scholarly journals Methylated mud snail protein as a bio-flocculant for high turbidity wastewater treatment

2021 ◽  
Author(s):  
Shaohui Mao ◽  
Xiaohui Xu ◽  
Linjiang Zhang ◽  
Bo Bai ◽  
Na Hu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Particle Collision ◽  
Optimal Dosage ◽  
Potential Candidate ◽  
Mechanism Analysis ◽  
Railway Tunnel ◽  
Flocculation Efficiency ◽  
Mud Snail ◽  
High Turbidity ◽  
Snail Protein

Abstract The authors reported a potential candidate methylated mud snail protein (MeMsp) as an effective and eco-friendly flocculant to treat the high turbidity wastewater. MeMsp was obtained by extraction of mud snail protein (Msp) through isoelectric precipitation (PSC-IP) and then methylated via the esterification with side-chain carboxyl. Structural characterization of FT-IR, Zeta potential and elemental analysis were carried out and further confirmed the successful of the methylation Flocculation experiments with kaolin suspension simulated wastewater indicated that MeMsp-24 displayed more excellent flocculation efficiency at a low dosage. At the optimum dosage 27 mg/L, the maximum clarification efficiency of MeMsp-24 was 97.46% under pH 7.0. Furthermore, MeMsp-24 exhibited a wide flocculation window in the pH range of 1.0–9.0, and faster sedimentation velocity and larger flocs size. Meanwhile, MeMsp-24 exhibited 92.12% clarification efficiency in treating railway tunnel construction effluent. The flocculation kinetic and mechanism analysis revealed that the most effective particle collision occurred at the optimal dosage, with charge neutralization and adhesion played irreplaceable roles in different environment, respectively. Therefore, through the extraction and methylation modification, the MeMsp could be a promising eco-friendly flocculant for high turbidity wastewater treatment.

Study on Flocculation Characteristic of Silt in Yellow River

2012 ◽  
Vol 518-523 ◽  
pp. 2001-2005
Author(s):  
Sen Lin Zhu ◽  
Guo Lu Yang ◽  
Lin Shuang Liu
Keyword(s):  
Water Treatment ◽  
Settling Velocity ◽  
Yellow River ◽  
Test Methods ◽  
Optimal Dosage ◽  
Treatment Technology ◽  
River Chemistry ◽  
Flocculation Efficiency ◽  
High Turbidity ◽  
Water Treatment Technology

This paper maily studied the characteristics of silt flocculation of Yellow River. Chemistry and phiscal test methods were used to analyze the effects of silt concentration on settling velocity. The flocculation efficiency of PAM and PAC were compared in this work. Effects of silt concentration on needed PAM dosages and the optimal dosage of PAM at different silt concentration were discussed. Compound flocculants were also being studied. Research in this work has important practical value in the high turbidity water treatment technology for Yellow River and other rivers.

scholarly journals Removal of COD, NH4-N, and perfluorinated compounds from wastewater treatment plant effluent using ZnO-coated activated carbon

2020 ◽  
Author(s):  
Jiawei Tang ◽  
Yu Liu ◽  
Peidong Su ◽  
Jingwei Quan ◽  
Yufeng Hu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Carbon ◽  
Wastewater Treatment Plant ◽  
Contact Time ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Perfluorinated Compounds ◽  
Optimal Dosage ◽  
Membrane Diffusion ◽  
Removal Efficiencies

Abstract This study investigated the removal of chemical oxygen demand (COD), NH4-N, and perfluorinated compounds (PFCs) in the effluent from a wastewater treatment plant (WWTP) using ZnO coated activated carbon (ZnO/AC). Results suggested that the optimal dosage of the ZnO/AC was 0.8 g/L within 240 min of contact time, at which the maximum removal efficiency of COD was approximately 86.8%, while the removal efficiencies of PFOA and PFOS reached 86.5% and 82.1%. In comparison, the removal efficiencies of NH4-N, PFBA, and PFBS were lower, at approximately 47.9%, 44.0%, and 55.4%, respectively. In addition, COD was preferentially adsorbed before PFCs and NH4-N, when the contact time ranged from 0 to 180 min, and the order of PFCs removal showed a positive correlation with C-F chain length. The kinetic study revealed that the removal of COD, NH4-N, and PFCs could be better depicted and predicted by the Lagergren quasi-second order dynamic model with high correlation coefficients, which involved liquid membrane diffusion, intraparticle diffusion, and photocatalytic reactions. The saturated ZnO/AC was finally regenerated using ultrasound for 3 h and retained excellent performance, which proved it could be considered as an effective and alternative technology.

