scholarly journals Removal efficiency of antibiotics from water through constructed wetlands, a review

2021 ◽  
Keyword(s):  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Low Cost ◽  
Treatment Plant ◽  
Developed Countries ◽  
Ecological Problem ◽  
Water Supplies ◽  
Design Data ◽  
Road Map ◽  
Hydraulic Load

<p>Contamination in water bodies with antibiotics and resistance genes is becoming an increasing threat to global health. Overuse of antibiotics has become a serious ecological problem worldwide. There is growing concern that antibiotics are losing their effectiveness due to increased antibiotic resistance in bacteria. During the last twenty years, the consumption of antibiotics has increased rapidly, which has been cited as one of the world’s worst abusers of antibiotics. Several studies have been conducted to solve this issue. Developed countries have introduced several methods but constructed wetlands have been found low cost technology. Although constructed wetlands (CWs) offer a potential way to remove these antibiotics from water supplies, knowledge of their mechanisms is limited. In this review, we highlight important aspects of antibiotic pollution in waters, the removal efficiency of constructed wetlands for antibiotic removal and that antibiotic pollution affects many things which taken together poses several challenges for environmental scientists. It has been discovered that four main factors are affecting the performance of constructed wetlands used for the treatment of antibiotics in water supplies, the types configurations of constructed wetlands, hydraulic load rates, substrates, plants, and microorganisms. Further researches focusing on these factors are recommended to improve the removal efficiency of antibiotics in constructed wetlands. Outcomes of the study could help wastewater treatment plant engineers with providing reliable design data and outline a road map for future researches.</p>

Treatment of the Domestic Sewage by the Lab-Scale Sub-Surface Horizontal-Flow Wetland

2011 ◽  
Vol 374-377 ◽  
pp. 1036-1039 ◽  
Author(s):  
Meng Lin ◽  
Yun Han
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Municipal Wastewater ◽  
Primary Standard ◽  
Treatment Plant ◽  
Shaanxi Province ◽  
Horizontal Flow ◽  
Municipal Wastewater Treatment ◽  
Isotherm Equation

Abstract：The constructed wetland is a new kind of wastewater treatment developing in recent years, which is very suitable for the regional characteristics of Shaanxi province. The design of the constructed wetlands is developed from the traditional sub-surface horizontal-flow wetlands (SSHFW). Two groups of wetlands were designed in parallel, and each single wetland can also became the vertical-flow wetland system. Aerating in front of the constructed wetlands is to study the removal efficiency of the organics. Test indicators contain SS、COD、Nitrogen、Phosphor and the rate of nitrification and de-nitrification. According to the experiments of the self-designed SSHFW, the removal efficiency of the SS, COD, NH4+-N、TN and TP were 92%, 82%, 40%, 46.2% and 70% respectively. The strength of nitrification and de-nitrification of the packing reached to 0.35mg/(kg.h) and 3.32mg/(kg.h). On the basis of the Langmuir adsorption isotherm equation, the adsorption quantity of coarse sand and gravel were 405.2mg/kg and 498.6mg/kg. The quality of the effluent met the primary standard of B-standard in the discharge standards of pollutants for municipal wastewater treatment plant (GB18918-2002).

scholarly journals Assessment of the performance of intermittent planted filters in treating urban wastewater under arid climate

2021 ◽  
Author(s):  
Hiba Tlili ◽  
Mahmoud Bali ◽  
Rachid Boukchina
Keyword(s):  
Removal Rate ◽  
Energy Requirement ◽  
Low Cost ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Ammonium Nitrogen ◽  
Quality Parameters ◽  
Urban Wastewater ◽  
Hydraulic Load

Abstract Intermittent planted filters are extensive biological purification techniques aimed at oxidizing and decontaminating urban wastewater at a low cost and with minimum environmental impacts. The main purpose of this study was to evaluate the performances of intermittent planted filters in treating urban wastewater under arid conditions of southern Tunisia. The experimental study was carried out on a pilot scale plant comprising five constructed gravel-sand basins. Screened urban wastewater effluent was intermittently applied with a daily hydraulic load of 400 L/m2. Several water quality parameters were monitored at the inlet and outlet of this treatment plant. The average removal rate were 94.8%, 92.3%, 99.3%, 89.9% and 93.3% for chemical and biological oxygen demand, total suspended solids, ammonium nitrogen and orthophosphate, respectively. Additionally, results demonstrated that this treatment system is capable to remove 3.67, 3.22 and 2.44 log units of total and faecal coliforms, and faecal streptococci, respectively. Results showed that Phragmites australis allowed the development of biofilm in the sand filter beds, improving their purification efficiency. Furthermore, no bio-sludge production, no mechanical aeration, low energy requirement (0.02 kW/m2) and green aesthetic ambience are the additional particular strengths of the proposed pilot-plant.

