scholarly journals Influence of Deep-Treated Wastewater Discharge on Nitrification Activity in a Natural Reservoirs

2020 ◽  
Vol 21 (8) ◽  
pp. 146-155
Author(s):  
Nikita Radionov ◽  
Valentyna Iurchenko ◽  
Pavlo Ivanin ◽  
Oksana Melnikova
Keyword(s):  
Treated Wastewater ◽  
Wastewater Discharge ◽  
Nitrification Activity

scholarly journals Potentially Infectious Novel Hepatitis A Virus Strains Detected in Selected Treated Wastewater Discharge Sources, South Africa

Viruses ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 1468
Author(s):  
Saïd Rachida ◽  
Maureen Beatrice Taylor
Keyword(s):  
South Africa ◽  
Hepatitis A ◽  
Hepatitis A Virus ◽  
Wastewater Treatment Plants ◽  
Treated Wastewater ◽  
Wastewater Discharge ◽  
Public Health Importance ◽  
Symptomatic Disease ◽  
Before And After ◽  
Amino Acid Mutations

Hepatitis A virus (HAV) is a waterborne pathogen of public health importance. In South Africa (SA), unique HAV subgenotype IB strains have been detected in surface and wastewater samples, as well as on fresh produce at the point of retail. However, due to the use of molecular-based assays, the infectivity of the detected strains was unknown. Considering the potential shift of HAV endemicity from high to intermediate, which could increase the risk of severe symptomatic disease, this study investigated the identity of HAV strains detected before and after viability treatment of selected wastewater discharge samples. For one year, 118 samples consisting of sewage, treated wastewater discharge and downstream dam water were collected from five wastewater treatment plants (WWTP 1, 2, 3, 4 and 5). Unique HAV IB strains were detected in samples from all five WWTPs, with 11 of these strains carrying amino acid mutations at the immunodominant and neutralisation epitopes. A quasispecies dynamic of HAV has also been detected in sewage samples. The subsequent application of viability PCR revealed that potentially infectious HAV strains were discharged from WWTP 1, 2, 4 and 5 into the dam. Therefore, there is a potential risk of HAV exposure to communities using water sources downstream the WWTPs.

Possible impact of treated wastewater discharge on incidence of antibiotic resistant bacteria in river water

2001 ◽  
Vol 43 (2) ◽  
pp. 91-99 ◽  
Author(s):  
T. Iwane ◽  
T. Urase ◽  
K. Yamamoto
Keyword(s):  
Wastewater Treatment ◽  
River Water ◽  
Wastewater Treatment Plant ◽  
Treatment Process ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Resistant Bacteria ◽  
Wastewater Discharge ◽  
Wastewater Treatment Process ◽  
Antibiotic Resistant

Escherichia coli and coliform group bacteria resistant to seven antibiotics were investigated in the Tama River, a typical urbanized river in Tokyo, Japan, and at a wastewater treatment plant located on the river. The percentages of antibiotic resistance in the wastewater effluent were, in most cases, higher than the percentages in the river water, which were observed increasing downstream. Since the possible increase in the percentages in the river was associated with treated wastewater discharges, it was concluded that the river, which is contaminated by treated wastewater with many kinds of pollutants, is also contaminated with antibiotic resistant coliform group bacteria and E.coli. The percentages of resistant bacteria in the wastewater treatment plant were mostly observed decreasing during the treatment process. It was also demonstrated that the percentages of resistance in raw sewage are significantly higher than those in the river water and that the wastewater treatment process investigated in this study works against most of resistant bacteria in sewage.

Five years on: monitoring of Long Island Point’s Western Port wastewater discharge

2017 ◽  
Vol 57 (1) ◽  
pp. 10
Author(s):  
Melanie Bok ◽  
Scott Chidgey ◽  
Peter Crockett
Keyword(s):  
Long Island ◽  
Marine Ecosystem ◽  
Environmental Indicators ◽  
Treated Wastewater ◽  
Far Field ◽  
Mixing Zone ◽  
Environment Protection ◽  
Wastewater Discharge ◽  
Oil Storage ◽  
Environmental Objectives