Photocatalytic properties of Cu2(Fe,Mn)SnS4 microspheres synthesized via hydrothermal method

2020 ◽  
Author(s):  
Edyta Waluś ◽  
Maciej Manecki
Keyword(s):  
Wastewater Treatment ◽  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Uv Light ◽  
Structural Features ◽  
Sulfide Mineral ◽  
Organic Dye ◽  
Photocatalytic Properties ◽  
Light Illumination ◽  
Potential Candidate

<p>The most industrial activities, that require organic dye materials for their applications, release a remarkable fraction of effluent water. As a result, serious environmental problems emerge due to the toxicity of many compounds which these industrial processes produce. The development of inexpensive and green methods for degradation of such organic dye laden water constitutes a landmark for the mitigation or even the elimination of the industrial sewage. Among many strategies, photocatalysis is regarded as the most viable one due to its usage of sunlight to decomposing organic pollutants.</p><p>The unlimited applications of nanocrystalline semiconductor materials in all sorts of technological fields, whether photochemical, biological, photovoltaic or photocatalysis have pushed to develop a new assortment of materials featuring novel properties for advanced applications. Semiconductor properties of stannite Cu<sub>2</sub>FeSnS<sub>4</sub> make it a potential candidate for application in photocatalytic industry. In nature, it is a common sulfide mineral which is formed as a result of hydrothermal processes. Its crystal structure allows for numerous substitutions including replacement of Fe by Mn.</p><p>In this report, the photocatalytic activity of  Cu<sub>2</sub>FeSnS<sub>4</sub> (CFTS) and Cu<sub>2</sub>MnSnS<sub>4</sub> (CMTS) synthetic microspheres for degradation of environment polluting dye such as methylene blue (MB) has been explored under UV light illumination. The unique morphology of the as-synthesized nanomaterial is expected to play a major role in tailoring the optical and electrical properties for the possible photo-voltaic application. The photocatalytic activity shows the potential use of this material as an efficient photocatalyst for wastewater treatment.</p><p>Modified stannite was synthesized by hydrothermal method using reactions of metal salts and sulfur in hot ethylene glycol at presence PVP solution in an autoclave at 195<sup>o</sup>C. The crystallinity, structural features, morphology and chemical composition were investigated using XRD, Raman, FTIR, and SEM - EDS. Synthetic Cu<sub>2</sub>(Fe,Mn)SnS<sub>4</sub> solid solutions are composed of spheres 1 – 1.5 µm in size, with rough surface and concentric internal structure. The structure matches hexagonal stannite. The promising optoelectrical and photocatalytic properties of CFTS and CMTS microspheres make them a potential candidate for photovoltaics as well as for effective wastewater treatment, providing further study has to be carried out to improve specific properties.</p><p>Financial support for the research was provided by Polish Ministry of Higher Education grant No. DI2016 004946 under "Diamond Grant" program.</p>

Effects of metal ions on biomass and 5-aminolevulinic acid production in Rhodopseudomonas palustris wastewater treatment

2015 ◽  
Vol 73 (2) ◽  
pp. 382-388 ◽  
Author(s):  
Shuli Liu ◽  
Guangming Zhang ◽  
Jianzheng Li ◽  
Xiangkun Li ◽  
Jie Zhang
Keyword(s):  
Wastewater Treatment ◽  
Metal Ions ◽  
Aminolevulinic Acid ◽  
Rhodopseudomonas Palustris ◽  
Oxygen Demand ◽  
Mechanism Analysis ◽  
Production Mechanism ◽  
Treatment Results ◽  
Ala Synthetase ◽  
Ala Dehydratase

This work investigated the effects of eight metal ions on Rhodopseudomonas palustris growth and 5-aminolevulinic acid (ALA) yield in wastewater treatment. Results show that metal ions (Mg2+ of 15 mmol/L, Fe2+ of 400 μmol/L, Co2+ of 4 μmol/L, Ni2+ of 8 μmol/L and Zn2+ of 4 μmol/L) could effectively improve the chemical oxygen demand (COD) removal, Rp. palustris biomass and ALA yield. The highest ALA yield of 13.1 mg/g-biomass was achieved with Fe2+ of 400 μmol/L. ALA yields were differentially increased under different metal ions in the following order: Fe2+ group > Mg2+ group > Co2+ group = Ni2+ group > Zn2+ group = Mo2+ group > control. Cu2+ and Mn2+ inhibited Rp. palustris growth and ALA production. Mechanism analysis revealed that metal ions changed ALA yields by influencing the activities of ALA synthetase and ALA dehydratase.

