Municipal wastewater effluent affects fish communities: A multi-year study involving two wastewater treatment plants

Rainfall diminution in the last years has entailed water scarcity in plenty of European regions, especially in Mediterranean areas. As a consequence, regional water authorities have enhanced wastewater reclamation and reuse. Thus, the implementation of tertiary treatments has become of paramount importance in the municipal wastewater treatment plants (WWTP) of Valencian Region (Spain). Conventional tertiary treatments consist of a physico-chemical treatment of the secondary effluent followed by sand filtration and UV radiation. However, the addition of coagulants and flocculants sometimes does not contribute significantly in the final water quality. In this work, results of 20-months operation of three WWTP in Valencian Region with different tertiary treatments (two without chemicals addition and another with chemicals addition) are discussed. Besides, experiments with a 2 m3/h pilot plant located in the WWTP Quart-Benager in Valencia were performed in order to evaluate with the same secondary effluent the effect of the chemicals addition on the final water quality. Results showed that the addition of chemicals did not improve the final water quality significantly. These results were observed both comparing the three full scale plants and in the pilot plant operation.

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Nanofiltration of endocrine disrupting compounds

Water Science & Technology Water Supply ◽

10.2166/ws.2003.0184 ◽

2003 ◽

Vol 3 (5-6) ◽

pp. 321-327 ◽

Cited By ~ 2

Author(s):

M. Gallenkemper ◽

T. Wintgens ◽

T. Melin

Keyword(s):

Wastewater Treatment ◽

Municipal Wastewater ◽

Wastewater Treatment Plants ◽

Endocrine Disrupting Compounds ◽

Municipal Wastewater Treatment ◽

Water And Wastewater Treatment ◽

Wide Range ◽

Endocrine Disrupting ◽

Municipal Wastewater Treatment Plants ◽

Set Up

Endocrine disrupting compounds can affect the hormone system in organisms. A wide range of endocrine disrupters were found in sewage and effluents of municipal wastewater treatment plants. Toxicological evaluations indicate that conventional wastewater treatment plants are not able to remove these substances sufficiently before disposing effluent into the environment. Membrane technology, which is proving to be an effective barrier to these substances, is the subject of this research. Nanofiltration provides high quality permeates in water and wastewater treatment. Eleven different nanofiltration membranes were tested in the laboratory set-up. The observed retention for nonylphenol (NP) and bisphenol A (BPA) ranged between 70% and 100%. The contact angle is an indicator for the hydrophobicity of a membrane, whose influence on the permeability and retention of NP was evident. The retention of BPA was found to be inversely proportional to the membrane permeability.

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Experience from 10 Years Advanced Wastewater Treatment – Technology and Results

Water Science & Technology ◽

10.2166/wst.1982.0053 ◽

1982 ◽

Vol 14 (1-2) ◽

pp. 121-133

Author(s):

C Forsberg ◽

B Hawerman ◽

B Hultman

Keyword(s):

Wastewater Treatment ◽

Urban Population ◽

Municipal Wastewater ◽

Wastewater Treatment Plants ◽

Municipal Wastewater Treatment ◽

Treatment Technology ◽

Removal Efficiencies ◽

Municipal Wastewater Treatment Plants ◽

Operational Modes ◽

Polluted Waters

Experience from advanced municipal wastewater treatment plants and recovery of polluted waters are described for the last ten years in Sweden. Except in municipalities with large recipients, the urban population is served by treatment plants with combined biological and chemical treatment. Most of these plants are post-precipitation plants. Several modified operational modes have been developed in order to improve the removal efficiencies of pollutants and to reduce the costs. Results are presented on the recovery of specially investigated lakes with a lowered supply of total phosphorus and organic matter.

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Repurposing hydrolysis acidification tank in municipal wastewater treatment plants for sludge reduction and biological nutrient removal

Chemical Engineering Journal ◽

10.1016/j.cej.2020.125327 ◽

2020 ◽

Vol 396 ◽

pp. 125327 ◽

Cited By ~ 2

Author(s):

Jie Jiang ◽

Zhen Zhou ◽

Jing Huang ◽

Xiaodan Zhao ◽

Xiao Sun ◽

...

Keyword(s):

Wastewater Treatment ◽

Nutrient Removal ◽

Municipal Wastewater ◽

Wastewater Treatment Plants ◽

Biological Nutrient Removal ◽

Sludge Reduction ◽

Municipal Wastewater Treatment ◽

Hydrolysis Acidification ◽

Municipal Wastewater Treatment Plants

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Occurrence of SARS-CoV-2 RNA in Six Municipal Wastewater Treatment Plants at the Early Stage of COVID-19 Pandemic in The United States

Pathogens ◽

10.3390/pathogens10070798 ◽

2021 ◽

Vol 10 (7) ◽

pp. 798

Author(s):

Samendra P. Sherchan ◽

Shalina Shahin ◽

Jeenal Patel ◽

Lauren M. Ward ◽

Sarmila Tandukar ◽

...

Keyword(s):

United States ◽

Wastewater Treatment ◽

Municipal Wastewater ◽

Wastewater Treatment Plants ◽

Quantitative Polymerase Chain Reaction ◽

The United States ◽

Secondary Effluent ◽

Untreated Wastewater ◽

Treatment Processes ◽

Wastewater Samples

In this study, we investigated the occurrence of Severe Acute Respiratory Syndrome Coronavirus-2 (SARS-CoV-2) RNA in primary influent (n = 42), secondary effluent (n = 24) and tertiary treated effluent (n = 34) collected from six wastewater treatment plants (WWTPs A–F) in Virginia (WWTP A), Florida (WWTPs B, C, and D), and Georgia (WWTPs E and F) in the United States during April–July 2020. Of the 100 wastewater samples analyzed, eight (19%) untreated wastewater samples collected from the primary influents contained SARS-CoV-2 RNA as measured by reverse transcriptase quantitative polymerase chain reaction (RT-qPCR) assays. SARS-CoV-2 RNA were detected in influent wastewater samples collected from WWTP A (Virginia), WWTPs E and F (Georgia) and WWTP D (Florida). Secondary and tertiary effluent samples were not positive for SARS-CoV-2 RNA indicating the treatment processes in these WWTPs potentially removed SARS-CoV-2 RNA during the secondary and tertiary treatment processes. However, further studies are needed to understand the log removal values (LRVs) and transmission risks of SARS-CoV-2 RNA through analyzing wastewater samples from a wider range of WWTPs.

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