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Jiang L.,Beijing Municipal Research Institute of Environmental Protection | Jiang L.,National Engineering Research Center for Urban Environmental Pollution Control | Zhong M.-S.,Beijing Municipal Research Institute of Environmental Protection | Zhong M.-S.,National Engineering Research Center for Urban Environmental Pollution Control | And 11 more authors.
Huanjing Kexue/Environmental Science | Year: 2012

The carcinogenic risk originated from benzene in contaminated groundwater of a large-scale coke plant in Beijing was analyzed and assessed for different land use zones according to the site redevelopment plan. The results revealed that indoor vapor inhalation was the key exposure pathway for all the three zones. The carcinogenic risk in zone A as commercial area was 6.37×10-8, below the maximum allowable level (1.0×10-6), but was 2.20×10-4 in zone B as industrial park and 7.49×10-5 in zone C as residential/commercial area, both beyond the acceptable level. Further, the remediation target for benzene was calculated at 118 μg·L-1 and the corresponding remediation area was contoured to be 165 000 m2.Given the high permeability of the aquifer and the excellent volatility of benzene, air-sparging with a combination of engineering control measure was recommended to mitigate the risk of the groundwater contamination. Source


Jiang L.,Beijing Municipal Research Institute of Environmental Protection | Jiang L.,National Engineering Research Center for Urban Environmental Pollution Control | Jiang L.,Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites | Zhang L.-N.,Beijing Municipal Research Institute of Environmental Protection | And 15 more authors.
Research of Environmental Sciences | Year: 2013

Two statistical methods, t-test analysis using replicate samples and upper confidence limit (UCL), were applied in evaluation of attainment of cleanup standards in a site remediation contaminated by the heavy metal. The results showed that the site did not reach the remediation goals by eight arsenic samples and one mercury sample exceeding the cleanup standards, if the strict no exceedance rule is applied. The t-test analysis using replicate samples further indicated that exceedance of As content in S48 soil sample and Hg content in S1 soil sample were contributed by the field sampling or laboratory errors, hence Hg content meet the cleanup. The 95% upper confidence limits of As and Hg were respectively calculated as 23.81 and 5.83 mg/kg, which were below the remediation goals. However, the S26 surrounding could not reach the remediation goals since As content in S26 soil sample was two times greater than the cleanup standard. The results are listed as follows: 1) The potential saving in remediation cost can reach by using statistical analysis in evaluation of attainment of cleanup standards for contaminated site remediation. 2) The traditional one by one observation comparison method is appropriate for small sites with limited samples. T-test analysis using replicate samples can be used for evaluating errors possible contributed from laboratory and filed sampling. 3) Upper confidence limit (UCL) can be applied to verify the attainment of the cleanup standard for large sites with more samples in conjunction with specific guidelines: 95%UCL is less than the remediation goals; the maximum concentrations not more than 2 times of the cleanup standard; exceedance area is discontinuous. Source


Liang K.-Q.,Beijing Municipal Research Academy of Environmental Protection | Liang K.-Q.,National Engineering Research Center for Urban Environmental Pollution Control | Xiong Y.,Beijing Municipal Research Academy of Environmental Protection | Xiong Y.,National Engineering Research Center for Urban Environmental Pollution Control | And 7 more authors.
Huanjing Kexue/Environmental Science | Year: 2012

Based on high SS/BOD and low C/N ratio of waste water of municipal wastewater treatment plant, the structure of currently existing hydrolysis reactor was reformed to improve the influent quality. In order to strengthen the sludge hydrolysis and improve effluent water quality, two layers water distributors were set up so that the sludge hydrolysis zone was formed between the two layers distribution. For the purpose of the hydrolysis reactor not only plays the role of the primary sedimentation tank but also improves the effluent water biodegradability, input water ratios of the upper and lower water distributor in the experiment were changed to get the best input water ratio to guide the large-scale application of this sort hydrolysis reactor. Results show, four kinds of input water ratio have varying degrees COD and SS removal efficiency, however, input water ratio for 1:1 can substantially increase SCOD/COD ratio and VFA concentration of effluent water compared with the other three input water ratios. To improve the effluent biodegradability, input water ratio for 1:1 was chosen for the best input water ratio. That was the ratio of flow of upper distributor was 50%, and the ratio of the lower one was 50%, at this case it can reduce the processing burden of COD and SS for follow-up treatment, but also improve the biodegradability of the effluent. Source


Li A.,Beijing Municipal Research Institute of Environmental Protection | Li A.,National Engineering Research Center for Urban Environmental Pollution Control | Luo J.,Beijing Municipal Research Institute of Environmental Protection | Luo J.,National Engineering Research Center for Urban Environmental Pollution Control | And 5 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

The condensate from sludge drying has been greatly increased with the rapid increase of sludge production in China. However, biological treatment technology suitable for the condensate is still in its infancy due to its little-known water quality characteristics. In this study, water quality characteristics of the condensate from conductive sludge drying were investigated and some specific suggestions for its biological treatment were offered. The results showed that pH value of the condensate was about 5.3, and the concentrations of NH4 +-N, volatile fatty acids (VFA), and COD were (1 130±320)mg/L, (6 840±1 150)mg/L, and (13 810±3 280)mg/L, respectively. Therefore, the condensate was considered to be a kind of high concentration organic and ammonia nitrogen wastewater. Meantime, the condensate was found to be severely lack of macro elements and trace elements, which significantly affected the metabolism and settleability of activated sludge in the biological treatment system. When it was added with the macro and trace elements or adjusted by domestic sewage, the activated sludge settleability could be improved obviously. ©, 2015, Science Press. All right reserved. Source


Wang Y.-G.,Beijing Municipal Research Academy of Environmental Protection | Wang Y.-G.,National Engineering Research Center for Urban Environmental Pollution Control | Wang X.,Beijing Municipal Research Academy of Environmental Protection | Wang X.,National Engineering Research Center for Urban Environmental Pollution Control | And 3 more authors.
Chinese Journal of Applied Ecology | Year: 2015

IPAT model and its variants could describe the quantitative relationships between human driving force and the environmental pressure, benefit fundamental understanding of the dynamics of coupled human and natural systems, and are regarded as effective tools in solving the environmental problems caused by the social and economic development. In this paper, the fundamental concepts of IPAT model and its variants were discussed including definitions, historical developments and the hot issues in their applications. The future research trends were put forward aiming to further expand the use of IPAT models in the sustainable development of environment and social decision-making. ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved. Source

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