scholarly journals Municipal wastewater can result in a dramatic decline in freshwater fishes: a lesson from a developing country

2018 ◽  
pp. 37 ◽  
Author(s):  
Shams M. Galib ◽  
A.B.M. Mohsin ◽  
Md. Taskin Parvez ◽  
Martyn C. Lucas ◽  
Nipa Chaki ◽  
...  
Keyword(s):  
Species Richness ◽  
Municipal Wastewater ◽  
Primary Treatment ◽  
Fish Abundance ◽  
Wastewater Management ◽  
Wastewater Discharge ◽  
Untreated Wastewater ◽  
Dramatic Decline ◽  
Downstream Reach ◽  
Treatment Facilities

Impacts of ineffective wastewater management on the biodiversity of receiving waters in developing countries are poorly documented. Using a before-after-control-impact methodology, we measured the effects of untreated wastewater release on the fish community in the Barnoi River, Bangladesh. In 2006, prior to untreated wastewater discharge, fish abundance, species richness and water quality were similar across sampling sites. In 2016, after 8 years of wastewater release to the downstream reach, fish abundance and species richness were reduced by >47% and >35% respectively at downstream sites compared to unaffected upstream sites and >51% and >41% lower respectively compared to the pre-wastewater discharge period. The wastewater impact was particularly severe during months of low discharge (October–December). Water transparency, dissolved oxygen and pH were lower (P < 0.001) at impacted downstream sites compared to upstream sites. Nineteen species (41.3% of all species we recorded) are threatened in Bangladesh and the abundance of these species, except one, decreased significantly (P < 0.05) at the impacted sites. We recommend improved wastewater management by applying primary treatment facilities and incorporating reedbed filtration as a mean of biological treatment, into the canals carrying wastewaters. The success of such measures should be tested with fish species that were most responsive to wastewater, using the indicator species concept.

A conceptual model for decentralized municipal wastewater management

2018 ◽  
Vol 13 (1) ◽  
pp. 134-142 ◽  
Author(s):  
Diana Bernal
Keyword(s):  
Conceptual Model ◽  
Urban Areas ◽  
Municipal Wastewater ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Wastewater Management ◽  
Benefit Analysis ◽  
Consultation Process ◽  
Treatment Facilities ◽  
Hierarchy Process

Abstract This paper proposes a conceptual model for selecting the centralization level for wastewater management in urban areas, which is associated with main sewage collectors and wastewater treatment facilities. The model is supported in the Analytical Hierarchy Process (AHP) and Cost-Benefit Analysis. Additionally, the model is based on the results of variables and indicators identified previously through an expert consultation process and prioritized by Ranking and Rating Multi-criteria Analysis. Three municipalities of Colombia were used as case studies for model validation purposes. As a result, decentralized plans can be a viable option when their associated benefits are quantified.

scholarly journals How Surface Water Management Can Benefit Fish Conservation in Urban Streams

2021 ◽  
Vol 12 (2) ◽  
pp. 383-394
Author(s):  
W. Aaron Wilson ◽  
Maria Wipfler ◽  
Josh Stevens
Keyword(s):  
Water Management ◽  
Species Richness ◽  
Fish Community ◽  
Municipal Wastewater ◽  
Urban Stream ◽  
Wastewater Management ◽  
Impervious Cover ◽  
Management Interventions ◽  
Community Metrics ◽  
Fish Community Metrics

Abstract We analyzed 33 y of fish community data collected from a low-order, urban stream in central Illinois, USA, to determine the effects of municipal wastewater management projects and urbanization on fish communities. From 1985 to 2017, species richness, number of pollution-intolerant species, and alternative index of biotic integrity significantly increased at sites across this system. Species diversity likewise increased, but was mostly significant only at sites downstream of the effluent outflow. Ceasing the chlorination of wastewater in 1990 resulted in significant increases in fish community metrics both upstream and downstream of effluent outflow, although effects varied from site to site. Completing a combined sewer overflow abatement project in 2008 resulted in some significant increases in species richness, diversity, and number of pollution-intolerant species at sites downstream of effluent outflow. From 2001 to 2016, the change in the number of pollution-intolerant species correlated inversely with the increased percentage of impervious cover in the study system. There was no significant correlation of other metrics with the change in percent impervious surfaces. These results suggest that urbanization at upstream sites limited to some extent the benefits of water management interventions that improved fish community metrics at downstream sites.

