scholarly journals Electrochemical Removal of Ammonium Nitrogen and COD of Domestic Wastewater using Platinum Coated Titanium as an Anode Electrode

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 883 ◽  
Author(s):  
Umesh Ghimire ◽  
Min Jang ◽  
Sokhee Jung ◽  
Daeryong Park ◽  
Se Park ◽  
...  
Keyword(s):  
Biological Treatment ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Electrochemical Treatment ◽  
Ammonium Nitrogen ◽  
Electrochemical Process ◽  
Electric Voltage ◽  
Anode Electrode ◽  
Titanium Material ◽  
Electrochemical Removal

Biological treatment systems face many challenges in winter to reduce the level of nitrogen due to low temperatures. The present work aimed to study an electrochemical treatment to investigate the effect of applying an electric voltage to wastewater to reduce the ammonium nitrogen and COD (chemical oxygen demand) in domestic wastewater. This was done by using an electrochemical process in which a platinum-coated titanium material was used as an anode and stainless steel was used as a cathode (25 cm2 electrode area/500 mL). Our results indicated that the removal of ammonium nitrogen (NH4+–N) and the lowering of COD was directly proportional to the amount of electric voltage applied between the electrodes. Our seven hour experiment showed that 97.6% of NH4+–N was removed at an electric voltage of 5 V, whereas only 68% was removed with 3 V, 20% with 1.2 V, and 10% with 0.6 V. Similarly, at 5 V, the removal of COD was around 97.5%. Over the seven hours of the experiment, the pH of wastewater increased from pH 7.12 to pH 8.15 when 5 V was applied to the wastewater. Therefore, electric voltage is effective in the oxidation of ammonium nitrogen and the reduction in COD in wastewater.

scholarly journals Application of electrochemical treatment for the removal of triazine dye using aluminium electrodes

2020 ◽  
Vol 69 (4) ◽  
pp. 345-354 ◽  
Author(s):  
Sakthisharmila Palanisamy ◽  
Palanisamy Nachimuthu ◽  
Mukesh Kumar Awasthi ◽  
Balasubramani Ravindran ◽  
Soon Woong Chang ◽  
...  
Keyword(s):  
Oxygen Demand ◽  
Electrical Energy ◽  
Reactive Dye ◽  
Product Formation ◽  
Electrochemical Treatment ◽  
Electrochemical Process ◽  
Spectral Studies ◽  
Textile Dye ◽  
Electrode Consumption ◽  
Electrocoagulation Process

Abstract Textile effluents contain triazine-substituted reactive dyes that cause health problems such as cancer, birth defects, and hormone damage. An electrochemical process was employed effectively to degrade azo reactive dye with the aim of reducing the production of carcinogenic chemicals during biodegradation. Textile dye C.I. Reactive Red 2 (RR2), a model pollutant that contains dichloro triazine ring, was subjected to the electrocoagulation process using aluminium (Al) electrodes. A maximum of 97% of colour and 72% of chemical oxygen demand (COD) removal efficiencies were achieved and 9.5 kWh/kg dye electrical energy and 0.8 kg Al/kg dye electrode consumption were observed. The dye removal mechanism was studied by analysing the results of UV-Vis spectra of RR2 and treated samples at various time intervals during electrocoagulation. Fourier transform infrared (FTIR) spectra and energy dispersive X-ray (EDX) spectral studies were used for analysing the electrocoagulated flocs. The results indicate that in this process the dye gets removed by adsorption and there is no significant carcinogenic by-product formation during the degradation of dye.

scholarly journals Electrochemical Degradation of Crystal Violet Using Ti/Pt/SnO2 Electrode

2021 ◽  
Vol 11 (18) ◽  
pp. 8401
Author(s):  
Rachid El Brychy ◽  
Mohamed Moutie Rguiti ◽  
Nadia Rhazzane ◽  
Moulay Driss Mellaoui ◽  
Khalid Abbiche ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Crystal Violet ◽  
Current Density ◽  
Ph Value ◽  
Supporting Electrolyte ◽  
Chloride Concentration ◽  
Oxygen Demand ◽  
Electrochemical Treatment ◽  
Electrochemical Process ◽  
Initial Ph