scholarly journals Diversity of antibiotics in hospital and municipal wastewaters and receiving water bodies and removal efficiency by treatment processes: a systematic review protocol

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Seyedeh Masoumeh Ebrahimi ◽  
Reza Dehghanzadeh Reyhani ◽  
Mohammad Asghari-JafarAbadi ◽  
Zahra Fathifar
Keyword(s):  
Systematic Review ◽  
Evidence Synthesis ◽  
Meta Analysis ◽  
Random Effect ◽  
Treatment Plant ◽  
Design Data ◽  
Road Map ◽  
Treatment Processes ◽  
Reliable Design ◽  
Receiving Water

Abstract Background Antibiotics are extensively discharged into the environment through sewages. These emergent contaminants cause health and environmental risks by toxicity, allergic impacts, non-biodegradability and more importantly advancing antibiotic resistance. Antibiotics are hardly removed by conventional treatment processes and frequently are being reported in aquatic environments. The systematic review outlined in this protocol will compile and synthesize literature on the variety and concentrations of antibiotics in wastewaters and receiving water resources. Also, the review will address the efficiency of treatment processes in elimination of antibiotics from aqueous solutions. Outcomes of the study could help wastewater treatment plant engineers with providing reliable design data and outline a road map for future researches. Methods The review will be performed according to the Collaboration for Environmental Evidence (CEE) guidelines for systematic review and evidence synthesis in environmental management, and will be reported according to ROSES reporting standards for systematic evidence syntheses. The published articles will be screened by considering the defined inclusion and exclusion criteria at the title, abstract and full-text levels. Included studies will be exposed to a critical appraisal for validity and quality assessment. The articles will be assessed on the susceptibility to bias and the studies with high bias will be excluded from the data synthesis. The data from included studies will be combined into a narrative synthesis. Random effect Meta-analysis will be conducted due to the likely range of underlying effects. If the heterogeneity exists, the source of heterogeneity will be sought by met-regression and subgroup analyses.

scholarly journals Aquatic Macrophytes in Constructed Wetlands: A Fight against Water Pollution

2020 ◽  
Vol 12 (21) ◽  
pp. 9202
Author(s):  
Leticia Y. Kochi ◽  
Patricia L. Freitas ◽  
Leila T. Maranho ◽  
Philippe Juneau ◽  
Marcelo P. Gomes
Keyword(s):  
Plant Species ◽  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Aquatic Macrophytes ◽  
Sewage Treatment ◽  
Pharmaceutical Products ◽  
Limiting Factors ◽  
Ecological Problem ◽  
Artificial Wetlands

There is growing concern among health institutions worldwide to supply clean water to their populations, especially to more vulnerable communities. Although sewage treatment systems can remove most contaminants, they are not efficient at removing certain substances that can be detected in significant quantities even after standard treatments. Considering the necessity of perfecting techniques that can remove waterborne contaminants, constructed wetland systems have emerged as an effective bioremediation solution for degrading and removing contaminants. In spite of their environmentally friendly appearance and efficiency in treating residual waters, one of the limiting factors to structure efficient artificial wetlands is the choice of plant species that can both tolerate and remove contaminants. For sometimes, the chosen plants composing a system were not shown to increase wetland performance and became a problem since the biomass produced must have appropriated destination. We provide here an overview of the use and role of aquatic macrophytes in constructed wetland systems. The ability of plants to remove metals, pharmaceutical products, pesticides, cyanotoxins and nanoparticles in constructed wetlands were compared with the removal efficiency of non-planted systems, aiming to evaluate the capacity of plants to increase the removal efficiency of the systems. Moreover, this review also focuses on the management and destination of the biomass produced through natural processes of water filtration. The use of macrophytes in constructed wetlands represents a promising technology, mainly due to their efficiency of removal and the cost advantages of their implantation. However, the choice of plant species composing constructed wetlands should not be only based on the plant removal capacity since the introduction of invasive species can become an ecological problem.

scholarly journals Potential of Typha latifolia L. for phytofiltration of iron-contaminated waters in laboratory-scale constructed microcosm conditions

