scholarly journals High-efficiency and energy-saving alternating pulse current electrocoagulation to remove polyvinyl alcohol in wastewater

RSC Advances ◽  
2021 ◽  
Vol 11 (63) ◽  
pp. 40085-40099
Author(s):  
Jiepei Zhang ◽  
Junfeng Li ◽  
Chengxiao Ma ◽  
Lijuan Yi ◽  
Tiantian Gu ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Energy Saving ◽  
Removal Efficiency ◽  
High Efficiency ◽  
Pulse Current ◽  
Operating Costs ◽  
Electrode Stability ◽  
Electrode Passivation

Compared with DC-EC, the application of APC-EC can reduce electrode passivation and production of sludge and operating costs, and improve electrode stability and PVA removal efficiency.

Improvement of Ti/RuO2–IrO2 Anode Lifetime and Electrocatalytical Properties by Using an Eco-Friendly Thermal Decomposition Method Using Polyvinyl Alcohol as Solvent

2019 ◽  
Author(s):  
Charlys Bezerra ◽  
Géssica Santos ◽  
Marilia Pupo ◽  
Maria Gomes ◽  
Ronaldo Silva ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Polyvinyl Alcohol ◽  
High Efficiency ◽  
Electrochemical Impedance ◽  
Pechini Method ◽  
Low Cost ◽  
Charge Transfer Resistance ◽  
Transfer Resistance ◽  
Calcination Temperatures ◽  
Service Lifetime

<p>Electrochemical oxidation processes are promising solutions for wastewater treatment due to their high efficiency, easy control and versatility. Mixed metal oxides (MMO) anodes are particularly attractive due to their low cost and specific catalytic properties. Here, we propose an innovative thermal decomposition methodology using <a>polyvinyl alcohol (PVA)</a> as a solvent to prepare Ti/RuO<sub>2</sub>–IrO<sub>2</sub> anodes. Comparative anodes were prepared by conventional method employing a polymeric precursor solvent (Pechini method). The calcination temperatures studied were 300, 400 and 500 °C. The physical characterisation of all materials was performed by X-ray diffraction and scanning electron microscopy coupled with energy dispersive spectroscopy, while electrochemical characterisation was done by cyclic voltammetry, accelerated service lifetime and electrochemical impedance spectroscopy. Both RuO<sub>2</sub> and IrO<sub>2</sub> have rutile-type structures for all anodes. Rougher and more compact surfaces are formed for the anodes prepared using PVA. Amongst temperatures studied, 300 °C using PVA as solvent is the most suitable one to produce anodes with expressive increase in voltammetric charge (250%) and accelerated service lifetime (4.3 times longer) besides reducing charge-transfer resistance (8 times lower). Moreover, the electrocatalytic activity of the anodes synthesised with PVA toward the Reactive Blue 21 dye removal in chloride medium (100 % in 30 min) is higher than that prepared by Pechini method (60 min). Additionally, the removal total organic carbon point out improved mineralisation potential of PVA anodes. Finally, this study reports a novel methodology using PVA as solvent to synthesise Ti/RuO<sub>2</sub>–IrO<sub>2</sub> anodes with improved properties that can be further extended to synthesise other MMO compositions.</p>

Renewable Energy and Energy Saving: Worldwide Research Trends

2021 ◽  
Vol 13 (23) ◽  
pp. 13261
Author(s):  
Alberto-Jesus Perea-Moreno
Keyword(s):  
Renewable Energy ◽  
Environmental Impact ◽  
Energy Saving ◽  
High Efficiency ◽  
Research Trends ◽  
Important Resource ◽  
Industrial Sectors

Energy is a very important resource for the development of the residential and industrial sectors, and it should be used with high efficiency, low environmental impact, and at the lowest possible cost [...]

scholarly journals Evaluation of removal efficiency of residual diclofenac in aqueous solution by nanocomposite tungsten-carbon using design of experiment

2017 ◽  
Vol 76 (6) ◽  
pp. 1466-1473 ◽  
Author(s):  
M. H. Salmani ◽  
M. Mokhtari ◽  
Z. Raeisi ◽  
M. H. Ehrampoush ◽  
H. A. Sadeghian
Keyword(s):  
Aqueous Solution ◽  
Removal Efficiency ◽  
Design Of Experiment ◽  
High Efficiency ◽  
Carbon Powder ◽  
Batch Adsorption ◽  
Effective Parameters ◽  
Initial Concentration ◽  
Carbon Nanocomposite ◽  
Maximum Removal

Wastewater containing pharmaceutical residual components must be treated before being discharged to the environment. This study was conducted to investigate the efficiency of tungsten-carbon nanocomposite in diclofenac removal using design of experiment (DOE). The 27 batch adsorption experiments were done by choosing three effective parameters (pH, adsorbent dose, and initial concentration) at three levels. The nanocomposite was prepared by tungsten oxide and activated carbon powder in a ratio of 1 to 4 mass. The remaining concentration of diclofenac was measured by a spectrometer with adding reagents of 2, 2′-bipyridine, and ferric chloride. Analysis of variance (ANOVA) was applied to determine the main and interaction effects. The equilibrium time for removal process was determined as 30 min. It was observed that the pH had the lowest influence on the removal efficiency of diclofenac. Nanocomposite gave a high removal at low concentration of 5.0 mg/L. The maximum removal for an initial concentration of 5.0 mg/L was 88.0% at contact time of 30 min. The results of ANOVA showed that adsorbent mass was among the most effective variables. Using DOE as an efficient method revealed that tungsten-carbon nanocomposite has high efficiency in the removal of residual diclofenac from the aqueous solution.

