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The environmental post evaluation index system is proposed to evaluate the cascade hydropower project`s post environmental impact assessment. We also constructed an evaluation method based on Matter-element and Analytic-hierarchy coupling model (FME-AHP) to apply to the environmental impact assessment of Yuan Shui cascade hydropower stations. It can test the index system and evaluation method is scientific and validity or not. We hope we can provide some experience and reference for the environmental impact assessment of the hydropower exploitation in key river basin both in China and abroad.

This paper takes cascade hydropower station project as the research object. It puts forward an economic post project evaluation of hydropower station`s analysis framework -- "static analysis and comprehensive evaluation" based on building the evaluation index set and data envelopment analysis. This paper takes economic post project evaluation of Yuanshui cascade hydropower station as an example to verify the science and effectiveness of the analysis framework and model. The results enrich the theory and model technique of economic post project evaluation of hydropower stations.

The urgency of renovation the water mains from Malong Chemical Limited Company is analyzed. And the operation process with high density polyethylene pipe linings is described in this paper. The commentary on their respective advantages and the costs will be presented. It has been proved that the HDPE linings renovation technology has many advantages including shorter operation time, higher efficiency and lower cost with smaller and simpler operating equipments over conventional trenchless and replace pipe technology.

This article provides an overview about the microbes selecting, types of bioreactors, the treatment condition, etc. which influence the odors abatement effect. In the recent past, many highly efficiency microorganisms on the actual governance of malodorous gases have been selected and trained. Among different bioreactor configurations, biofilters, biotrickling filters and bioscrubbers are most common ones. The membrane bioreactor and the three phase fluidised bed bioreactor as new bioreactors have broad development prospects. Finally, this review also provides how to insights into future R&D needs in this area.