Polyelectrolytes as a Material of Value in Water Treatment: A Review

2021 ◽  
Vol 18 (3) ◽  
pp. 109-115
Author(s):  
Shagufta Jabin ◽  
Priti Gupta ◽  
Mukta Sharma
Keyword(s):  
Water Treatment ◽  
Industrial Wastewater ◽  
Aquatic Animals ◽  
Treated Water ◽  
Optimum Dosage ◽  
Water And Wastewater ◽  
Removal Of Contaminants ◽  
Different Origins

The use of polyelectrolytes in the treatment of water/wastewater has been studied with special emphasis on the characteristic impurities, which should be removed and the types of polyelectrolytes commonly available. Much attention is being on using polyelectrolyte as primary coagulation, their application as a coagulant aid, including the use of dual polyelectrolytes in the treatment of complex industrial wastewater. The optimum dosage of polyelectrolytes in all kinds of water and wastewater is very low when they are used as coagulant aids in conjunction with inorganic polyelectrolytes. Hence, the quantification of remaining polyelectrolytes in the water after their treatment is ruled out in this case. Polymer toxicity in aquatic animals has been assessed and the presence of residual polyelectrolytes in the treated water has been discussed. Keeping in view the applicability of these polyelectrolytes for the removal of contaminants, it is expected that this technique can be applied for further investigation in various types of water from different origins.

Natural coagulants for the treatment of water and wastewater: A futuristic option for sustainable water clarification.

2020 ◽  
Vol 13 ◽  
Author(s):  
Manoj Kumar Karnena ◽  
Saritha Vara
Keyword(s):  
Water Treatment ◽  
Real Time ◽  
Industrial Wastewater ◽  
Treatment Options ◽  
Advanced Treatment ◽  
Technical Aspects ◽  
Treatment Technologies ◽  
Natural Coagulants ◽  
Water And Wastewater ◽  
Real Time Applications

: Many studies reported the application of natural coagulants in removing pollutants with the help of the coagulation process, and coagulants showed their efficiency in comparison to the literature available. Yet, the utilization or acceptance of these coagulants in treating industrial wastewater is very low. Thus, there is a need for a strategy for enhancing the potential usage of coagulants for water treatment, presenting prevailing options and efforts for the development of coagulants. The utilization of coagulants can be improved by showing their efficiency in comparison to the advanced treatment technologies available in the present scenario. The coagulation efficiency with natural coagulants can be enhanced by mongrelizing the coagulants with other coagulants, enhancing the purity during extraction procedures, and by coalescence of coagulants. However, the research on natural coagulants are quite encouraging, perception of sustainable assessment studies revealed that commercialization/acceptance of coagulants for treatment options are hindered by their applicability and feasibility in real-time applications, and utilization of coagulants ignore the socioeconomic, ecological and technical aspects. The present review mainly focuses on the issues related to natural coagulants for clarifying the uncertainties and simultaneously moving the water industries to be more sustainable.

Novel Fe3O4/HNT@rGO composite via a facile co-precipitation method for the removal of contaminants from aqueous system

RSC Advances ◽  
2016 ◽  
Vol 6 (54) ◽  
pp. 49228-49235 ◽  
Author(s):  
Chengwei Gao ◽  
Baojun Li ◽  
Ning Chen ◽  
Jie Ding ◽  
Qiang Cai ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Water Treatment ◽  
Potential Application ◽  
High Performance ◽  
Aqueous System ◽  
Precipitation Method ◽  
Precipitation Process ◽  
System P ◽  
Removal Of Contaminants ◽  
Co Precipitation

Fe3O4/HNT@rGO composite (FHGC) was fabricated via a facile co-precipitation process, followed by heat treatment. For RhB and As5+removal, the high performance and easy separation of FHGC highlight its potential application in water treatment.

scholarly journals Cyanobacteria and microcystin contamination in untreated and treated drinking water in Ghana

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Gloria Naa Dzama Addico ◽  
Jörg D. Hardege ◽  
Jiri Kohoutek ◽  
Kweku Amoaku Atta DeGraft-Johnson ◽  
Pavel Babica
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Human Health ◽  
Metropolitan Area ◽  
Cyanobacterial Blooms ◽  
Maximal Concentration ◽  
Raw Water ◽  
Treated Water ◽  
Treated Drinking Water ◽  
Who Guideline

