Statistical comparison of two remediation methods: Remedial nutrient solution and enhanced natural attenuation were analyzed in terms of TPH of different soil samples collected from Khana Local Government Area of Rive...Statistical comparison of two remediation methods: Remedial nutrient solution and enhanced natural attenuation were analyzed in terms of TPH of different soil samples collected from Khana Local Government Area of Rivers State, Nigeria at different locations and placed inside sample bottles labelled A to D and replicated into two, one for each of the above treatment technique. The TPH of the soil was determined using GC analyzer after solvent extraction was carried out using hexane/dichloromethane mixture. Three batches of treatment were performed on the samples at every interval of eight weeks for a duration of six months. The result obtained was analyzed using a two-way ANOVA factorial experimental design to test the significance of the various sources of variation. From the result obtained, source of variation for sample and interactions were non-significantly different from each other which means that irrespective of the number of samples analyzed or the combination of both samples and batches of treatment, they will still not be significantly different from each other. The source of variation for batch and replications were significantly different from each other and this means that irrespective of the batches of treatment applied or the number of replications (methods of treatment used), they will always be significantly different from each other. The individual comparison of each sample showed that the efficiency of the Remedial Nutrient Solution method was better than Enhanced Natural Attenuation method.展开更多
Cd contamination range of farmland soil in China is wide,which has constituted a major threat for food safety and residents' health. Via multi-year development,there are more remediation methods suitable for soil ...Cd contamination range of farmland soil in China is wide,which has constituted a major threat for food safety and residents' health. Via multi-year development,there are more remediation methods suitable for soil contaminated by Cd among the world,but some methods are only suitable for the contaminated sites and indoor research,and can not be applied in large-range contaminated farmland. We analyze the source of Cd in farmland soil. By combining farmland's characteristics,three remediation techniques( low-absorption crops plantation,soil solidification and phytoremediation) and their effects are analyzed,and the existing problems and research prospects of the above techniques are explored. The research could provide reference for restoring farmland soil contaminated by Cd in China,recovering its production function and enhancing food safety standards.展开更多
Persulfate is considered a convenient and efficient remediation agent for organic contaminated soil.However,the potential risk of sulfur into the soil remediation by persulfate remains ignored.In this study,glass bott...Persulfate is considered a convenient and efficient remediation agent for organic contaminated soil.However,the potential risk of sulfur into the soil remediation by persulfate remains ignored.In this study,glass bottles with different persulfate dosages and groundwater tables were set up to simulate persulfate remediation of organic pollutants(aniline).The results found sulfate to be the main end-product(83.0%–99.5%)of persulfate remediation after10 days.Moreover,H_(2)S accounted for 93.4%–99.4%of sulfur reduction end-products,suggesting that H_(2)S was the final fate of sulfur.H_(2)S was released rapidly after one to three days at a maximum concentration of 33.0 ppm,which is sufficient to make a person uncomfortable.According to the fitted curve results,H_(2)S concentration decreased to a safe concentration(0.15 ppm)after 20–85 days.Meanwhile,the maximum concentration of methanethiol reached 0.6 ppm.These results indicated that secondary pollution from persulfate remediation could release harmful gases over a long time.Therefore,persulfate should be used more carefully as a remediation agent for soil contamination.展开更多
This study reports the feasibility of remediation of a heavy metal (HM ) contaminated soil using tartaric acid, an environmentally-friendly extractant. Batch experiments were performed to test the factors influencing ...This study reports the feasibility of remediation of a heavy metal (HM ) contaminated soil using tartaric acid, an environmentally-friendly extractant. Batch experiments were performed to test the factors influencing remediation of the HM contaminated soil. An empirical model was employed to describe the kinet ics of HM dissolution/desorption and to predict equilibrium concentrations of HM s in soil leachate. The changes of HMs in different fractions before and after t artaric acid treatment were also investigated. Tartaric acid solution containing HMs was regenerated by chestnut shells. Results show that utilization of tartar ic acid was effective for removal of HMs from the contaminated soil, attaining 5 0%—60% of Cd, 40%—50% of Pb, 40%—50% of Cu and 20%—30% of Zn in the pH ra nge of 3.5—4.0 within 24 