In view of the problem that uncontrollable discharge of waste gas from current non-sanitary municipal waste dumps or landfill is easily to produce explosion and cause harms to the environment,referring to treatment and utilization technologies of landfill gas at home and abroad,taking a landfill in Bao'an district,Shenzhen city as an example,the feasibility of treatment and utilization of waste landfill gas was analyzed in accordance with its gas production,characteristics and hazards,which can provide some references for design and operation of processing landfill gas.
According to Metro Line 1 Qianhai Bay depot and Metro Line 3 Henggang depot research and measurement,it is compared and analyzed that measures of vibration alleviation and noise reduction are taken. Through the comprehensive comparison of various measures of vibration alleviation and noise reduction,the corresponding measures of vibration and noise reduction are summed up,to make no effect of vibration and noise of train to run on metro depot upper property.
In order to be in compliance with the stringent discharge requirement of total phosphorus in Discharge Standard of Polluants for Municipal Wastewater Treatment Plant(GB18918-2002), the existing chemical phosphorus removal facilities of Baimang water purification project were transformed. A new facility for dosing lime and PFS was added in Pre-treatment phase, media adsorption of phosphorus removal system was added in the effluent of rapid infiltration pool. After transformation, the effluent total phosphorus basically can achieve the Ⅰ-A criteria specified in GB18918-2002.
This article mainly introduces the research progress of the influence of vibration and noise on top head estates caused by urban rail transits.The article also provides references for the initial design and construction of urban rail transit's top head estates.
With the economy booming, mining for a large number of mineral not only bring us high benefits of economic growth, but also many environmental problems. Accumulation of long-term ecological loss, newly generated damages and differences on the quantity and quality of treatment and recovery, as well as rare restraint mining activities, making ecological problems of mining area become a fundamental problem to a national, ethnic, economic development and fundamental issues of human existence. The ecological restoration of wasteland in mining area is one of the important measures to solve ecological problems, actively carry out studies is crucial. The paper discusses the negative effects of mining on the ecological environment, the research features and status quo of the ecological restoration on the wastelands at abroad or in China were analyzed. Finally, the future researches were forecasted, and several suggestions were given.
Based on the theory of landscape ecology,this study used the minimum cumulative residence model to evaluate the security pattern of Futian District in Shenzhen city. The results indicated that some problems should be solved urgently in Futian District,including the fragented landscape pattern,unestablished ecological security web,isolated ecological corridors and poor connectivity of ecological flow. To solve the above problems,the optimum measurements were conducted in this paper with constructing the ecological node and ecological corridor which would builda core,a ring,three zones and six regionsecological security pattern of Futian District. The pattern would meet the demands of the city's development,and protect the ecological process and the basic ecosystem services of urban ecosystems
Layered Double Hydroxides(LDHs) are lamellar mixed hydroxides.Many researchers started to pay attention to the LDHs for its high surface area and anion exchange capacities.And the application of the LDHs become popular.In the paper,we studied the composition,structure,synthesis,characterization and application of the LDHs.
Due to large fluctuations of water quality and quantity from the pipe network,there is a certain difficulty during process debugging in the industrial Park sewage treatment plant.From the perspective of physical and chemical process and anaerobic process and aerobic process,considerations of process debugging are discussed.In addition the paper points out that strict control of pipeline influent water quality is a prerequisite for process debugging in the industrial Park sewage treatment plant,in the meantime related measures of strict control in connection with pipeline influent water quality are listed.
The CALPUFF,an unsteady meteorological and air quality model system,was used to simulate the diffusion of pollution sources in Shenzhen and its surrounding areas based on the pollution emission,meteorological station data and air quality monitoring data in the Pearl River Delta Region in 2009,and to analyze the effects of five key pollution sources on the air quality quantitatively in Shenzhen in summer.The results showed that the concentrations of PM10 and NO2 in Shenzhen were mainly affected by local key pollution sources,accounting for about 80%,while the concentration of SO2 was affected equally by both local and surrounding key pollution sources.The results also showed that the pollution of SO2 was mainly from living,key points and power plant,while the pollution of PM10 and NO2 was mainly from traffic and road dust.
In order to ensure the stable operation in the municipal sewage treatment plant,it was discussed from the sensible design,the strict construction,the high quality of equipment procurement,the rigorous daily operation management,strengthening enforcement efforts,giving full play to the supervisory functions of the superior departments,and raising public environmental awareness,etc.In the meantime,the corresponding guarantee measures are put forward.
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