Today, organic wastes (paints, pigments, etc.) are considered to be a major concern for the pollution of aqueous environments. Therefore, it is essential to find new methods to solve this problem. This research was conducted to study the use of electrochemical processes to remove organic pollutants (e.g., crystal violet (CV)) from aqueous solutions. The galvanostatic electrolysis of CV by the use of Ti/Pt/SnO2 anode, were conducted in an electrochemical cell with 100 mL of solution using Na2SO4 and NaCl as supporting electrolyte, the effect of the important electrochemical parameters: current density (20–60 mA cm−2), CV concentration (10–50 mg L−1), sodium chloride concentration (0.01–0.1 g L−1) and initial pH (2 to 10) on the efficiency of the electrochemical process was evaluated and optimized. The electrochemical treatment process of CV was monitored by the UV-visible spectrometry and the chemical oxygen demand (COD). After only 120 min, in a 0.01mol L−1 NaCl solution with a current density of 50 mA cm−2 and a pH value of 7 containing 10 mg L−1 CV, the CV removal efficiency can reach 100%, the COD removal efficiency is up to 80%. The process can therefore be considered as a suitable process for removing CV from coloured wastewater in the textile industries.

Inhibited Antibiotic-Resistant and Electrochemical Treatment of Pharmaceutical Wastewater

2021 ◽  
pp. 1362-1383
Author(s):  
Isaiah Adesola Oke ◽  
Fehintola Ezekiel Oluwaseun ◽  
Justinah S. Amoko ◽  
Salihu Lukman ◽  
Adekunbi Enoch Adedayo
Keyword(s):  
Treatment Time ◽  
Oxygen Demand ◽  
Electrochemical Treatment ◽  
Separation Distance ◽  
Electrochemical Process ◽  
Treatment Technique ◽  
Antibiotic Resistant ◽  
Industrial Wastewaters ◽  
Chemical Treatments ◽  
Treatment Conditions

The main aim of this chapter is to conduct a simple literature review on treatment wastewaters from pharmaceutical and related industries and establish efficacies of electrochemical treatment technique in removing selected pollutants form raw wastewater. Synthetic (simulated) wastewaters were prepared using standard methods. Fractional factorial (2K - P -1) experiments were utilized at random to determine influence of selected factors (separation distance between the electrodes, volume of the wastewater used, applied current, temperature of the wastewater, treatment time, concentration of the pollutant, concentration calcium of hypochrite (Ca(OCl)2) added and depth of the electrode into the wastewater used) on efficiency of electrochemical process in removing Biochemical Oxygen Demand concentration at five (BOD5). Industrial wastewaters were collected from industrial sources within the country (Nigeria). The industrial wastewaters collected were subjected to electrochemical treatment and chemical treatments individually and in combinations under specified treatment conditions.

Development of a system for treatment of coconut industry wastewater using electrochemical processes followed by Fenton reaction

2014 ◽  
Vol 69 (11) ◽  
pp. 2258-2264 ◽  
Author(s):  
Lúcio de Moura Gomes ◽  
José Leandro da Silva Duarte ◽  
Nathalia Marcelino Pereira ◽  
Carlos A. Martínez-Huitle ◽  
Josealdo Tonholo ◽  
...  
Keyword(s):  
Fenton Reaction ◽  
New Technologies ◽  
Liquid Waste ◽  
Oxygen Demand ◽  
Industrial Effluents ◽  
Electrochemical Treatment ◽  
Electrochemical Process ◽  
Synthetic Wastewater ◽  
Processing Industry ◽  
Electrochemical Processes

The coconut processing industry generates a significant amount of liquid waste. New technologies targeting the treatment of industrial effluents have emerged, including advanced oxidation processes, the Fenton reaction, and electrochemical processes, which produce strong oxidizing species to remove organic matter. In this study we combined the Fenton reaction and electrochemical process to treat wastewater generated by the coconut industry. We prepared a synthetic wastewater consisting of a mixture of coconut milk and water and assessed how the Fenton reagents' concentration, the cathode material, the current density, and the implementation of associated technologies affect its treatment. Electrochemical treatment followed by the Fenton reaction diminished turbidity and chemical oxygen demand (COD) by 85 and 95%, respectively. The Fenton reaction followed by the electrochemical process reduced turbidity and COD by 93 and 85%, respectively. Therefore, a combination of the Fenton and electrochemical technologies can effectively treat the effluent from the coconut processing industry.

