After the development of municipal solid waste (MSW) composting domestic and abroad was reviewed systematically, the developing restricted factors and applied difficulties of composting technologies recently in our co...
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After the development of municipal solid waste (MSW) composting domestic and abroad was reviewed systematically, the developing restricted factors and applied difficulties of composting technologies recently in our country were discussed comprehensively. The developing trend of composting research is to meet the need of rapid fermentation of MSW which has high water and organic material content. At last, the technical points and feasibilities of a new-type rapid composting process was demonstrated based on the energy-saving effect of gravity tipping rapid composting of MSW with a short period.
Based on the introduction of the working principle of oil-free scroll air compressor, the hardware and software design of the electronic control system was given with a core of enhanced 51 SCM. Introduced the temperat...
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Based on the introduction of the working principle of oil-free scroll air compressor, the hardware and software design of the electronic control system was given with a core of enhanced 51 SCM. Introduced the temperature sensor net made up of DS18B20, the realization of the AC signal acquisition method using a current transformer, and the man-machine interface consists of the digital tube array assembled by the 74LS595 and the independent type keys. The program of the electronic control system employs the work style of cyclical scan, which was developed by the C language in the Keil platform. The test results showed that the installed electronic control system can be operated reliably and trouble-free work continuously.
The advanced treatment of secondary biochemical effluent from iron and steel wastewater was treated by a Continuous Membrane Filtration (CMF)system, and the related water quality and system operation parameters in tre...
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The advanced treatment of secondary biochemical effluent from iron and steel wastewater was treated by a Continuous Membrane Filtration (CMF)system, and the related water quality and system operation parameters in treatment process was monitored and analysed. The results of experiment showed that CMF has high efficiency and stable running during the long treatment process and has a good effect on removing of COD, NTU, SS and so on, it could be used for the pretreatment process of reverse osmosis and the quality of the treated water was stable. The technology will have extensively applied in advanced treatment and reuse of iron and steel wastewater.
Vacuum preloading is one of the effective technologies for consolidating soft foundation. The consolidation mechanism of vacuum preloading is explained. Meanwhile, the computing methods of vacuum preloading are classi...
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Vacuum preloading is one of the effective technologies for consolidating soft foundation. The consolidation mechanism of vacuum preloading is explained. Meanwhile, the computing methods of vacuum preloading are classified, the advantages and disadvantages of the axial symmetry consolidation theory, the half analysis theory of horizontal movement and the three dimension value solution, are evaluated. Especially the key environmental problems of the vacuum preloading have been further investigated. In addition, on the basis of analyzing the characteristics of vacuum preloading, application prospect of vacuum preloading is predicated. Finally the environmental protection methods are provided.
This paper presented the necessary of the biomass briquette technologies in the north rural areas of China. The biomass briquette technology can be used as a pretreatment technology for the other high-efficient using ...
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This paper presented the necessary of the biomass briquette technologies in the north rural areas of China. The biomass briquette technology can be used as a pretreatment technology for the other high-efficient using straw technology, especially for the direct combustion technology. Biomass briquette has obvious advantages such as good combustion characteristics, convenience of storage and transportation. So the biomass briquette technology has broad prospects for development in north rural areas of China. The biomass briquette machine technology has gained much progress. The biomass briquette technologies are getting mature and can be promoted for engineering application in near future. And the further research is needed to reduce energy consumption and increase production rates.
This study reported the feasibility of flushing remediation of lead (Pb) contaminated soil using thiacalix[4]arenetetrasulfonate (TCAS) reagent. Batch experiments were performed to test the factors influencing remedia...
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This study reported the feasibility of flushing remediation of lead (Pb) contaminated soil using thiacalix[4]arenetetrasulfonate (TCAS) reagent. Batch experiments were performed to test the factors influencing remediation of lead (Pb) contaminated soil. The effects of pH value, initial conentration and contact time on the removal capacities of lead (Pb) by TCAS reagent had been studied. The results showed that the TCAS reagent was effective for removal of lead (Pb) from the contaminated soil, the optimum TCAS concentration is 0.7% for soil treatment, attaining 93.2% of lead (Pb) in the pH range of 11.0 within 24h.
Water shortage is a critical problem in the Yellow River Basin (YRB) of China. A serial of water allocation policy reforms on the Yellow River have been taken in the lasted 2 decades. However, because of the existing ...
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Water shortage is a critical problem in the Yellow River Basin (YRB) of China. A serial of water allocation policy reforms on the Yellow River have been taken in the lasted 2 decades. However, because of the existing operation institute of water allocation and social problems resulted from historic reasons, the water usage efficiency is too low to impact the sustainable development within the YRB. 4 main factor son the manage problems-low water productivity, low water pricing, ineffective operation institution and lack of consciousness for water law, are pointed out in this paper, and the corresponding measures are given. At last, emergency policy measures in the existing state are also proposed.
A crude oil degrading strain SY1 was isolated from the soil contaminated by crude oil. The strain SY1 could utilize crude oil as the sole carbon source. The strain was identified as a member in Zoogloea species (Zoogl...
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A crude oil degrading strain SY1 was isolated from the soil contaminated by crude oil. The strain SY1 could utilize crude oil as the sole carbon source. The strain was identified as a member in Zoogloea species (Zoogloea sp. Strain SY1). After the domestication of SY1, the biodegradation rate of crude oilcan reach 41.3% under the condition of without the addition of inorganic nutrients. Based on the experimental results, the optimal cultivation temperature, cultivation time, and the pH of the SY1 seed liquid were determined. The enzyme-catalyzed kinetic model was also established.
An effective way to boost natural gas production from low pressure gas field was introduced in the paper. The supersonic ejector used the energy of high pressure gas wells, which was generally wasted through the choke...
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An effective way to boost natural gas production from low pressure gas field was introduced in the paper. The supersonic ejector used the energy of high pressure gas wells, which was generally wasted through the choke valve, as its power supply to boost the low pressure gas production. The field experiment of the natural gas ejector was carried out, and the performance of the ejector was also presented. Moreover, the production of low pressure natural gas well was compared when the natural gas ejector was used or not. The economic analysis shows that the recovery period of the capital was less than several months.
A 3D numerical simulation model of periodic heat-transfer channel of louver fin which was used in the automobile ribbon-tubular radiator was established in this paper. The evolution of the heat convection feature and ...
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A 3D numerical simulation model of periodic heat-transfer channel of louver fin which was used in the automobile ribbon-tubular radiator was established in this paper. The evolution of the heat convection feature and the influence to the inlet and outlet pressure losses were analysed when the velocity of the inlet airflow increases. The distribution character change function along the axial line of the air side flow field and temperature field when the velocity of the inlet airflow increases were discussed in detail. It showed that the mechanism of heat transfer strengthening of the louver was that, by improving airflow direction, the sustainable development of the boundary layer was destroyed, thus the angle between the velocity vector and temperature gradient vector was decreased which improved the synergism of flow field and temperature field.
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