science and Technology Project for Water Pollution Control and Management(2017ZX07403002)
文摘In recent years,sewage treatment has become a common concern of cities,and proper sewage treatment will directly benefit cities by facilitating their healthy and fast development. In this study,the principles of sludge treatment and disposal such as reduction,stabilization,harmlessness,resource utilization,and low carbonization were introduced. Afterwards,the advantages and disadvantages of ways to dispose sewage were analyzed,and some new techniques were also introduced. In a word,it was advisable to treat sewage properly based on actual conditions.
