scholarly journals Nitrilotriacetic acid enhanced UV/Fe0/H2O2 process for salty wastewater treatment at neutral pH

Water Cycle ◽  
2021 ◽  
Author(s):  
Yuwei Pan ◽  
Zhujun Dong ◽  
Yi Pan ◽  
Yizhen Zhang
Keyword(s):  
Wastewater Treatment ◽  
Nitrilotriacetic Acid ◽  
Neutral Ph

scholarly journals Persulfate mediated solar photo-Fenton aiming at wastewater treatment plant effluent improvement at neutral PH: emerging contaminant removal, disinfection, and elimination of antibiotic-resistant bacteria

2021 ◽  
Author(s):  
Maria Clara V. M. Starling ◽  
Elizângela P. Costa ◽  
Felipe A. Souza ◽  
Elayne C. Machado ◽  
Juliana Calábria de Araujo ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Resistant Bacteria ◽  
Antibiotic Resistant Bacteria ◽  
Antibiotic Resistant ◽  
E Coli ◽  
Effluent Quality ◽  
Neutral Ph ◽  
Wastewater Treatment Plant Effluent

AbstractThis work investigated an innovative alternative to improve municipal wastewater treatment plant effluent (MWWTP effluent) quality aiming at the removal of contaminants of emerging concern (caffeine, carbendazim, and losartan potassium), and antibiotic-resistant bacteria (ARB), as well as disinfection (E. coli). Persulfate was used as an alternative oxidant in the solar photo-Fenton process (solar/Fe/S2O82−) due to its greater stability in the presence of matrix components. The efficiency of solar/Fe/S2O82− at neutral pH using intermittent iron additions is unprecedented in the literature. At first, solar/Fe/S2O82− was performed in a solar simulator (30 W m−2) leading to more than 60% removal of CECs, and the intermittent iron addition strategy was proved effective. Then, solar/Fe/S2O82− and solar/Fe/H2O2 were compared in semi-pilot scale in a raceway pond reactor (RPR) and a cost analysis was performed. Solar/Fe/S2O82− showed higher efficiencies of removal of target CECs (55%), E. coli (3 log units), and ARB (3 to 4 log units) within 1.9 kJ L−1 of accumulated irradiation compared to solar/Fe/H2O2 (CECs, 49%; E. coli, 2 log units; ARB, 1 to 3 log units in 2.5 kJ L−1). None of the treatments generated acute toxicity upon Allivibrio fischeri. Lower total cost was obtained using S2O82− (0.6 € m−3) compared to H2O2 (1.2 € m−3). Therefore, the iron intermittent addition aligned to the use of persulfate is suitable for MWWTP effluent quality improvement at neutral pH.

Inactivation of Enterococcus faecalis in simulated wastewater treatment plant effluent by solar photo-Fenton at initial neutral pH

2013 ◽  
Vol 209 ◽  
pp. 195-200 ◽  
Author(s):  
E. Ortega-Gómez ◽  
B. Esteban García ◽  
M.M. Ballesteros Martín ◽  
P. Fernández Ibáñez ◽  
J.A. Sánchez Pérez
Keyword(s):  
Wastewater Treatment ◽  
Enterococcus Faecalis ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Neutral Ph ◽  
Simulated Wastewater ◽  
Wastewater Treatment Plant Effluent

A highly efficient flow-through electro-Fenton system enhanced with nitrilotriacetic acid for phenol removal at neutral pH

2019 ◽  
Vol 697 ◽  
pp. 134173 ◽  
Author(s):  
Yinqiao Zhang ◽  
Qizhan Zhang ◽  
Sijin Zuo ◽  
Minghua Zhou ◽  
Yuwei Pan ◽  
...  
Keyword(s):  
Nitrilotriacetic Acid ◽  
Phenol Removal ◽  
Neutral Ph ◽  
Highly Efficient ◽  
Flow Through ◽  
Fenton System

Tripolyphosphate-assisted electro-Fenton process for coking wastewater treatment at neutral pH

2019 ◽  
Vol 26 (12) ◽  
pp. 11928-11939
Author(s):  
Fengxia Deng ◽  
Shan Qiu ◽  
Yingshi Zhu ◽  
Xiaoxiao Zhang ◽  
Jixian Yang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Coking Wastewater ◽  
Fenton Process ◽  
Neutral Ph

pH neutralization of textile industry wastewater for effective recycling

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Manickam Ramesh Kumar ◽  
Ramalingam Malathy ◽  
Sundararajan Paramasivam ◽  
Ill-Min Chung ◽  
Seung-Hyun Kim ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Textile Industry ◽  
Oxygen Demand ◽  
Wash Water ◽  
Polluted Water ◽  
Total Hardness ◽  
Content Type ◽  
Neutral Ph ◽  
Industrial Sectors ◽  
Industry Wastewater

Purpose The textile industry is one of the largest and most important industrial sectors in India. Because the textile industry consumes large quantities of water and produces highly polluted water discharge, its environmental impact is high. Water is expensive to use, treat and dispose of. Therefore, water conservation and reuse are critical necessity for the textile industry because decreasing water and wastewater treatment and recycling costs can be beneficial. Design/methodology/approach This research neutralized the pH during dyeing industry wastewater treatment. The system should be robust to erroneous sensor measurements. A pH meter was developed and used to monitor the pH of wastewater hourly before and after HCl treatment. Findings HCl was used to neutralize the pH of wastewater from 9 to 7.5. The amount of HCl was optimized depending on the wastewater. Three wastewater treatment methods were used, namely, HCl, wash water and reverse osmosis (RO) treatments. The HCl treatment was the most effective for decreasing the pH; the wash water treatment was the most effective for decreasing the total dissolved solids (TDS), total suspended solids (TSS) total hardness and chemical oxygen demand; and the RO treatment was the most effective for decreasing the biochemical oxygen demand, TDS, TSS, total hardness and Cl− concentration. Originality/value The pH should be monitored during the textile dyeing because the addition of color to textile fabrics is the most effective at neutral pH. This study evaluated several parameters of wastewater, including pH, color, TSS and TDS. The fabricated digital pH meter provided superior results than conventional measuring devices. The goal was to maintain a neutral pH during dyeing and recycle wastewater to improve environmental sustainability. The newly developed digital pH meter was less expensive and more precise than traditional pH meters. Before reusing and recycling, wastewater underwent ultrafiltration and RO treatment.

Examination of Rabbit Fc Crystals

1968 ◽  
Vol 26 ◽  
pp. 140-141
Author(s):  
J. P. Robinson ◽  
P. G. Lenhert
Keyword(s):  
Molecular Weight ◽  
Flat Plate ◽  
Phosphate Buffer ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Neutral Ph ◽  
Small Crystals ◽  
Carbon Coated ◽  
Diffraction Patterns

Crystallographic studies of rabbit Fc using X-ray diffraction patterns were recently reported. The unit cell constants were reported to be a = 69. 2 A°, b = 73. 1 A°, c = 60. 6 A°, B = 104° 30', space group P21, monoclinic, volume of asymmetric unit V = 148, 000 A°3. The molecular weight of the fragment was determined to be 55, 000 ± 2000 which is in agreement with earlier determinations by other methods.Fc crystals were formed in water or dilute phosphate buffer at neutral pH. The resulting crystal was a flat plate as previously described. Preparations of small crystals were negatively stained by mixing the suspension with equal volumes of 2% silicotungstate at neutral pH. A drop of the mixture was placed on a carbon coated grid and allowed to stand for a few minutes. The excess liquid was removed and the grid was immediately put in the microscope.

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