Papers by Author: Dan Gao

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Authors: Dan Gao, Zhi Hong Wang, Gang Ren, Zhi Hong Long, Yu Li Chen
Abstract: This paper has discussed the working principle and characteristics of the new commonly used pipeline repair technology by introducing the currently commonly used pipeline repair technology. The new commonly used pipeline repair technology can be classified as two big kinds including one based on excavation and trenchless technology. When selecting the pipeline repair technology, we mainly considerate four factors: whether excavat pipeline , whether cut off the water and the time of cutting off water , the time of pipeline repair , the materials of pipeline repair, and so on . The actual situation and network features of water supply network in Fangcun district of Guangzhou are analysed , the joint repair technology strategies of water supply network which applies to Fangcun district are discussed by synthesizing the applicability, merit and demerit of new pipeline repair technology, and use these as technical reference and guidance for other similar areas .
Authors: Quan Hu, Zhi Hong Wang, Yan Guo, Dan Gao
Abstract: The research treats the lakes of the Guangzhou Higher Education Mega Center(HEMC) as the main research objects. According to the relationship of the lakes and university city drainage system,lakes are the accepter of rain and sewage.In fact, the lakes of HEMC can be divided into five categories,our researches choose the natural pond,ornamental pond , the oxidation pond as the main bodies of researches,which have a great impact on environment and people. The lakes of HEMC are not a source of drinking water. We select the phosphorus, nitrogen, COD, Fe, Mn, and ctc. as the main indexs of water quality assessment. The results of the typical sampling points are under the surface water environment quality standard for level Ⅴ. The main pollutants are TN and TP. According to the situation of the lakes, putting forward views to improve the water quality.
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