The Esso Long Island Point facility is situated on the edge of Western Port, an important Ramsar designated wetland for migratory birds in Victoria, Australia. The gas fractionation and crude oil storage facility has operated for over 40 years and has discharged treated wastewater to Western Port for most of these years in accordance with its environmental regulatory licence. The 2003 State Environment Protection Policy for Waters of Western Port is the Victorian Environment Protection Authority’s regulatory framework for licensing wastewater discharges to the wetland, and among other items, requires that discharges must cause no ‘detrimental change in the environmental quality of the receiving waters’ or ‘chronic impacts outside any declared mixing zone’. A major upgrade to the water treatment facility in 2010 included a risk-based marine ecosystem program to monitor key environmental indicators including water quality, jetty pile invertebrate communities and seagrass condition. The program’s longer-term monitoring record has allowed assessment of potential chronic effects on invertebrates and seagrass by comparing temporal changes at monitoring sites over the period from pre-operations (2010) to present (2016) and spatial changes between near-field to far-field sites, kilometres from the discharge point. The program has shown that management of the discharge maintains beneficial uses and environmental objectives at the boundary of the mixing zone, and the marine ecosystem is protected from potentially slower and longer-term adverse effects in the far-field. The program demonstrates that the treated wastewater discharge has had no adverse impact on key environmental indicators in Western Port over the longer-term study period.

Treatment Mechanisms and Operation Conditions of Arsenic Removal from Copper Smelting Effluent Using Combined Process of Aeration Micro-Electrolysis and Flocculation

2012 ◽  
Vol 610-613 ◽  
pp. 2307-2318
Author(s):  
Yu Qi Liu ◽  
Yue Bin Feng ◽  
Xin Ying Wang ◽  
Jing Wang ◽  
Xiao Jun Xu
Keyword(s):  
High Efficiency ◽  
Arsenic Removal ◽  
Arsenic Concentration ◽  
Effluent Treatment ◽  
Treated Wastewater ◽  
Copper Smelting ◽  
Wastewater Discharge ◽  
Combined Process ◽  
Operation Conditions ◽  
Treatment Mechanisms

An effective combined process of aeration micro-electrolysis and flocculation was utilized to treat arsenic that incoming contaminate level was 153 mgL-1 from the metallurgical effluent. Treatment mechanisms and operation conditions were discussed which influenced the removal efficiency of arsenic. Under the optimal technological conditions, it was found that the removal efficiencies of COD and As were 92.5% and 99.7% respectively. The remain arsenic concentration in the treated wastewater was only 0.43mgL-1 and met National Wastewater Discharge Standard(GB8978-1996) in China. Analysis by SEM and EDS revealed that using combined process, most of As(III) could be oxidized to As(V), which led to the high efficiency of arsenic removal. In the meantime, most of other heavy metals, such as Cu, Pb and Ni, had been removed. Therefore, the combined process is regarded as a promising technology in the treatment of arsenic from copper smelting effluent. It has bright future in application.

scholarly journals Metagenomics-based evaluation of groundwater microbial profiles in response to treated wastewater discharge

2020 ◽  
Vol 180 ◽  
pp. 108835 ◽  
Author(s):  
Noor Zaouri ◽  
Muhammad Raihan Jumat ◽  
Tariq Cheema ◽  
Pei-Ying Hong
Keyword(s):  
Treated Wastewater ◽  
Wastewater Discharge

scholarly journals Localized effect of treated wastewater effluent on the resistome of an urban watershed

GigaScience ◽  
2020 ◽  
Vol 9 (11) ◽  
Author(s):  
Christopher N Thornton ◽  
Windy D Tanner ◽  
James A VanDerslice ◽  
William J Brazelton
Keyword(s):  
Antibiotic Resistance ◽  
Wastewater Treatment ◽  
Resistance Genes ◽  
Fecal Contamination ◽  
Antibiotic Resistance Genes ◽  
Wastewater Effluent ◽  
Treated Wastewater ◽  
Urban Watershed ◽  
Wastewater Discharge ◽  
Treated Effluent