Wastewater release and its impacts on Canadian waters

2011 ◽  
Vol 68 (10) ◽  
pp. 1836-1859 ◽  
Author(s):  
Claire Holeton ◽  
Patricia A. Chambers ◽  
Laura Grace
Keyword(s):  
Wastewater Treatment ◽  
Human Health ◽  
Domestic Wastewater ◽  
Aquatic Organisms ◽  
Control Measures ◽  
Source Control ◽  
Wastewater Discharge ◽  
Untreated Wastewater ◽  
Treatment Facilities

Discharge of sewage to the environment in the form of treated or untreated wastewater can have serious impacts on human health and quality of life and on ecosystem condition. Since a previous review in 1997, upgrades to wastewater treatment facilities, along with improved source control, have produced successes in reducing loadings of certain pollutants (e.g., mercury, polychlorinated biphenyls) to Canadian waters. However, nationally, loads of phosphorus discharged from wastewater treatment facilities have not changed in recent years (2003–2008), and releases of nitrogen have increased slightly. In some locations, wastewater discharges are contributors to bacterial contamination, toxicity from heavy metals and ammonia, and eutrophication, all of which continue to threaten public and environmental health. An increasing number of studies are also demonstrating developmental, reproductive, and behavioural changes in fish and other aquatic organisms from exposure to pharmaceuticals, personal-care products, or other pollutants in domestic wastewater, even after treatment. Minimizing wastewater discharge and mitigating its effects on the environment and human health will be a challenge. It is critical that gains achieved by improved wastewater treatment and other control measures not be reversed by relaxation of efforts or by failure to keep pace with population growth.

scholarly journals APPLICATION OF TRADABLE DISCHARGE CREDITS TO WASTEWARTER MANAGEMENT: A FEASIBILITY STUDY

Ekonomika ◽  
2010 ◽  
Vol 89 (1) ◽  
pp. 80-90
Author(s):  
Linas Čekanavičius
Keyword(s):  
Field Study ◽  
Municipal Wastewater ◽  
Social Economic ◽  
Effective Means ◽  
Cost Effective ◽  
Economic Benefits ◽  
Wastewater Management ◽  
Wastewater Discharge ◽  
Discharge Management ◽  
The One

The paper presents results of a field study on the feasibility of applying tradable discharge credits approach to wastewater management. The hypothesis that formed the basis of the present study is that conversion of the existing municipal wastewater discharge management system in Lithuania into the one that uses tradable discharge credits can bring both private and overall (social) economic benefits in the form of increased flexibility of the sewerage subscribers to select the most cost-effective means of compliance with the discharge limits. Research has been conducted in order to determine whether the tradable discharge credits can be employed for municipal wastewater management and, if so, how it can be done. The presented framework of wastewater management, based on tradable discharge credits, can serve as a blueprint for similar applications in other countries or regions, as well as a basis for policy steps.

Monitoring and evaluation of removal of pathogens at municipal wastewater treatment plants

2010 ◽  
Vol 61 (6) ◽  
pp. 1589-1599 ◽  
Author(s):  
C. Y. Fu ◽  
X. Xie ◽  
J. J. Huang ◽  
T. Zhang ◽  
Q. Y. Wu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Primary Treatment ◽  
Fecal Coliforms ◽  
Municipal Wastewater Treatment ◽  
Tertiary Treatment ◽  
Somatic Coliphages ◽  
Untreated Wastewater ◽  
Municipal Wastewater Treatment Plants

