Estimation and optimization operation in dealing with inflow and infiltration of a hybrid sewerage system in limited infrastructure facility data

doi:10.1007/s11783-017-0912-z

Front. Environ. Sci. Eng.

2017, Vol. 11

Issue (2) : 7 https://doi.org/10.1007/s11783-017-0912-z

RESEARCH ARTICLE

Estimation and optimization operation in dealing with inflow and infiltration of a hybrid sewerage system in limited infrastructure facility data

Mingkai Zhang,He Jing,Yanchen Liu(

),Hanchang Shi

State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China

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Abstract

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.

Keywords Hybrid sewerage system Wastewater treatment plant Optimization operation Inflow Infiltration

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Corresponding Author(s): Yanchen Liu

Issue Date: 17 March 2017

Cite this article:

Mingkai Zhang,He Jing,Yanchen Liu, et al. Estimation and optimization operation in dealing with inflow and infiltration of a hybrid sewerage system in limited infrastructure facility data[J]. Front. Environ. Sci. Eng., 2017, 11(2): 7.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-017-0912-z
https://academic.hep.com.cn/fese/EN/Y2017/V11/I2/7

Fig.1 Schematic of the sewer system and the Lucun WWTP (located southeast of the Wuxi City, Jiangsu Province, China). J, L, M, X, Y represents Jintang, Liqiao, Meihulu, Xianliqiao, Yonglelu pump station respectively

Fig.2 Typical variation pattern of (a) dry weather flow and wet weather flow, (b) average daily flow, (c) spectrum analysis

Fig.3 Influence of rainfall on (a) wastewater flowrate, (b) SCOD, and (c) ammonia

Tab.1 Rain-induced inflow and infiltration of representative catchments

Tab.2 ANOVA analysis of the influence of inflow and infiltration on wastewater quality fluctuation

Tab.3 Correlation analysis of rainfall with regard to wastewater quality and quantity

Fig.4 Neural network clustering and classification of 50 pumping stations

Fig.5 Comparison of influent flow rate variation of WWTP before and after optimal control scenario

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