h. Mass transfer coefficients for cadmium (Cd) and lead (Pb) were much higher than those for copper (Cu) and zinc (Zn). Sequ ential fractionations of treated and untreated soil samples showed that tartari c acid was effective in removing the exchangeable, carbonate fractions of Cd, Zn and Cu from the contaminated soil. The contents of Pb and Cu in Fe-Mn oxide fra citon were also significantly decreased by tartaric acid treatment. One hundred milliliters of tartaric acid solution containing HMs could be regenerated by 10 g chestnut shells in a batch reactor. Such a remediation procedure indicated tha t tartaric acid is a promising agent for remediation of HM contaminated soils. H owever, further research is needed before the method can be practically used for in situ remediation of contaminated sites.展开更多
This paper presents the results of the 10-years observations for the restoration of soil-vegetation cover of oil polluted taiga landscapes of Western Siberia after remediation. The author analyses some indicators of p...This paper presents the results of the 10-years observations for the restoration of soil-vegetation cover of oil polluted taiga landscapes of Western Siberia after remediation. The author analyses some indicators of physical and chemical composition, properties of soils, the changes in species composition and correlation of ecological and biomorphological groups of species, and evaluates the changes in plant community methods of ecological bioindication. There has been revealed the influence on the direction of successional changes in environmental factors such as the situation in the macro-and-mesorelief, properties of soil and the composition of the original vegetation. There is an active oil-and-salt spread of contaminants in the soil adjacent parcels and their progressive eutrophication.展开更多
为明确焦化场地多环芳烃(PAHs)污染土壤修复技术研究现状及未来发展趋势,采用文献计量学方法统计分析了Web of Science(WoS)数据库中关于焦化场地PAHs污染土壤修复技术的文献资料,并从发文数量及其年度变化、发文国家及机构、发文作者...为明确焦化场地多环芳烃(PAHs)污染土壤修复技术研究现状及未来发展趋势,采用文献计量学方法统计分析了Web of Science(WoS)数据库中关于焦化场地PAHs污染土壤修复技术的文献资料,并从发文数量及其年度变化、发文国家及机构、发文作者、论文关键词、发文期刊以及共被引文献等方面进行分析。结果表明:WoS数据库中焦化场地PAHs污染修复技术研究型论文共419篇,近年来世界范围内该领域总体发文数量总体呈上升趋势;中国、美国和法国是该领域发文数量位居前三的国家,共计98家研究机构、1070名作者参与焦化场地PAHs污染修复领域研究;研究主要集中在自然科学领域,发文量排名前3的期刊分别是Science of The Total Envionment、Chemosphere和Environmental Science and Pollution Research;关键词分析表明,焦化场地PAHs的源解析、风险管控、修复技术将会成为未来主要研究方向。展开更多
基金the National Natural Science Foundation of China (No.20507009)the Program for New Century Excellent Talents in University (NCET) of the Ministry of Education of China,the Natural Science Foundation of Jiangsu Province for Outstanding Young Scientist (No.BK2006518)and the International Foundation for Science (No.C/3958-1).
文摘Statistical comparison of two remediation methods: Remedial nutrient solution and enhanced natural attenuation were analyzed in terms of TPH of different soil samples collected from Khana Local Government Area of Rivers State, Nigeria at different locations and placed inside sample bottles labelled A to D and replicated into two, one for each of the above treatment technique. The TPH of the soil was determined using GC analyzer after solvent extraction was carried out using hexane/dichloromethane mixture. Three batches of treatment were performed on the samples at every interval of eight weeks for a duration of six months. The result obtained was analyzed using a two-way ANOVA factorial experimental design to test the significance of the various sources of variation. From the result obtained, source of variation for sample and interactions were non-significantly different from each other which means that irrespective of the number of samples analyzed or the combination of both samples and batches of treatment, they will still not be significantly different from each other. The source of variation for batch and replications were significantly different from each other and this means that irrespective of the batches of treatment applied or the number of replications (methods of treatment used), they will always be significantly different from each other. The individual comparison of each sample showed that the efficiency of the Remedial Nutrient Solution method was better than Enhanced Natural Attenuation method.
基金Supported by Special Project of National Environmental Protection Public Interest Research,China(201109020)
文摘Cd contamination range of farmland soil in China is wide,which has constituted a major threat for food safety and residents' health. Via multi-year development,there are more remediation methods suitable for soil contaminated by Cd among the world,but some methods are only suitable for the contaminated sites and indoor research,and can not be applied in large-range contaminated farmland. We analyze the source of Cd in farmland soil. By combining farmland's characteristics,three remediation techniques( low-absorption crops plantation,soil solidification and phytoremediation) and their effects are analyzed,and the existing problems and research prospects of the above techniques are explored. The research could provide reference for restoring farmland soil contaminated by Cd in China,recovering its production function and enhancing food safety standards.