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Maibam Dhanaraj Meitei ◽  
Majeti Narasimha Vara Prasad
Keyword(s):  
Wastewater Treatment ◽  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Iron Uptake ◽  
Preliminary Report ◽  
Low Cost ◽  
Typha Latifolia ◽  
Plant Tissues ◽  
Copper Supplementation ◽  
Contaminated Waters

AbstractThe present study gave a preliminary report on the phytofiltration of iron-contaminated waters and aggravation of iron uptake by copper supplementation using Typha latifolia L. in constructed microcosms. During the experiment, Fe concentrations reduced up to 1.67 ± 0.076 mg L−1 (94.43% removal efficiency) and 0.087 ± 0.013 mg L−1 (97.10% removal efficiency) by 14th day from the initial concentrations of 30 mg L−1 in the microcosm setups. Iron accumulation in the plant tissues was 2425.65 ± 41.01 mg kg−1 (Fe with Cu) compared with 1446.00 ± 36.01 mg kg−1 (without Cu), revealing that Cu addition in the microcosm setup magnifies Fe accumulation and removal. Thus, the results signify that constructed wetlands (CW) can serve as the low-cost, ecofriendly alternative for wastewater treatment.

Study on Biological Purification Effect on Tail Water from Sewage Treatment Plant at Small-Scaled Town, South Jiangsu

2014 ◽  
Vol 641-642 ◽  
pp. 384-389
Author(s):  
Rui Wu ◽  
Li Gang Xu ◽  
Dan Chen
Keyword(s):  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Theoretical Basis ◽  
Biological Treatment ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
First Grade ◽  
Treatment Technology ◽  
Tail Water

As a cost-effective technology, using biological treatment technology to treat tail water has been gradually promoted in and abroad. Biological treatment technology uses the organic combination of water ecosystem to remove the organic pollutants and pollutants such as N and P which cause water eutrophication. This paper takes Jiangyin City Xinqiao Town Sewage Treatment Plant as example to construct bio-ecological combined constructed wetlands system near natural river course to treat tail water from sewage treatment plant and investigates the removal efficiency of combination process for COD, ammonia, TN and TP in tail water. The research indicates that bio-ecological combined constructed wetlands system has good removal efficiency for pollutants in tail water. And the average removal rate of COD, ammonia, TN and TP are 29%, 31%, 18%, and 8%; the average effluent concentration of them are 35.54mg/L, 0.97mg/L, 10.77 mg/L, and 0.11 mg/L. The result exactly matches the first grade A standard of Urban Sewage Treatment Plant Pollutant Discharge Standard (GB18918-2002). It has great potential for tail water treatment and is suitable for rural regions. The research result provides both the data and theoretical basis for improvement of biological treatment technology of tail water from sewage treatment plant, and also provides direct theoretical basis and practical experience for promotion and research of wetlands ecosystem.

Lab and pilot scale tests as tools for upgrading - comparison with full scale results

1998 ◽  
Vol 37 (9) ◽  
pp. 25-31 ◽  
Author(s):  
Åsa Malmqvist ◽  
Lars Gunnarsson ◽  
Christer Torstenon
Keyword(s):  
Biological Treatment ◽  
Low Cost ◽  
Treatment Plant ◽  
Paper Mill ◽  
Pilot Scale ◽  
Full Scale ◽  
Organic Load ◽  
Small Scale ◽  
Design Data ◽  
Biofilm Process

Parameters such as hydraulic retention time, organic load, maximum COD removal, sludge characteristics and optimal nutrient dosage can be determined by simulation in small scale models of the chosen process. Laboratory tests are the natural first step when considering upgrading, or designing a new, biological treatment plant. The potential for a biological treatment can be examined at a low cost and within a minimum of time, often through parallel testing of different treatment methods. Once a suitable process configuration has been found, lab scale tests may well be used for optimizing the process and obtaining design data, thus minimizing the need for more expensive tests in larger scale. The principal reason for a pilot plant test is the possibility to investigate natural variations in wastewater composition and the effect this will have on process stability. The use of laboratory and pilot scale tests is here illustrated by the work carried out prior to the upgrading of the treatment plant at Nyboholm paper mill. A description of the upgraded full scale installation consisting of both chemical treatment and a suspended-carrier biofilm process is included and a comparison between results from lab, pilot and full scale treatment is made.

