scholarly journals Bio-waste valorisation: agricultural wastes as biosorbents for removal of (in)organic pollutants in wastewater treatment

2021 ◽  
pp. 100239
Author(s):  
Nataša Karić ◽  
Alexandra S. Maia ◽  
Ana Teodorović ◽  
Nataša Atanasova ◽  
Guenter Langergraber ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Organic Pollutants ◽  
Agricultural Wastes ◽  
Waste Valorisation

In-situ chemical oxidation: peroxide or persulfate coupled with membrane technology for wastewater treatment

2021 ◽  
Author(s):  
Huchuan Yan ◽  
Cui Lai ◽  
Dongbo Wang ◽  
Shiyu Liu ◽  
Xiaopei Li ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Organic Pollutants ◽  
Health And Safety ◽  
Chemical Oxidation ◽  
Membrane Technology ◽  
In Situ Chemical Oxidation ◽  
Refractory Organic Pollutants

Refractory organic pollutants in wastewater have the characteristics of persistence and toxicity, which seriously threaten the health and safety of humans and other organisms. Many researchers have committed to developing...

Coagulation of organic pollutants by Moringa oleifera protein molecules: In silico approach

2021 ◽  
Author(s):  
Victoria Teniola Adeleke ◽  
Adebayo A Adeniyi ◽  
David Lokhat
Keyword(s):  
Wastewater Treatment ◽  
Organic Pollutants ◽  
In Silico ◽  
Moringa Oleifera ◽  
Seed Protein ◽  
Clean Water ◽  
Protein Extract ◽  
Natural Coagulant ◽  
Global Challenge ◽  
Protein Molecules

Availability of clean water for various activities is a global challenge. Moringa oleifera (MO) seed protein extract has been identified as a natural coagulant for wastewater treatment. The mechanistic understanding...

scholarly journals Enhanced Wastewater Treatment by Immobilized Enzymes

2021 ◽  
Author(s):  
Jakub Zdarta ◽  
Katarzyna Jankowska ◽  
Karolina Bachosz ◽  
Oliwia Degórska ◽  
Karolina Kaźmierczak ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Process Optimization ◽  
Organic Pollutants ◽  
Large Scale ◽  
Removal Rate ◽  
Immobilized Enzymes ◽  
Future Research ◽  
Process Conditions ◽  
Removal Rates ◽  
Catalytic Cycles

Abstract Purpose of Review In the presented review, we have summarized recent achievements on the use of immobilized oxidoreductases for biodegradation of hazardous organic pollutants including mainly dyes, pharmaceuticals, phenols, and bisphenols. In order to facilitate process optimization and achievement of high removal rates, effect of various process conditions on biodegradation has been highlighted and discussed. Recent Findings Current reports clearly show that immobilized oxidoreductases are capable of efficient conversion of organic pollutants, usually reaching over 90% of removal rate. Further, immobilized enzymes showed great recyclability potential, allowing their reuse in numerous of catalytic cycles. Summary Collected data clearly indicates immobilized oxidoreductases as an efficient biocatalytic tools for removal of hazardous phenolic compounds, making them a promising option for future water purification. Data shows, however, that both immobilization and biodegradation conditions affect conversion efficiency; therefore, process optimization is required to achieve high removal rates. Nevertheless, we have demonstrated future trends and highlighted several issues that have to be solved in the near-future research, to facilitate large-scale application of the immobilized oxidoreductases in wastewater treatment.

scholarly journals The Effectiveness of Organic Pollutants Removal in Constructed Wetland with Horizontal Sub-Surface Flow / Efektywność Usuwania Zanieczyszczeń Organicznych W Oczyszczalni Hydrofitowej

2015 ◽  
Vol 16 (1) ◽  
pp. 69-82 ◽  
Author(s):  
Anita Jakubaszek ◽  
Zofia Sadecka
Keyword(s):  
Wastewater Treatment ◽  
Organic Pollutants ◽  
Constructed Wetland ◽  
Suspended Solids ◽  
Research Work ◽  
Vegetation Period ◽  
Surface Flow ◽  
Seasonal Temperature ◽  
Work Related ◽  
Pollutants Removal

Abstract This paper presents the results of the research work related to the removal efficiency from wastewater organic pollutants and suspended solids at HSSF (horizontal subsurface flow) constructed wetland. The average effectiveness defined as loss of value COD in wastewater has reached 77%, for BOD5 - 80% and TOC - 82%. The effect of seasonal temperature changes and the period of plant vegetation and rest on the effectiveness of wastewater treatment were also analyzed. The results of the presented research showed a decrease in the efficiency of removing organic pollutants from wastewater and suspended solids in the autumn and winter. During the vegetation the object in Małyszyn has been characterized by the effectiveness of wastewater treatment at the level of 78% for COD, 82% for BOD5, and in the non-vegetation period the effectiveness has decreased up to 75% for COD and 74% for BOD5. During the plants growth the total suspension was removed in 88%, whereas during the plants rest efficiency of removing lowered to 69%.

scholarly journals Combined Application of UV Photolysis and Ozonation with Biological Aerating Filter in Tertiary Wastewater Treatment

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Zhaoqian Jing ◽  
Shiwei Cao
Keyword(s):  
Molecular Weight ◽  
Wastewater Treatment ◽  
Organic Pollutants ◽  
Wastewater Treatment Plants ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Secondary Effluent ◽  
Uv Photolysis ◽  
Combined Application