Simultaneous COD and Nitrogen Removal in Up-Flow Microaerobic-Oxic (M/O) Process for Domestic Wastewater Treatment

2013 ◽  
Vol 838-841 ◽  
pp. 2739-2744
Author(s):  
Shuang Zhao ◽  
Cui Ping Wang
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Energy Use ◽  
Particle Diameter ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Ammonium Nitrogen ◽  
Domestic Wastewater Treatment ◽  
Stable Performance ◽  
Biological Nitrogen

A novel process for improving the energy use and treatment efficiency of the biological nitrogen removal process, up-flow microaerobic-oxic (M/O) process which is composed of up-flow micro-aerobic and aeration was proposed based on a laboratory scale for domestic wastewater treatment, the dissolved oxygen (DO) in up-flow micro-aerobic was in the range of (0~0.5) mg/L. The M/O process performance under different hydraulic retention time (HRT) and Internal return ratio (r) was investigated. Under the optimal conditions, the average removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN) and ammonium nitrogen (NH4+-N) were 89.1%, 64.1%, and 96.6 % with effluent concentrations of COD, TN and NH4+-N less than 50,15 and 8mg/L, respectively. The distribution of sludge particles diameter and microbial activity of activated sludge were also measured, the mean particle diameter was in the range of 180~250μm and the SOURT was 13.11 mgO2/(gMLVSSh). Up-flow micro-aerobic (M/O) reactor has the advantages of more stable performance and better resistance to the load shock than the conventional A/O process within continuous running period of 130 days.

scholarly journals Biodegradation of Emerging Pharmaceuticals from Domestic Wastewater by Membrane Bioreactor: The Effect of Solid Retention Time

2021 ◽  
Vol 18 (7) ◽  
pp. 3395
Author(s):  
Raghad Asad Kadhim ALOBAIDI ◽  
Kubra ULUCAN-ALTUNTAS ◽  
Rasha Khalid Sabri MHEMID ◽  
Neslihan MANAV-DEMIR ◽  
Ozer CINAR
Keyword(s):  
Biological Treatment ◽  
Membrane Bioreactor ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Pharmaceutical Compounds ◽  
Membrane Bioreactors ◽  
Solid Retention Time ◽  
Effluent Quality ◽  
Treatment Processes ◽  
By Products

Although conventional biological treatment plants can remove basic pollutants, they are ineffective at removing recalcitrant pollutants. Membrane bioreactors contain promising technology and have the advantages of better effluent quality and lower sludge production compared to those of conventional biological treatment processes. In this study, the removal of pharmaceutical compounds by membrane bioreactors under different solid retention times (SRTs) was investigated. To study the effect of SRT on the removal of emerging pharmaceuticals, the levels of pharmaceuticals were measured over 96 days for the following retention times: 20, 30, and 40-day SRT. It was found that the 40-day SRT had the optimum performance in terms of the pharmaceuticals’ elimination. The removal efficiencies of the chemical oxygen demand (COD) for each selected SRT were higher than 96% at steady-state conditions. The highest degradation efficiency was observed for paracetamol. Paracetamol was the most removed compound followed by ranitidine, atenolol, bezafibrate, diclofenac, and carbamazepine. The microbial community at the phylum level was also analyzed to understand the biodegradability of pharmaceuticals. It was noticed that the Proteobacteria phylum increased from 46.8% to 60.0% after 96 days with the pharmaceuticals. The Actinobacteria class, which can metabolize paracetamol, carbamazepine, and atenolol, was also increased from 9.1% to 17.9% after adding pharmaceuticals. The by-products of diclofenac, bezafibrate, and carbamazepine were observed in the effluent samples.