<p>Although cyanobacterial blooms and cyanotoxins represent a worldwide-occurring phenomenon, there are large differences among different countries in cyanotoxin-related human health risk assessment, management practices and policies. While national standards, guideline values and detailed regulatory frameworks for effective management of cyanotoxin risks have been implemented in many industrialized countries, the extent of cyanobacteria occurrence and cyanotoxin contamination in certain geographical regions is under-reported and not very well understood. Such regions include major parts of tropical West and Central Africa, a region constisting of more than 25 countries occupying an area of 12 million km<sup>2</sup>, with a total population of 500 milion people. Only few studies focusing on cyanotoxin occurrence in this region have been published so far, and reports dealing specifically with cyanotoxin contamination in drinking water are extremely scarce. In this study, we report seasonal data on cyanobacteria and microcystin (MC) contamination in drinking water reservoirs and adjacent treatment plants located in Ghana, West Africa. During January-June 2005, concentrations of MCs were monitored in four treatment plants supplying drinking water to major metropolitan areas in Ghana: the treatment plants Barekese and Owabi, which serve Kumasi Metropolitan Area, and the plants Kpong and Weija, providing water for Accra-Tema Metropolitan Area. HPLC analyses showed that 65% samples of raw water at the intake of the treatment plants contained intracellular MCs (maximal detected concentration was 8.73 µg L<sup>-1</sup>), whereas dissolved toxins were detected in 33% of the samples. Significant reduction of cyanobacterial cell counts and MC concentrations was achieved during the entire monitoring period by the applied conventional water treatment methods (alum flocculation, sedimentation, rapid sand filtration and chlorination), and MC concentration in the final treated water never exceeded 1 µg L<sup>-1</sup> (WHO guideline limit for MCs in drinking water). However, cyanobacterial cells (93-3,055 cell mL<sup>-1</sup>) were frequently found in the final treated water and intracellular MCs were detected in 17% of the samples (maximal concentration 0.61 µg L<sup>-1</sup>), while dissolved MCs were present in 14% of the final treated water samples (maximal concentration 0.81 µg L<sup>-1</sup>). It indicates a borderline efficiency of the water treatment, thus MC concentrations in drinking water might exceed the WHO guideline limit if the treatment efficiency gets compromised. In addition, MC concentrations found in the raw water intake might represent significant human health risks for people living in areas with only a limited access to the treated or underground drinking water.</p>

scholarly journals B-Cyclodextrin Polyurethanes Copolymerised with Beetroot Fibers (Bio-Polymer), for the Removal of Organic and Inorganic Contaminants from Water

2013 ◽  
Vol 2 (1) ◽  
pp. 150 ◽  
Author(s):  
Jamil Rima ◽  
Karine Assaker
Keyword(s):  
Heavy Metals ◽  
Methylene Blue ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Water Treatment ◽  
Aromatic Hydrocarbons ◽  
Rhodamine B ◽  
Industrial Wastewater ◽  
Contaminated Groundwater ◽  
Inorganic Contaminants ◽  
Polycyclic Aromatic

<p>In this study, B-Cyclodextrinn polymerized with beetroot fibers (Bio-polymer), was prepared and applied to the removal of organic and inorganic contaminants from wastewater. An investigation into the use of cross-linked cyclodextrin polyurethanes copolymerised with beetroot fibers as adsorbents for organic pollutants and heavy metals has yielded very useful results which may have an impact in future water treatment applications.</p> The Biopolymer was tested in water contaminated by dyes, polycyclic aromatic hydrocarbons (PAH) and heavy metals. The effectiveness to eliminate dyes such as methylene blue and Rhodamine B with concentrations around 100 ppm was more than 99%, while the pyrene,which was chosen as an example among PAHs, showed a potential of elimination exceeding the 97% for solutions of 10 ppm. Also, heavy metals, such as Lead, Zn, and Cu, were tested and showed an efficacy exceeding the 99.8%. The results indicated that the biopolymer developed in this study has the potential to be a promising material for the removal of mixed pollutants from industrial wastewater or from contaminated groundwater.

EOR Returned Polymer Removal from Produced Water by Chemical Coagulation – A Successful Pilot Testing

2021 ◽  
Author(s):  
Robert Zagitov ◽  
Jaisankar Subramanian ◽  
Srinivasa Rao Gopisetty ◽  
Avinash Kumar ◽  
Vinay Mathur ◽  
...  
Keyword(s):  
Water Treatment ◽  
Produced Water ◽  
Scaling Up ◽  
Bench Test ◽  
Treatment Technology ◽  
Chemical Coagulation ◽  
Full Field ◽  
Treated Water ◽  
North West ◽  
Solids Loading