The concentrations and removal of Cryptosporidium, Giardia, and microbial indicators, including somatic coliphages and fecal coliforms were investigated through the wastewater treatment processes at three municipal wastewater treatment plants in Beijing, China. The experimental results showed that the concentrations of Cryptosporidium in untreated wastewater, primary treatment effluent, secondary treatment effluent, tertiary treatment effluent were 33–600, 67–333, 0–9 and 0–0.4 oocysts L−1, and that of Giardia were 130–3,600, 533–2,033, 0–32 and 0–2.1 cysts L−1, respectively. The reduction ratios of Cryptosporidium and Giardia by the primary treatment process were 0.12 log and 0.18 log, respectively. Oxidation ditch process had higher reduction efficiency to Cryptosporidium and Giardia than anaerobic-anoxic-oxic process and conventional activated sludge process, probably because of longer retention time and higher sludge concentration. Membrane ultrafiltration had a notably better efficiency to reduce microorganisms, especially Cryptosporidium and Giardia, than conventional flocculation sedimentation and sand filtration process, as the tertiary treatment. Comparing with total coliforms, fecal coliforms and heterotrophic bacteria, concentration of somatic coliphages was correlated better with that of Cryptosporidium and Giardia in untreated wastewater and secondary treatment effluent.

Wastewater management in a dairy farm

1995 ◽  
Vol 32 (11) ◽  
pp. 1-11 ◽  
Author(s):  
Mohamed F. Hamoda ◽  
Saed M. Al-Awadi
Keyword(s):  
Wastewater Treatment ◽  
Waste Treatment ◽  
Dairy Farm ◽  
Primary Treatment ◽  
Treatment System ◽  
Wastewater Management ◽  
Batch Reactors ◽  
Wastewater Treatment System ◽  
Treated Effluent ◽  
Treatment Facilities

Field sampling and laboratory experimentation were conducted on wastewater effluent generated at a dairy farm in order to characterise the wastewater, evaluate existing primary treatment facilities, and examine an appropriate wastewater treatment system to produce good quality effluents. It has been found that the farm contributes effluents containing considerable loads of organics, solids and nutrient pollutants. Existing treatment facilities which are limited to batch-operated primary settling tanks, are not capable of producing good quality effluent. Experimentation on an aerobic, suspended growth, biological system using sequencing batch reactors (SBR) indicated that the pollutant loads in the primary-treated effluent could be substantially reduced. The study showed that a wastewater treatment system involving primary settling tanks combined with additional aerobic biological treatment is capable of removing about 94% COD and 96% SS from the farm effluents. This system could be easily integrated and coordinated with existing facilities. A wastewater management scheme has been proposed to include waste minimisation, waste treatment and effluent reuse in irrigation.

scholarly journals 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 ◽  
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.

scholarly journals On-Site Pilot Testing of Hospital Wastewater Ozonation to Reduce Pharmaceutical Residues and Antibiotic-Resistant Bacteria

Antibiotics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 684
Author(s):  
Sofia Svebrant ◽  
Robert Spörndly ◽  
Richard H. Lindberg ◽  
Therese Olsen Sköldstam ◽  
Jim Larsson ◽  
...  
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
High Flow ◽  
Resistant Bacteria ◽  
Municipal Wastewater Treatment ◽  
Antibiotic Resistant Bacteria ◽  
Antibiotic Resistant ◽  
Untreated Wastewater ◽  
Significant Difference ◽  
Hospital Sewage

Hospital sewage constitutes an important point source for antibiotics and antibiotic-resistant bacteria due to the high antibiotic use. Antibiotic resistance can develop and cause problems in sewage systems within hospitals and municipal wastewater treatment plants, thus, interventions to treat hospital sewage on-site are important. Ozonation has proven effective in treating relatively clean wastewater, but the effect on untreated wastewater is unclear. Therefore, we piloted implementation of ozonation to treat wastewater in a tertiary hospital in Uppsala, Sweden. We measured active pharmaceutical ingredients (APIs) using liquid chromatography-mass spectrometry and antibiotic-resistant Enterobacteriaceae using selective culturing pre- and post-ozonation. Comparing low (1 m3/h) and high (2 m3/h) flow, we obtained a ‘dose-dependent’ effect of API reduction (significant reduction of 12/29 APIs using low and 2/29 APIs using high flow, and a mean reduction of antibiotics of 41% using low vs. 6% using high flow, 25% vs. 6% for all APIs). There was no significant difference in the amount of antibiotic-resistant Enterobacteiaceae pre- and post-ozonation. Our results demonstrate that ozonation of untreated wastewater can reduce API content. However, due to the moderate API decrease and numerous practical challenges in the on-site setting, this specific ozonation system is not suitable to implement at full scale in our hospital.

Sign in / Sign up

Export Citation Format

Share Document