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Taking the initial design value for target power plant as standard index values, two comprehensive benefit index systems for flue gas desulphurization (FGD) technology were formed by mean square difference method with or without the index of earning of by-product, to analyze the environmental benefit, economic benefit, technology benefit and comprehensive benefit of six flue gas desulphurization technologies on designed power plant and obtained the optimal technology ultimately. For the index system with index of earning of by-product, the optimal FGD technology is wet ammonia desulphurization, not only possesses the biggest comprehensive benefit, but also the biggest economical and technology benefit for designed power plant. For the index system without the index of earning of by-product, the wet ammonia desulphurization, limestone wet desulfurization and simple wet desulfurization have similar comprehensive benefits, but individual advantage on environmental, economic and technology benefit separately.

Combining the governance situation of the main coal gangue heap in Shanxi LuAn group, aiming at different geographical conditions and governance effect of subsidence basin water area caused by coal gangue heap and coal mining at WangZhuang coal mine, based on the concept of ecological management in mines, the paper probes into the geological environmental engineering technology of subsidence basin water area caused by coal gangue heap and coal mining. Then the article analyzes the comprehensive benefits and puts forward to the problems existing in the comprehensive treatment engineering of coal gangue heap and the corresponding solutions.

The rapid development of calcium carbide industry in Shaanxi Province have made significant achievements in the size and yield, low energy efficiency and extensive management, problems still prominent, high energy consumption high emissions and construction of ecological civilization, apparently, does not adapt. Study from two aspects of technology and management of energy saving and emission reduction in the calcium carbide industry, countermeasures for realizing clean production and sustainable development, and the benefit analysis.

The typical area in Ningbo of China was chosen to conduct the micro spray irrigation construction, and the related economic benefit was analyzed. Results showed that: 776 000 yuan would be cost to construct the micro spray irrigation project in tobacco fields with the area of 350 mu; after the micro spray irrigation program put into use, the income of the area would increase 218 500 yuan per year; the calculated EIRR was 19.5%, the calculated ENPV was 997 100 yuan, and the calculated EBCR was 1.86, from the economical angle, the project was reasonable and practicable. The results could provide the theoretical and practical basis for the widespread of micro spray irrigation project of tobacco fields.

Based on the project on F2-4 plot of Pearl River New Town in Guangzhou City, manual plastering protective layer construction technology of exterior mesh for super cross-section CFST cylinder is fully studied in this paper, the proposed new technologies of outer tube mesh and dry mesh are qualified with fast construction, energy conservation and environmental protection, low cost for later maintenance and so on. The new technology has good prospects for development and can be promoted widely.

As a renewable energy, shallow geothermal energy has received extensive concerns in China, and is regarded as an important means to relieve the pressure in energy supply, meet the greenhouse gas control obligations and establish a low-carbon economy system. In recent years, a series of policies and regulations for promoting the utilization of shallow geothermal energy has been issued. This paper firstly makes an analysis of the patterns and the growing trend of shallow geothermal energy utilization, and then establishes the analysis paradigms of the economic, environmental and social benefits of its utilization, taking Tianjin as a case. Finally, a policy system to promote the utilization of shallow geothermal energy is proposed.

The establishment of eco-industrial parks can not only reduce the costs of waste disposal and the purchase of raw materials, but also has a positive impact on both economy and environment. By setting Shanghai as an example, a model of the eco-industrial park was described and the design plan and operating procedures of the park were provided in this paper. Then the benefits of this park were discussed. It may bring about some practicable approaches for the development of China’s eco-industrial parks through a specific analysis as well as the presentation of an operating model.

Effect of the continuous development of economy and society, and changes in water regime and hydraulic structure behavior, the post-economic evaluation on water conservancy project is necessary. By which experiences and lessons can be learned from the river course regulation project under operation, project management and decision-making at all levels can be improved. At the same time, engineering under operation can play better efficiency, and the construction work in progress and projects to be built can be guided through the appraisement. It is proved by example application.

As a new kind of concrete construction technology, fair-faced concrete is still not mature and applied widely in China by present. But it was successfully used in China Qingdao Zhuoting plaza project. Its No.1 and No.2 dwelling houses are high-rise buildings with thirty-two stories and their external walls were constructed with fair-faced concrete. As it is the highest fair-faced concrete project in China with 99.95m in height and 370 days construction period through four seasons in a year, the project meets a lot of problems and challenges. So some innovative construction technologies were studied and used which make the project smoothly and successfully completed and get many significant economic, social and environmental benefits.

To solve the maintaining shortcoming of diesel engine, the remanufacturing technology idea of diesel engines is put forward and discussed preliminary. Then it summarizes the difference and processing between remanufacturing and maintenance for diesel engine, and the technical measures that may bring about economic benefits for the enterprise. Then the application perspective of remanufacturing technology for equipment diesel engines was outlooked. Notable economy benefit will be gained prolonging the service life of diesel engine.

The finite element contrast model such as concrete filled steel tube support, U-steel support and hollow steel tube support were established with ANSYS software, combining with engineering practice and relative design scheme of concrete filled steel tube test, respectively analysis their influencing factors and mechanical properties such as support effect, bearing capacity and so on. The economic benefit of each support was been analysised by comprehensive comparison of the material using condition and mechanical performance. The results show that, comparing with traditional U-steel support, retractable concrete filled steel tube support is a new style support with high bearing capacity, a large variety of sizes, higher economic benefit, and hence fit to support the deep soft rock broken jointed rock mass.

The affiliated hospital of Guiyang Medical University was the first organization using the application of sewage heat pump system to cool and heat. After its emergency building took the new sewage heat pump to replace the original geothermal heat pump, there was obvious effect on the energy saving. Compared with the previous year in which the sewage heat pump was not improved, the new sewage heat pump not only reduced the cooling and heating energy consumption costs, but also substantially reduced emissions of air pollutants. The new sewage heat pump played a very good example in the application of clean energy, and it is of great significance on the recycling economy and environmental protection.