Removal of phenol from steel wastewater by combined electrocoagulation with photo-Fenton

2018 ◽  
Vol 78 (6) ◽  
pp. 1260-1267 ◽  
Author(s):  
Mohammad Malakootian ◽  
Mohammad Reza Heidari
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Current Density ◽  
Steel Industry ◽  
High Efficiency ◽  
Oxygen Demand ◽  
Optimal Conditions ◽  
Suitable Alternative ◽  
Steel Mills ◽  
Real Wastewater

Abstract Phenol and its derivatives are available in various industries such as refineries, coking plants, steel mills, drugs, pesticides, paints, plastics, explosives and herbicides industries. This substance is carcinogenic and highly toxic to humans. The purpose of the study was to investigate the removal of phenol from wastewater of the steel industry using the electrocoagulation–photo-Fenton (EC-PF) process. Phenol and chemical oxygen demand (COD) removal efficiency were investigated using the parameters pH, Fe2+/H2O2, reaction time and current density. The highest removal efficiency rates of phenol and COD were 100 and 98%, respectively, for real wastewater under optimal conditions of pH = 4, current density = 1.5 mA/cm2, Fe2+/H2O2 = 1.5 and reaction time of 25 min. Combination of the two effective methods for the removal of phenol and COD, photocatalytic electrocoagulation photo-Fenton process is a suitable alternative for the removal of organic pollutants in industry wastewater because of the low consumption of chemicals, absence of sludge and other side products, and its high efficiency.

scholarly journals Investigating the species of microorganisms from activated sludge for handling phenol contaminated-air streams in biotrickling filter

2013 ◽  
Vol 16 (3) ◽  
pp. 96-105
Author(s):  
Anh Thi Kim Nguyen ◽  
Mi Thi Tra Le ◽  
Phu Ly Sy Nguyen ◽  
Nga Diep Yen Dang ◽  
Hien Thi To
Keyword(s):  
Bacillus Thuringiensis ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
High Efficiency ◽  
Bacillus Pumilus ◽  
Air Flow ◽  
Biotrickling Filter ◽  
Inlet Concentration ◽  
Air Streams ◽  
Removal Equipment

This research aimed at investigating the species of microorganisms from activated sludge is capable of handling gas-containing phenol vapor by means of trickling biofilter. By isolating and culturing microorganisms, two species, Bacillus pumilus and Bacillus thuringiensis, was discovered to dominate in phenol vapor removal equipment with high efficiency (about 90% with B. pumilus strain and 92% with B. thuringiensis strains) at inlet concentration about 650 - 850 mg/Nm3 and air flow of 1.5 L/min. Simultaneously, similar experiments were carried out with mixed microorganisms obtained removal efficiency of more than 80%. This result showed that microorganisms after being isolated gave higher performance than mixture of microorganisms. In particular, strain of B. thuringiensis could handle up to 3600 mg/Nm3 in inlet concentration at about 184.3 gphenolm-3.h-1 elimination capacity when removal efficiency was over 92%.

High Efficiency Single Wafer Cleaning for Wafer Bonding-Based 3D Integration Applications

2012 ◽  
Vol 187 ◽  
pp. 269-272 ◽  
Author(s):  
Don Dussault ◽  
F. Fournel ◽  
V. Dragoi
Keyword(s):  
Removal Efficiency ◽  
Wafer Bonding ◽  
High Efficiency ◽  
Current Work ◽  
Particle Removal ◽  
3D Integration ◽  
Production Scale ◽  
Megasonic Cleaning ◽  
Wafer Cleaning ◽  
Transducer Design

Current work describes development, testing and verification of a single wafer megasonic cleaning method utilizing a transducer design that meets the extreme particle neutrality, Particle Removal Efficiency (PRE), and repeatability requirements of production scale wafer bonding and other applications requiring extremely low particle levels.

An Economic Analysis on Regeneration Concrete Hollow Block

2012 ◽  
Vol 204-208 ◽  
pp. 3186-3189
Author(s):  
Song Gu ◽  
Chao Wang ◽  
Lu Li ◽  
Yu Ping Gan ◽  
Kai Lin
Keyword(s):  
Economic Analysis ◽  
Energy Saving ◽  
High Efficiency ◽  
Building Energy ◽  
Economic Benefits ◽  
Wall Material ◽  
Green Wall ◽  
Waste Concrete ◽  
Hollow Block ◽  
Building Energy Saving

With the development of wall innovation, the appearance of regeneration concrete hollow block has an important operation significance for building energy saving and high efficiency recycling of waste concrete. The paper introduces a new green wall material—regeneration concrete hollow block and analyzes the feasibility of its application from the point of macroscopic and technical economy. The paper forecasts the direct and indirect economic benefits after its application in order to promote the extension of regeneration concrete hollow block.

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