Seasonal and treatment-process variations in invertebrates in drinking water treatment plants

doi:10.1007/s11783-020-1354-6

Front. Environ. Sci. Eng.

2021, Vol. 15

Issue (4) : 62 https://doi.org/10.1007/s11783-020-1354-6

RESEARCH ARTICLE

Seasonal and treatment-process variations in invertebrates in drinking water treatment plants

Zhiling Wu¹(

), Xianchun Tang², Hongbin Chen²(

)

¹. School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China
². School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

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Abstract

• Seasonal and treatment-process variations in invertebrates in a DWTP were analyzed.

• The propagation and leakage of invertebrates in BAC filter were the most serious.

• Invertebrates can survive and reproduce in chlorine disinfected clear water tanks.

• Proportions of endogenous invertebrates increased along the treatment process.

Problems associated with excessive propagation and leakage of invertebrates in drinking water have received increasing attention in recent years. We performed a monthly survey of invertebrate abundance and taxa in the effluent of each treatment stage in a drinking water treatment plant between May 2015 and April 2016 and analyzed seasonal and treatment-process variations in invertebrates. The results showed that invertebrate abundances in raw water, effluent of the biological activated carbon (BAC) filter, and finished water significantly correlated with water temperature, whereas no correlation was observed between water temperature and invertebrate abundance in the effluents of the sedimentation tank and sand filter. The dominant taxa in the effluent of each treatment stage were rotifers, nematodes, and crustaceans. The sedimentation tank could efficiently remove invertebrates with an annual average removal rate of 92%. The propagation and leakage of invertebrates occurred in the sand and BAC filters but more seriously in the latter. The average reproduction rate in the BAC filter was 268.8% with rotifers as the taxon that leaked the most. Invertebrate survival and reproduction were also observed in the chlorine-disinfected clean water reservoir with an average reproduction rate of 41.9%. Owing to differences in chlorine resistance, the reproduction ability of the dominant taxa was in the order nematodes>crustaceans>rotifers. The proportion of endogenous invertebrates gradually increased along the treatment process. The average proportion of endogenous invertebrates in the finished water was higher than 79.0%. Our findings suggested that waterworks should pay more attention to endogenous invertebrate growth.

Keywords Invertebrates Drinking water Seasonal variations Treatment process

Corresponding Author(s): Zhiling Wu,Hongbin Chen

Issue Date: 10 October 2020

Cite this article:

Zhiling Wu,Xianchun Tang,Hongbin Chen. Seasonal and treatment-process variations in invertebrates in drinking water treatment plants[J]. Front. Environ. Sci. Eng., 2021, 15(4): 62.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-020-1354-6
https://academic.hep.com.cn/fese/EN/Y2021/V15/I4/62

Fig.1 The treatment process used in DWTP A and sampling sites.

Fig.2 Total invertebrate abundance with water temperature in DWTP A (Data Sources: Total invertebrate abundances of filtrate of sand filter, filtrate of the BAC filter and the finished water have been used in our previous article (^{Wu&Chen, 2018})).

Tab.1 Regression analysis between the total invertebrate abundance and water temperature

Fig.3 Invertebrate proportions in the effluents of different treatment steps: (A) raw water; (B) filtrate of the sedimentation tank; (C) filtrate of the sand filter; (D) filtrate of the BAC filter; (E) finished water.

Fig.4 Annual average invertebrate abundance along the treatment process.

Fig.5 Removal efficiencies by sedimentation of: (A) total invertebrates; (B)dominant invertebrates (In January and February, the crustaceans abundances were higher in the filtrate than those in the inflow. Therefore, true removal rates could not be obtained in both months).

Fig.6 Differences in invertebrate abundance between the filtrate and inflow of: (A) sand filter; (B) BAC filter; (C) clean water reservoir.

Tab.2 Source and composition of invertebrates in the effluent of each treatment step (%, water temperature>15°C)

Tab.3 Source and composition of invertebrates in the effluent of each treatment step (%, water temperature<15°C)

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