Abstract Severe fouling of crude oil and produced water treatment equipment of Mangala Processing Terminal (MPT) with elastic deposits has been observed after EOR polymer breaking through to the producing wells. Fouling by polymer containing solids caused the system bottlenecking impacting on crude production rates and deterioration of water quality for injection due to increase of total solids loading. The objective of the study included developing the water treatment technology for removing the returned polymer, developing the pilot run for implementation of the technology and scaling up the process if the pilot shows success. Crude processed at MPT is produced from Mangala, Bhagyam and Aishwarya fields which are located at the north-west part of India. Full field polymer flooding has been implemented in the Mangala field from 2015. Fouling of downhole and topside equipment with elastic deposits has been reported soon after polymer breakthrough the same year. For reducing the fouling potential and solids loading, the concept of removing the returned polymer from produced water has been considered as beneficial. Removal of polymer through the chemical coagulation was considered for developing. Extensive laboratory and bench testing have been carried out. Based on the laboratory results, the pilot was developed and carried out on the flotation equipment available at MPT. In the laboratory and bench test for polymer coagulation, over 70% polymer removal was achieved with non-sticky flocks and minimal sludge. The tests also demonstrated reduced suspended solids, residual oil and filterability improvement of treated water. The pilot run confirmed effectiveness of the chemical coagulation process to remove polymer. Polymer removal &gt; 70% was observed during the pilot. Oil removal from produced water at 60-80% was seen. Cloud point of polymer remaining in water increased from 60°C to &gt; 110°C indicating on the significant potential reduction of remaining polymer to precipitate from treated water. The pilot results demonstrated on the applicability of the technology of chemical polymer removal at MPT and will be used for scaling up the treatment facilities.

Volatile Organic Compounds in Water at Thirty Canadian Potable Water Treatment Facilities

1982 ◽  
Vol 65 (6) ◽  
pp. 1370-1374
Author(s):  
Rein Otson ◽  
David T Williams ◽  
Peter D Bothwell
Keyword(s):  
Water Treatment ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Potable Water ◽  
Treated Water ◽  
Liquid Liquid Extraction ◽  
Volatile Organic ◽  
Treatment Facilities ◽  
Benzene Toluene ◽  
Potable Water Treatment

Abstract A static headspace technique and previously developed and evaluated dynamic headspace and liquid-liquid extraction techniques were applied in a survey of volatile organic compounds in water at 30 Canadian potable water treatment facilities. Of the 43 compounds investigated, 27 compounds were detected in the water samples. Chloroform and bromodichloromethane occurred most frequently in treated water, and trichloroethylene, tetrachloroethylene, 1,2-dichloroethane, dichloromethane, benzene, toluene, ethylbenzene, and the xylenes occurred frequently in both treated and raw water. Only chloroform occurred frequently at levels above 10 μg/L in treated water. Generally, higher levels of organic compounds were found during August-September than during November-December.

scholarly journals Bioenergy productivity of sugar beet irrigated with reclaimed wastewaters

2015 ◽  
Vol 10 (3) ◽  
pp. 155 ◽  
Author(s):  
Pasquale Campi ◽  
Alejandra Navarro ◽  
A. Domenico Palumbo ◽  
Marcello Mastrangelo ◽  
Antonio Lonigro ◽  
...  
Keyword(s):  
Water Treatment ◽  
Water Resources ◽  
Sugar Beet ◽  
Fresh Water ◽  
Natural Water ◽  
Treated Wastewater ◽  
Growing Seasons ◽  
Strategic Role ◽  
Water And Wastewater ◽  
Reclamation Process

The use of treated wastewater to irrigate the sugar beet (<em>Beta</em> <em>Vulgaris</em> L. var. saccharifera) for bioethanol could play a strategic role to contrast the use of natural water resources and increase the productivity of the crop. The 2-year experiment (2013-2014) was performed on sugar beet irrigated with fresh water and wastewater at different steps of the reclamation process (secondary and tertiary treatments). The data obtained showed that the root sugar beet yield and ethanol production under fresh water treatment (52.2 Mg ha<sup>–1</sup> and 5446 L ha<sup>–1</sup>) were lower respect to that obtained from the secondary and tertiary wastewater treatments (66.7 Mg ha<sup>–1</sup> and 6785 L ha<sup>–1</sup>, and 58.7 Mg h<sup>–1</sup> and 6164 L ha<sup>–1</sup>, respectively), with the same irrigation volumes. These results can depend on the higher quantity of nutrient uptake when wastewater is used for irrigation. In particular, the average N applied (as nitrate and ammonium) with irrigation during the growing seasons (2013 and 2014) was corresponding to the supply of 4, 28 and 20 kg ha<sup>–1</sup>, for the fresh water, secondary, and tertiary wastewater treatments, respectively.

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