Abstract Background Wastewater treatment is an essential tool for maintaining water quality in urban environments. While the treatment of wastewater can remove most bacterial cells, some will inevitably survive treatment to be released into natural environments. Previous studies have investigated antibiotic resistance within wastewater treatment plants, but few studies have explored how a river’s complete set of antibiotic resistance genes (the “resistome") is affected by the release of treated effluent into surface waters. Results Here we used high-throughput, deep metagenomic sequencing to investigate the effect of treated wastewater effluent on the resistome of an urban river and the downstream distribution of effluent-associated antibiotic resistance genes and mobile genetic elements. Treated effluent release was found to be associated with increased abundance and diversity of antibiotic resistance genes and mobile genetic elements. The impact of wastewater discharge on the river’s resistome diminished with increasing distance from effluent discharge points. The resistome at river locations that were not immediately downstream from any wastewater discharge points was dominated by a single integron carrying genes associated with resistance to sulfonamides and quaternary ammonium compounds. Conclusions Our study documents variations in the resistome of an urban watershed from headwaters to a major confluence in an urban center. Greater abundances and diversity of antibiotic resistance genes are associated with human fecal contamination in river surface water, but the fecal contamination effect seems to be localized, with little measurable effect in downstream waters. The diverse composition of antibiotic resistance genes throughout the watershed suggests the influence of multiple environmental and biological factors.

scholarly journals Structure and Composition of Mangrove Associations in Tubli Bay of Bahrain as Affected by Municipal Wastewater Discharge and Anthropogenic Sedimentation

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Kholoud Abou Seedo ◽  
Mohammad S. Abido ◽  
Ahmed Salih ◽  
Asma Abahussain
Keyword(s):  
Municipal Wastewater ◽  
Basal Area ◽  
Floristic Composition ◽  
Dilution Effect ◽  
Google Earth ◽  
Treated Wastewater ◽  
Favorable Effect ◽  
Wastewater Discharge ◽  
Area Index ◽  
Mangrove Trees

The effects of municipal wastewater discharge and anthropogenic sedimentation on the structure and composition of gray mangrove (Avicennia marina (Forsk.) Vierh.) communities along Tubli Bay coastlines in Bahrain were investigated. Growth and regeneration of mangrove were measured, and its community was characterized. Sediment profile was analyzed for texture, pH, and salinity. Mangrove area covered by sand depositions was measured using Google Earth Pro. ANOVA and regression tests were employed in the analysis of the data. Results indicated that mangrove overwhelmingly dominated plant community in the study area, which was zoned by a community of other salt-tolerant species. Three main habitats exist in the study area with high similarity in their floristic composition. Species richness and the number of habitats were low due to the aridity and high sediment salinity. The dilution effect of the secondary treated wastewater had a favorable effect on height and diameters of mangrove trees. However, no differences were observed in leaf area index, basal area, and density of mangrove. The long-term accumulation of anthropogenic sedimentation had a detrimental effect on the mangrove community, expressed in swath death of mangrove trees due to root burials and formation of high topography within the community boundaries.

scholarly journals Studies of heavy metal content in bottom sediments and aquatic plants near treated wastewater discharge

2017 ◽  
Vol 43 (4) ◽  
pp. 311
Author(s):  
Mirosław Skorbiłowicz ◽  
Elżbieta Skorbiłowicz ◽  
Urszula Tarasiuk ◽  
Mariola Falkowska
Keyword(s):  
Heavy Metal ◽  
Bottom Sediments ◽  
Aquatic Plants ◽  
Metal Content ◽  
Heavy Metal Content ◽  
Treated Wastewater ◽  
Wastewater Discharge

scholarly journals Experimental study on using commercial membranes for treatment of wastewater generated by collagen production

2019 ◽  
pp. 50-55
Author(s):  
Mirela Alina Constantin ◽  
Lucian Alexandru Constantin ◽  
Ion Viorel Patroescu ◽  
Gheorghe Batrinescu
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
The Other ◽  
Treated Wastewater ◽  
Biological Processes ◽  
Wastewater Discharge ◽  
Organic Loading ◽  
Membrane Processes ◽  
Collagen Production ◽  
Valuable Compounds

Collagen production is generating wastewater with high organic loading. This type of wastewater is still containing valuable compounds that can be reused in other applications. In order to investigate the possibility to recover and reuse these compounds the membrane based processes were investigated. Four types of commercial available membranes were characterised and then used to recover the proteins. The results proved that membrane based processes represent a viable alternative to treatment of wastewater generated by collagen production facilities when recovery of valuable compounds is envisaged. It has to be stressed that on the other hand only membrane processes do not assure too reach the quality norms imposed by the legislation for treated wastewater discharge into sewerage systems or natural receivers. Therefore, when proteins recovery and reuse is wanted, the membrane processes represent only the first step of wastewater treatment and should be followed by biological processes in order to obtain the organic loading quality indicators required for wastewater treatment plants discharges.

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