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Zhang Y.,Tsinghua University | Chen L.,Tsinghua University | Chen L.,Yangtze University | Sun R.,Peking University | And 4 more authors.
Applied Microbiology and Biotechnology | Year: 2015

Under the increasing pressure of human activities, Hangzhou Bay has become one of the most seriously polluted waters along China’s coast. Considering the excessive inorganic nitrogen detected in the bay, in this study, the impact of an effluent from a coastal industrial park on ammonia-oxidizing microorganisms (AOMs) of the receiving area was interpreted for the first time by molecular technologies. Revealed by real-time PCR, the ratio of archaeal amoA/bacterial amoA ranged from 5.68 × 10−6 to 4.79 × 10−5 in the activated sludge from two wastewater treatment plants (WWTPs) and 0.54–3.44 in the sediments from the effluent receiving coastal area. Analyzed by clone and pyrosequencing libraries, genus Nitrosomonas was the predominant ammonia-oxidizing bacteria (AOB), but no ammonia-oxidizing archaea (AOA) was abundant enough for sequencing in the activated sludge from the WWTPs; genus Nitrosomonas and Nitrosopumilus were the dominant AOB and AOA, respectively, in the coastal sediments. The different abundance of AOA but similar structure of AOB between the WWTPs and nearby coastal area probably indicated an anthropogenic impact on the microbial ecology in Hangzhou Bay. © 2015, Springer-Verlag Berlin Heidelberg.

Bian J.,Nankai University | Bai H.,Nankai University | Li W.,Nankai University | Yin J.,Rural Energy and Environment Agency | Xu H.,Nankai University
Journal of Cleaner Production | Year: 2016

The number of waste mobile phones (WMPs) has increased dramatically in recent years. A complete recycling network is being developed in China, and the WMP recycling process will need to be industrialized. WMPs are valuable, but the potential environmental pressures resulting from recycling processes are currently not well understood. Three recycling scenarios were constructed to represent different current WMP treatment methods, and life-cycle assessments of the environmental impacts of the scenarios were performed. All three scenarios offered environmental benefits, but the scale of the benefits decreased in the order scenario 3 > scenario 2 > scenario 1. Recycling printed circuit boards and metals in the lithium batteries, possible because of the modularization process, was most environmentally beneficial. Environmental impacts were divided into 10 subcategories: recycling decreased the impacts of acidification and nitrification, carcinogenic effects, climate change, ecotoxicity, fossil fuel use, inorganic respiratory effects, and mineral effects more than the impacts of the other categories. The industrialization of WMP recycling should be based on a "manual disassembly plus modularized recycling" model (scenario 3). These results will allow decision-makers involved in the disposal of WMPs to improve the efficiency with which resources (including energy) can be recycled from WMPs. © 2016 Elsevier Ltd.

Jiang L.,Chinese Academy of Agricultural Sciences | Zhang H.-B.,Rural Energy and Environment Agency | Li G.,Chinese Academy of Agricultural Sciences | Chen B.-R.,Chinese Academy of Agricultural Sciences
Sensor Letters | Year: 2014

Time-series MODIS NDVI datasets for 2000-2009 were used in this study to investigate the characteristics of spatial-temporal changes in annual NDVImax for six typical grassland types, i.e., up-land meadows, low-land meadows, temperate meadow steppes, temperate steppes, desert steppes, and steppe deserts of the Xilingol grasslands, in Inner Mongolia, China. The analysis focused on the spatial change trends, the standard deviations and the occurrence time points of annual NDVImax for 2000-2009. The results indicated that too much utilization pressure has been put on the eastern research area, including up-land meadows, low-land meadows, temperate meadow steppes and the south and north parts of the temperate steppes; the work of vegetation protection and restoration has been remarkable in the central research area, including part of the desert steppe and the temperate steppe, and the changes in different types of grassland had been stable in total biomass. In terms of the changes in grassland areas over different grades, areas with annual NDVImax values in (0.1, 0.2], (0.6, 0.7] decreased, and areas with annual NDVImax values in (0.2, 0.6] increased for the study period. Insofar as space is concerned, deteriorating grasslands account for about 6.79% of the total area; restoring grasslands takes up 9.34%, Furthermore, there is about 82.14% of grassland where the annual NDVImax occurs between the 193rd day and the 241st day in each year, indicating that this period is the most important growing season for Xilingol grasslands. Copyright © 2014 American Scientific Publishers.

Li W.,Nankai University | Bai H.,Nankai University | Yin J.,Nankai University | Yin J.,Rural Energy and Environment Agency | Xu H.,Nankai University
Journal of Cleaner Production | Year: 2016

The sharp increase in car ownership that has occurred in China in recent years has led to a rapid increase in the number of end-of-life vehicles (ELVs). Life cycle analysis, in terms of the environmental impact and the ability to recycle and recover resources, was performed on a whole car in this study. Three scenarios were used to represent different technological levels of recycling ELVs. The major environmental impact of the ELV recycling system in China was found to be the human toxicity potential. It was found that recycling automotive shredder residues (ASRs), glass, plastic, wire harnesses, and various metal components during ELV recycling would decrease the amounts of raw materials and energy consumed in China. Moreover, it was found that decreasing the amount of energy consumed by recycling materials and remanufacturing engines would decrease pollutant emissions in China. The analysis showed that improving the engine remanufacturing, the recovery of nonmetallic materials and recycling ASRs would effectively improve the recovery of resources and increase the environmental benefits. Measures are proposed that the ELV recycling industry in China should take to decrease the environmental impact. © 2016 Elsevier Ltd.

Wang S.,China University of Geosciences | Wu W.,China Institute of Water Resources and Hydropower Research | Wu W.,Engineering Technology Research Center Explor Utiliz Non Conventional Water Rsrc Water Use Efficiency | Liu F.,China University of Geosciences | And 4 more authors.
Journal of Contaminant Hydrology | Year: 2015

Seen as a solution to water shortages, wastewater reuse for crop irrigation does however poses a risk owing to the potential release of organic contaminants into soil and water. The frequency of detection (FOD), concentration, and migration of nonylphenol (NP) isomers in reclaimed water (FODRW), surface water (FODSW), and groundwater (FODGW) were investigated in a long-term wastewater irrigation area in Beijing. The FODRW, FODSW and FODGW of any or all of 12 NP isomers were 66.7% to 100%, 76.9% to 100% and 13.3% to 60%, respectively. The mean (± standard deviation) NP concentrations of the reclaimed water, surface water, and groundwater (NPRW, NPSW, NPGW, repectively) were 469.4 ± 73.4 ng L- 1, 694.6 ± 248.7 ng- 1 and 244.4 ± 230.8 ng- 1, respectively. The existence of external pollution sources during water transmission and distribution resulted in NPSW exceeding NPRW. NP distribution in groundwater was related to the duration and quantity of wastewater irrigation, the sources of aquifer recharge, and was seen to decrease with increasing aquifer depth. Higher riverside infiltration rate nearby leads to higher FODGW values. The migration rate of NP isomers was classified as high, moderate or low. © 2015 Elsevier B.V. All rights reserved.

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