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Estimation and optimization operation in dealing with inflow and infiltration of a hybrid sewerage system

Mingkai Zhang, He Jing, Yanchen Liu, Hanchang Shi

《环境科学与工程前沿（英文）》 2017年第11卷第2期 doi: 10.1007/s11783-017-0912-z

摘要： Inflow and infiltration of a sewage system was estimated by synthetic model. Homological feature of catchments was recognized by self-organizing map. Occurrence risk index was proposed to assess catchment operation problem. Optimal strategy was used to reduce surcharge events and improve effluent quality. Inflow and infiltration (I/I) are serious problems in hybrid sewerage systems. Limited sewerage information impedes the estimation accuracy of I/I for each system catchment because of its unknown distribution. A new method proposed to deal with I/I of a large-scale hybrid sewerage system with limited infrastructure facility data is presented in this study. The catchment of representative pump stations was adopted to demonstrate the homological catchments that have similar wastewater fluctuation characteristics. Homological catchments were clustered using the self-organizing map (SOM) analysis based on long-term daily flow records of 50 pumping stations. An assessment index was applied to describe the I/I and overflow risk of representative pump stations in the catchment based on the hourly wastewater quality and quantity data. The potential operational strategy of homological catchments was generated by the assessment index of representative pump stations. The simulation results of the potential operational strategy indicated that the optimized operation strategy could reduce surcharge events and significantly improve the quality of wastewater treatment plant effluent.

关键词： Hybrid sewerage system Wastewater treatment plant Optimization operation Inflow Infiltration

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Assessment on contaminations in sediments of an intake and the inflow canals in Taihu Lake, China

Xiaolong WANG,Shiming DING,Qi ZHANG,Weiping HU

《环境科学与工程前沿（英文）》 2015年第9卷第4期页码 665-674 doi: 10.1007/s11783-014-0701-x

摘要： As the second largest freshwater lake in China, Taihu Lake provides water supply to approximately 32 million inhabitants around the lake. However, dramatically increased pollution has threatened the safety of drinking water supply in recent years. In the present study, we investigated the contaminations of nutrients and heavy metals in the sediments of an intake and inflow canals in Gonghu Bay, Taihu Lake. Moreover, we also examined the impact of human activities on spatial distribution characteristics of contaminations. Our results showed that the intake presented relatively lower concentrations of phosphorus and nitrogen compared with inflow canals. However, the concentrations of Cr, Ni, Cu, Zn and Pb in the sediments of the intake exceeded the lowest effect level (LEL) values, indicating a potential risk to drinking water resource. In addition, the concentrations of Ni in the sediments of Tianji Canal and Jinshu Canal exceeded the severe effect level (SEL) value. More importantly, the concentrations of Cu in the sediments of Tianji Canal exceeded three times of the SEL value. Multivariate statistical analysis confirmed that the domestic sewage primarily contributed to the nutrient accumulation, and the leakage of electronic trash dominated the enrichment of metals in the sediments. Taken together, more effort should be made to ensure the security of water resources in Taihu Lake, especially for the treatment of domestic sewage and industrial wastewater.

关键词： drinking water resource nutrients heavy metals sediments Taihu Lake

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暗挖海底隧道渗流量的解析解及其应用

皇甫明,谭忠盛,王梦恕,王秀英

《中国工程科学》 2009年第11卷第7期页码 66-70

摘要：

基于复变函数保角变换的方法，在一定假设的前提下，推导了隧道周边为等水压、等水头及洞周为等水头(设注浆圈情况下)渗流量的解析解。运用所推导的渗流量计算公式，重点分析了渗流量与h/2r和渗流量与注浆圈厚度的关系。

关键词：暗挖海底隧道渗流量解析解保角变换

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人工湿地强化运行措施研究

鄢璐,王世和,钟秋爽,黄娟

《中国工程科学》 2007年第9卷第10期页码 88-90

摘要：

人工湿地是一项水质净化效果好,建造、运行费用低的生态污水处理技术。目前缺少对湿地强化条件下净化特性和氧状态的研究，制约了湿地净化效率的提高。研究了串联型人工湿地、美人蕉湿地曝气、湿地多点进水和湿地出水回流对人工湿地氧环境的改善及净化效果；结果表明湿地出水回流净化效果最明显。

关键词：人工湿地串联曝气多点进水回流

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采用分布式光纤传感技术的土坝模型渗漏监测分析

杜朝伟,王梦恕,谭忠盛

《中国工程科学》 2011年第13卷第3期页码 86-91

摘要：

海底隧道应采取堵水限排的地下水处理方式，为了研究堵水限排海底隧道围岩压力、初期支护水压力和钢拱架内力在施工阶段的变化规律，结合厦门海底隧道工程，对施工现场的围岩压力、初期支护后水压力和钢拱架内力进行实时监测。研究表明，初期支护在施工阶段有较高的安全系数，止水超前注浆和初期支护背后注浆对海底隧道非常有必要。在堵水限排情况下，通过加强注浆等工程措施，初期支护水压力可降至静水压力的1/3。通过对施工现场排水量的监测与分析，提出了排水量控制标准，厦门海底隧道软弱围岩地段的排水量应按照0.25 m³/（m·d）控制。研究成果在厦门海底隧道中得到了验证和应用。

关键词：厦门海底隧道堵水限排施工监测水压力排水量