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Wetlands are being degraded or lost because their ecological functions were not paid much attention. The restoration of degraded wetland ecosystems has become a focused issue in the world. Based on foreign and domestic research achievements, the effects of artificial restoration of degraded wetlands on plant communities, soil microbial communities and biogeochemical cycles of carbon and nitrogen are...
Monitoring, Reporting and Verification (MRV) of forest carbon (C) stocks, changes in these stocks (ΔC) due to land use and land use change and net greenhouse gas emissions are critical technical challenges of climate change mitigation initiatives aiming to reduce emissions from deforestation and forest degradation in developing countries (REDD). MRV systems for emission reporting for voluntary carbon...
A wireless FAEM (facility agriculture environmental monitoring) system is presented by using ZigBee and GPRS technology, and the hardware realization and software flow are given too. By means of ZigBee wireless sensor module, the method can get together much information on soil humidity, Carbon dioxide, temperature, humidity and so on. Then such information is delivered to the remote control center...
Microbe produced rhamnolipids are often mixtures containing multicomponent homologues. To understanding the rhamnolipid sorption affected by its homologue compositions is of considerable importance to its application for environmental restorations, including rhamnolipids pump-and-treat for polluted groundwater, rhamnolipids flushing to mobilize hydrophobic contaminants, as well as effects of contaminants...
In this study, we have investigated the effect of pollutants removal of a vertical multilevel soil infiltration (VMSI) system on municipal wastewater treatment. The VMSI was of 30cm*20cm*50cm column, in which combined stuffing consisted of soil, quartz sand, active carbon and scrap irons were packed. As a result, VMSI system exhibited excellent removal efficiency with 91.7% of COD, 98.4% of NH4+--N,...
In order to study the effect of fillers with adsorption and drying on rubbish degradation, leachate production and water quality of leachate, five cylinder reactors for landfill disposal were built to simulate the operation of landfill, one reactor was used as contrast reactor, no filler added in it. Saw powder, activated carbon, zleolite and newspaper were added into another four reactors. In the...
The research chose the alginate sodium and PVA as the materials to immobilize the atrazine degrading bacteria. Four methods were adopted: alginate sodium adsorption method, alginate sodium embedding method, PVA boric cross linking method and PVA freezing method. The degrading effects and the characteristics of the atrazine degrading bacteria in the two materials were studied respectively. The result...
This study focused on soil microbial activity and bacterial diversity exposed to long-term elevated CO2. Bacterial numbers, microbial biomass C, soil basal respiration, dehydrogenatase activity, and bacterial diversity were investigated in pinus koraiensis seedlings. The results indicated bacterial numbers decreased significantly (p ≤ 0.05) at elevated CO2 in July and August, but not of it in September...
Surfactants have been widely used for extracting hydrophobic organic compounds from soils into aqueous phase. Non-ionic surfactants such as Triton X-100 and anionic surfactants such as SDS (sodium dodecyl sulphate) have been of particular interest because of their high solubilizing ability and low toxicity. However, the resulting wastewater that contains both surfactant and organic contaminants should...
The resilience of earth systems depend on delicate balance of several natural cycles and phenomena. Recently, scientists have enumerated few of the significant Earth-system processes and their boundaries which should not be transgressed in order to make human activities sustainable. It was found that we have already exceeded some of the safe operating limits, which motivates the integration of bio-geochemical...
The immobilization technology could improve the degradation efficiency and adaptability of bacteria. It is a simple, accurate and safety processing method. The research use alginate sodium embedding method to fix the high efficient atrazine degrading bacteria, research the best immobilized condition of alginate sodium to the atrazine degrading bacteria, provide the theoretical basis for next research...
Microbial decontamination of petroleum-polluted soils has been recognized to be an efficient, economical and versatile alternative for physical or chemical treatments. In this study, different components of petroleum in contaminated soil were investigated under optimal environmental conditions which were determined by previous experiments. An aerobic bacteria with the ability to utilize both hydrocarbons...
Soil infiltration treatment was proved to be an effective and low-cost treatment technique for municipal wastewater in many areas. This system was intensified by combined stuffing (with zeolite, active carbon, sawdust and scrap iron) set for multilevel and named Vertical Multilevels Soil infiltration system (VMSI). Bench-scale soil column experiments were performed in laboratory to investigate effects...
Pollution property of particulates in the air and its affecting factors at the traffic crossing in Harbin were studied. PM10 in atmosphere was sampled in August 2005 near the roads of Harbin, the ions, heavy metals and carbon ingredients of PM10 were analyzed. The results showed that the proportion of the samples which didn't meet the national standard was 75%. The concentrations of SO42-, NH4+,...
This passage took soil samples from Chaohu wetland at 1.5 m buried depth. Then isolated the dominant bacteria and studied its denitrification activity under the condition of different carbon sources (methanol, ethanol and acetic acid) and C/N (3:1, 5:1, 10:1). The results suggested: (1) the nitrate removal rate of isolated strain reached 90% (named as D9); (2) under the condition of C:N was 1:1, acetic...
The response of stores of carbon in peatland to global warming is a major uncertainty in predicting the future carbon budget. We used a short-term laboratory incubation to simulate effects on the potential CO2 emission of peatland soil in Mohe, China under soil temperature (5, 10 15 and 20degC) and soil moisture (0, 30, 60, 100%WHC and completely water saturated). The rates of peat carbon mineralized...
The petroleum pollution was one of the main environmental problems to the soil and groundwater safety. Efficient remediation of contaminant soil has significance to the organic pollution control of soil and groundwater. The remediation efficiency of pulse soil venting with low air flow to the soil contaminated with diesel fuel for a long time was studied through indoor sandbox test. The concentration...
Lots of dimethoate are applied annually in world with the remainder released to environment has brought terrible contamination. Microorganisms play an important role in the biodegradation of pesticide residues in nature. Two fungal strains with dimethoate degradation capability were isolated and named as F1 and F2 after gradual adaptation and enrichment from soil. The further tests were carried out...
Renewable energy systems such as wind, solar and biomass are significantly more land intensive than traditional fossil fuels. Moreover, their environmental implications are highly geographically heterogeneous. Consequently, they present a significant challenge to existing life cycle assessment techniques. Four specific issues are identified in this paper: determining changes in land use due to increased...
Traditionally, the design of the primary undergrounded circuits for electrical distribution has been based on technical exploitation criteria, as load capacity, reliability, service quality, losses, and economical concerns as installation cost, being so achieved a compromise which minimizes the investment cost on the basis of optimizing the cable section. This procedure maintains its validity from...
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