基金supported by the National Key R&D Program of China (No.2018YFC1800506)the Key R&D Program of Zhejiang Province (No.2020C03083)。
文摘Persulfate is considered a convenient and efficient remediation agent for organic contaminated soil.However,the potential risk of sulfur into the soil remediation by persulfate remains ignored.In this study,glass bottles with different persulfate dosages and groundwater tables were set up to simulate persulfate remediation of organic pollutants(aniline).The results found sulfate to be the main end-product(83.0%–99.5%)of persulfate remediation after10 days.Moreover,H_(2)S accounted for 93.4%–99.4%of sulfur reduction end-products,suggesting that H_(2)S was the final fate of sulfur.H_(2)S was released rapidly after one to three days at a maximum concentration of 33.0 ppm,which is sufficient to make a person uncomfortable.According to the fitted curve results,H_(2)S concentration decreased to a safe concentration(0.15 ppm)after 20–85 days.Meanwhile,the maximum concentration of methanethiol reached 0.6 ppm.These results indicated that secondary pollution from persulfate remediation could release harmful gases over a long time.Therefore,persulfate should be used more carefully as a remediation agent for soil contamination.
文摘This study reports the feasibility of remediation of a heavy metal (HM ) contaminated soil using tartaric acid, an environmentally-friendly extractant. Batch experiments were performed to test the factors influencing remediation of the HM contaminated soil. An empirical model was employed to describe the kinet ics of HM dissolution/desorption and to predict equilibrium concentrations of HM s in soil leachate. The changes of HMs in different fractions before and after t artaric acid treatment were also investigated. Tartaric acid solution containing HMs was regenerated by chestnut shells. Results show that utilization of tartar ic acid was effective for removal of HMs from the contaminated soil, attaining 5 0%—60% of Cd, 40%—50% of Pb, 40%—50% of Cu and 20%—30% of Zn in the pH ra nge of 3.5—4.0 within 24 h. Mass transfer coefficients for cadmium (Cd) and lead (Pb) were much higher than those for copper (Cu) and zinc (Zn). Sequ ential fractionations of treated and untreated soil samples showed that tartari c acid was effective in removing the exchangeable, carbonate fractions of Cd, Zn and Cu from the contaminated soil. The contents of Pb and Cu in Fe-Mn oxide fra citon were also significantly decreased by tartaric acid treatment. One hundred milliliters of tartaric acid solution containing HMs could be regenerated by 10 g chestnut shells in a batch reactor. Such a remediation procedure indicated tha t tartaric acid is a promising agent for remediation of HM contaminated soils. H owever, further research is needed before the method can be practically used for in situ remediation of contaminated sites.
文摘This paper presents the results of the 10-years observations for the restoration of soil-vegetation cover of oil polluted taiga landscapes of Western Siberia after remediation. The author analyses some indicators of physical and chemical composition, properties of soils, the changes in species composition and correlation of ecological and biomorphological groups of species, and evaluates the changes in plant community methods of ecological bioindication. There has been revealed the influence on the direction of successional changes in environmental factors such as the situation in the macro-and-mesorelief, properties of soil and the composition of the original vegetation. There is an active oil-and-salt spread of contaminants in the soil adjacent parcels and their progressive eutrophication.
文摘为明确焦化场地多环芳烃(PAHs)污染土壤修复技术研究现状及未来发展趋势,采用文献计量学方法统计分析了Web of Science(WoS)数据库中关于焦化场地PAHs污染土壤修复技术的文献资料,并从发文数量及其年度变化、发文国家及机构、发文作者、论文关键词、发文期刊以及共被引文献等方面进行分析。结果表明:WoS数据库中焦化场地PAHs污染修复技术研究型论文共419篇,近年来世界范围内该领域总体发文数量总体呈上升趋势;中国、美国和法国是该领域发文数量位居前三的国家,共计98家研究机构、1070名作者参与焦化场地PAHs污染修复领域研究;研究主要集中在自然科学领域,发文量排名前3的期刊分别是Science of The Total Envionment、Chemosphere和Environmental Science and Pollution Research;关键词分析表明,焦化场地PAHs的源解析、风险管控、修复技术将会成为未来主要研究方向。