Preparation and Application of CA/BaSO4 -CR Composite Gel Ball in Cationic Dye Wastewater Treatment

2014 ◽  
Vol 955-959 ◽  
pp. 38-46
Author(s):  
Da Mei Yu ◽  
Yun Lin ◽  
Yi Min Zhang ◽  
Wen Juan Zhou ◽  
Dan Hua Zhao ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Calcium Alginate ◽  
Cationic Dyes ◽  
Potential Candidate ◽  
Cationic Dye ◽  
Dye Wastewater ◽  
Adsorption Selectivity ◽  
Adsorption Performance ◽  
Treatment Processes ◽  
Composite Gel

A new hybrid adsorbent of calcium-alginate encapsulated BaSO4-CR (CABSC) has been prepared. The adsorption selectivity and mechanism were studied by investigating the adsorption performance of two anionic and two cationic dyes. The adsorption of two cationic dyes (EV and MB) from aqueous solutions was examined using a batch sorption technique. The effects of time, pH, temperature and ionic strength on the adsorption were examined. Besides, this material was applied in the treatment of two practical cationic dye wastewaters. Our study shows that the sorbent could be a potential candidate for utilization in dye wastewater treatment processes.

Magnesium ions improving the growth and organics reduction of Rhodospirillum rubrum cultivated in sewage through regulating energy metabolism pathways

2015 ◽  
Vol 72 (3) ◽  
pp. 472-477
Author(s):  
Chang-Ru Xu ◽  
Pan Wu ◽  
Lang Lang ◽  
Ri-Jia Liu ◽  
Jian-Zheng Li ◽  
...  
Keyword(s):  
Biomass Production ◽  
Isocitrate Dehydrogenase ◽  
Rhodospirillum Rubrum ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Control Group ◽  
Optimal Dosage ◽  
Mechanism Analysis ◽  
Atp Production ◽  
Sewage Purification

Rhodospirillum rubrum has the potential for biomass resource recycling combined with sewage purification. However, low biomass production and yield restricts the potential for sewage purification. This research investigated the improvement of biomass production, yield and organics reduction by Mg2+ in R. rubrum wastewater treatment. Results showed that with optimal dosage (120 mg/L), biomass production reached 4,000 mg/L, which was 1.5 times of that of the control group. Biomass yield was improved by 43.3%. Chemical oxygen demand (COD) removal reached over 90%. Hydraulic retention time was shortened by 25%. Mechanism analysis indicated that Mg2+ enhanced the isocitrate dehydrogenase and Ca2+/Mg2+-ATPase activities, bacteriochlorophyll content on respiration and photophosphorylation. These effects then enhanced ATP production, which led to more biomass accumulation and COD removal. With 120 mg/L Mg2+ dosage, the isocitrate dehydrogenase and Ca2+/Mg2+-ATPase activities, bacteriochlorophyll content, ATP production were improved, respectively, by 33.3%, 50%, 67%, 41.3% compared to those of the control group.

scholarly journals ASSESSMENT OF THE PERFORMANCE WASTEWATER TREATMENT PLANT JSC ANGARSK PETROCHEMICAL COMPANY

2020 ◽  
Vol 2018 (1) ◽  
pp. 29-30
Author(s):  
Irina Muzovatkina ◽  
Dmitriy Dubrovskiy ◽  
Elena Simonova
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Optimal Dosage ◽  
Petrochemical Company ◽  
Selection Of

An assessment of the effectiveness of active coagulants and the selection of the optimal dosage of coagulants is presented.

scholarly journals The Effectiveness of Adsorbent Derived from Moringa Oleifera as A Water Treatment Agent

2019 ◽  
Vol 1 (4) ◽  
pp. 51-60
Author(s):  
Farasyahida A. Samad ◽  
Wan Salida Wan Mansor ◽  
Hidayatul Aini Zakaria
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Moringa Oleifera ◽  
Hydroxyl Group ◽  
X Ray Diffraction ◽  
Turbidity Removal ◽  
Turbidity Test ◽  
Treatment Agent ◽  
High Turbidity

Clean, safe and readily available water is very crucial in everyday life, especially for health, hygiene, and the productivity of the community. Unfortunately, increase in contaminants in water supplies from human activities and industrialization is very worrying. Conventional wastewater treatment includes the usage of alum that will affect health with prolonged consumption. This research was carried out to focus on the development of wastewater treatment system using adsorbent from Moringa oleifera seeds. Adsorbent was successfully synthesized from the seeds of Moringa oleifera. Characterization of the sample was made using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM), while the effectiveness of water treatment was analyzed using Turbidity Meter. Then, all samples were tested against kaolin wastewater. XRD results showed that all the adsorbent samples were amorphous in nature. FTIR results indicated that there were hydroxyl group and carboxylic group in the sample representing numerous oxygen-riddled functional groups on the surface. From SEM results, it was clearly shown that the pore structure and size of Moringa oleifera affected the capability of adsorption where the smaller the size, the more effective the sample. Turbidity test showed that the sample that worked best for wastewater treatment was adsorbent from Moringa oleifera seeds in size of 125µm that was heated for 4 hours with 93.76% turbidity removal. Therefore, this study proved that the adsorbent from Moringa oleifera seeds is very suitable for high turbidity wastewater treatment. Further studies investigating the combination of conventional activated carbon with adsorbent from Moringa oleifera seeds should be conducted before these samples are made available for further use so that we can compare which sample works best for wastewater treatment.

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