EMPOWERING WOMEN THROUGH ENTREPRENEURSHIP: ASPECTS AND APPROACHES

2014 ◽  
Vol 6 (01) ◽  
Author(s):  
JAVED ALAM SHEIKH
Keyword(s):  
Economic Development ◽  
Developed Countries ◽  
Substantial Contribution ◽  
Economic Empowerment ◽  
World Population ◽  
Least Developed Countries ◽  
The Road ◽  
Road Map ◽  
The World ◽  
The Status

Almost 50 per cent of the world population is constituted by the women and they have been making substantial contribution to socio-economic development. But, unfortunately their tremendous contribution remains unrecognized and unnoticed in most of the developing and least developed countries causing the problem of poverty among them. Empowering women has become the key element in the development of an economy. With women moving forward, the family moves, the village moves and the nation moves. Hence, improving the status of women by way of their economic empowerment is highly called for. Entrepreneurship is a key tool for the economic empowerment of women around the world for alleviating poverty. Entrepreneurship is now widely recognized as a tool of economic development in India also. In this paper I have tried to discuss the reasons and role of Women Entrepreneurship with the help of Push and Pull factors. In the last I have also discussed the problems and the road map of Women Entrepreneurs development in India.

Long-Term Simulation of Pollutant Loads in Treatment Plant Effluents and Combined Sewer Overflows

1990 ◽  
Vol 22 (10-11) ◽  
pp. 69-76 ◽  
Author(s):  
A. Durchschlag
Keyword(s):  
Waste Water Treatment ◽  
Treatment Plant ◽  
Storm Water ◽  
Water Runoff ◽  
Storage Tanks ◽  
Combined Sewer Overflows ◽  
Storm Water Runoff ◽  
Combined Sewer ◽  
Hydraulic Load ◽  
Water Tanks

As a result of urbanization, the pollutant discharges from sources such as treatment plant effluents and polluted stormwaters are responsible for an unacceptable water quality in the receiving waters.In particular, combined sewer system overflows may produce great damage due to a shock effect. To reduce these combined sewer overflow discharges, the most frequently used method is to build stormwater storage tanks. During storm water runoff, the hydraulic load of waste water treatment plants increases with additional retention storage. This might decrease the treatment efficiency and thereby decrease the benefit of stormwater storage tanks. The dynamic dependence between transport, storage and treatment is usually not taken into account. This dependence must be accounted for when planning treatment plants and calculating storage capacities in order to minimize the total pollution load to the receiving waters. A numerical model will be described that enables the BOD discharges to be continuously calculated. The pollutant transport process within the networks and the purification process within the treatment plants are simulated. The results of the simulation illustrate; a statistical balance of the efficiency of stormwater tanks with the treatment plant capacity and to optimize the volume of storm water tanks and the operation of combined sewer systems and treatment plants.

A Batch Activated Sludge Study of Pineapple Wastewater Using a Bioaugmentation Process

1991 ◽  
Vol 24 (5) ◽  
pp. 233-240 ◽  
Author(s):  
Nik Fuaad Nik Abllah ◽  
Aik Heng Lee
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Ammonia Nitrogen ◽  
Batch Reactors ◽  
Organic Loading ◽  
Suitable Alternative ◽  
Organic Removal ◽  
Sludge Production

A laboratory study was conducted to determine the feasibility of batch activated sludge reactor for treating pineapple wastewater and to examine the effects of bioaugmentation on treatment performance. The experimental set-up consists of eleven batch reactors. Activated sludge obtained from a wastewater treatment plant treating domestic wastewater was used as seed for the reactors. Synthetic pineapple wastewater was used as feed for the reactors. The eleven reactors were arranged to evaluate the total organic removal, nitrification, and sludge production by bioaugmentation process. Three major factors considered were influent organic loading, ammonia-nitrogen, and dosage of bacterial-culture-product addition. Removal of TOG (total organic carbon), sludge production in terms of SS(suspended solids), and ammonia-nitrogen removal variation are used as evaluation parameters. The TOC removal efficiency after the end of a 48 hour reactor run, for influent TOC of 350.14 to 363.30 mg/l, and 145.92 to 169.66 mg/l, was 94.41 to 95.89%, and 93.72 to 94.73% respectively. Higher organic removal was observed in the bioaugmented reactors with higher organic loading. The better organic removal efficiency in the bioaugmented reactors was probably due to activities of bacteria added. The test results also indicated that sludge yield was enhanced by the bacteria additive and high bacteria dosage produced less sludge. Bioaugmentation was observed to be a suitable alternative for enhancing the biological treatment of pineapple wastewater.

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