To enhance the biodegradability of residual organic pollutants in secondary effluent of wastewater treatment plants, UV photolysis and ozonation were used in combination as pretreatment before a biological aerating filter (BAF). The results indicated that UV photolysis could not remove much COD (chemical oxygen demand), and the performance of ozonation was better than the former. With UV photolysis combined with ozonation (UV/O3), COD removal was much higher than the sum of that with UV photolysis and ozonation alone, which indicated that UV photolysis could efficiently promote COD removal during ozonation. This pretreatment also improved molecular weight distribution (MWD) and biodegradability greatly. Proportion of organic compounds with molecular weight (MW) <3 kDalton was increased from 51.9% to 85.9%. COD removal rates with BAF and O3/BAF were only about 25% and 38%, respectively. When UV/O3oxidation was combined with BAF, the average COD removal rate reached above 61%, which was about 2.5 times of that with BAF alone. With influent COD ranging from 65 to 84 mg/L, the effluent COD was stably in the scope of 23–31 mg/L. The combination of UV/O3oxidation with BAF was quite efficient in organic pollutants removal for tertiary wastewater treatment.

scholarly journals Spatial Changes in Microbial Communities along Different Functional Zones of a Free-Water Surface Wetland

2020 ◽  
Vol 8 (10) ◽  
pp. 1604
Author(s):  
Mikhail V. Semenov ◽  
George S. Krasnov ◽  
Ksenia Y. Rybka ◽  
Sergey L. Kharitonov ◽  
Yulia A. Zavgorodnyaya ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetlands ◽  
Organic Pollutants ◽  
Water Surface ◽  
Particle Diameter ◽  
Free Water ◽  
Free Water Surface ◽  
Spatial Changes ◽  
Functional Zones ◽  
Surface Wetland

Constructed wetlands (CWs) are complicated ecosystems that include vegetation, sediments, and the associated microbiome mediating numerous processes in wastewater treatment. CWs have various functional zones where contrasting biochemical processes occur. Since these zones are characterized by different particle-size composition, physicochemical conditions, and vegetation, one can expect the presence of distinct microbiomes across different CW zones. Here, we investigated spatial changes in microbiomes along different functional zones of a free-water surface wetland located in Moscow, Russia. The microbiome structure was analyzed using Illumina MiSeq amplicon sequencing. We also determined particle diameter and surface area of sediments, as well as chemical composition of organic pollutants in different CW zones. Specific organic particle aggregates similar to activated sludge flocs were identified in the sediments. The highest accumulation of hydrocarbons was found in the zones with predominant sedimentation of fine fractions. Phytofilters had the highest rate of organic pollutants decomposition and predominance of Smithella, Ignavibacterium, and Methanothrix. The sedimentation tank had lower microbial diversity, and higher relative abundances of Parcubacteria, Proteiniclasticum, and Macellibacteroides, as well as higher predicted abundances of genes related to methanogenesis and methanotrophy. Thus, spatial changes in microbiomes of constructed wetlands can be associated with different types of wastewater treatment processes.

scholarly journals Evaluation of Photocatalysis Effect of Stainless Steel Mesh Coated with Nitrides, Oxynitrides and Transition Metals Cr and Ti on the Degradation of Orange II Dye

Proceedings ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 14 ◽  
Author(s):  
Mouele ◽  
Dinu ◽  
Parau ◽  
Missengue ◽  
Vladescu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Drinking Water ◽  
Wastewater Treatment ◽  
Transition Metals ◽  
Organic Pollutants ◽  
Orange Ii ◽  
Stainless Steel Mesh ◽  
Steel Mesh ◽  
Treatment Processes ◽  
Water And Wastewater

The increased detection of organic pollutants in drinking water and their resistance to degradation by wastewater treatment processes has motivated the development of more efficient, affordable and sustainable methods of purification of drinking water and wastewater. [...]

An overview on nanostructured TiO2–containing fibers for photocatalytic degradation of organic pollutants in wastewater treatment

2020 ◽  
pp. 101827
Author(s):  
Sarah Mozzaquatro Pasini ◽  
Alexsandra Valério ◽  
Guilin Yin ◽  
Jingfeng Wang ◽  
Selene M.A. Guelli Ulson de Souza ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Nanostructured Tio2

scholarly journals Application of Phycoremediation Using Microalgae Scenedesmus sp. as Wastewater Treatment in Removal of Heavy Metals from Food Stall Wastewater

2015 ◽  
Vol 773-774 ◽  
pp. 1168-1172 ◽  
Author(s):  
Nur Atikah Ahmad Latiffi ◽  
Radin Maya Saphira Radin Mohamed ◽  
Najeeha Mohd Apandi ◽  
Amir Hashim Mohd Kassim
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Organic Pollutants ◽  
Batch Reactor ◽  
Sampling Time ◽  
Peak Time ◽  
Optimum Time ◽  
Pollutant Load ◽  
Removal Of Heavy Metals ◽  
Concentration Cells

This paper represents the results of using phycoremediation technology in treating the wastewater produced from food stall activity by using microalgae of Scenedesmus sp. in removal of heavy metals. Phycoremediation has advantages over physic-chemical approaches as it is can completely degrade organic pollutants without destroy the surrounding flora and fauna. Aim of this study is to determine the effectiveness of microalgae Scenedesmussp to assimilate the pollutant load based on the optimum time and concentration. Characteristics of food stall wastewater need to be identified and analyse before phycoremediation process taken place. The wastewater sampling was collected at food stall during peak time i.e. at 8 a.m. and 4 p.m. Microalgae Scenedesmus sp. to be injected to the batch reactor based on five (5) different concentration cells. The results shows that the optimum removal of heavy metals are dominant by concentration no. 1 (C1) compare to other concentration in the treatment i.e. removal of Ferum by 88.22% and 69.63%, Copper by 60% and 53.85% at both sampling time while removal of zinc is dominant by concentration no.4 (C4) by 75.61% and 76.63% respectively.

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