scholarly journals Recycling of rural abandoned constructed wetlands: mariculture wastewater treatment

2021 ◽  
Author(s):  
Yu Xin ◽  
Lin Liu ◽  
Lili Wei ◽  
Xu Huang ◽  
Chaoxiang Liu
Keyword(s):  
Bacterial Community ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Ammonium Nitrogen ◽  
Operating Conditions ◽  
Maximum Adsorption Capacity ◽  
Marine Aquaculture ◽  
Significant Difference ◽  
The Family ◽  
Dominant Bacteria

Abstract This study aimed to investigate the behavioral shifts of constructed wetland (CW) when the treated water was changed from domestic wastewater to mariculture wastewater. The results showed that the average removal efficiencies of ammonium nitrogen (), total nitrogen and chemical oxygen demand (COD) were 29.54, 46.07 and 57.15% in mariculture wastewater, respectively, which were significantly lower than those in domestic wastewater (71.35, 66.34 and 74.98%, respectively). While there was no significant difference in the removal efficiency of nitrate and phosphate (P > 0.05) between the two systems. Based on the analysis of bacterial community and adsorption properties, the results further indicated that the removal mechanism of between both systems was mainly due to substrate adsorption: the maximum adsorption capacity of on the substrate in mariculture wastewater was 5,432 mg kg−1, whereas that in domestic wastewater was 18,033 mg kg−1. In terms of bacterial communities, the dominant bacteria at the family level were Victivallaceae (18.63%) in domestic wastewater and Porphyromonadaceae (18.37%) in mariculture wastewater, which showed the significant alteration to the bacterial community. In conclusion, this study showed that conventional CW could be used for treating wastewater from land-based marine aquaculture, while the operating conditions needed to be optimized in the process of application.

scholarly journals The pollution load of wastewater and the performance of the sewage treatment plant of Skhirat city

2020 ◽  
Vol 150 ◽  
pp. 02010
Author(s):  
Mehdi Bouhafa ◽  
Omar El Rhaouat ◽  
Mostapha Lakhlifi ◽  
Sakina Belhamidi ◽  
Azzedine El Midaoui ◽  
...  
Keyword(s):  
Biological Treatment ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
P Value ◽  
Pollution Load ◽  
Pollutant Load ◽  
Level Of Significance

The Sewage Treatment Plant (STEP) based on Skhirat City receive on average an important volume of wastewater (about 66473 m3 with a flow of 2173.56 m3/day). The aim of this research is to evaluate the pollutant load of wastewater and the performances of the sewage treatment plant of Skhirat city in treating domestic wastewater. Sampling was carried out on the level of the entry of sewage treatment plant with a monthly rate. The analyses were carried at the laboratory with the cubic measure of wastewater received by the sewage treatment plant. The results show that the CODe/BOD5e ratio of 2.08, which makes it possible to confirm the normal state of the station in biological treatment since the ratio is lower than three. The results showed that the rate of the Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD5) and the Suspended Matter (SM) respectively it’s of the order 87,4%, 90,68% and 79,50%. Globally, the results of the investigation revealed by the unilateral test Student, that this difference between the entry and the exit of the station which significant by p-value calculated is lower than the level of significance alpha= 0,05.

scholarly journals STUDY ON ADVANCED TREATMENT OF WASTEWATER BY ULTRA FILTRATION FOR REUSING PURPOSE – ON-SITE PILOTS

2020 ◽  
Vol 58 (5A) ◽  
pp. 160
Author(s):  
Tran Thuy Anh ◽  
Tran Duc Minh Hai ◽  
Nguyen Danh Tien ◽  
Tran Duc Ha
Keyword(s):  
Coal Mining ◽  
Suspended Solids ◽  
Reclaimed Water ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Ammonium Nitrogen ◽  
Advanced Treatment ◽  
Domestic Water ◽  
Ultra Filtration ◽  
Mining Wastewater

Reclaimed water has been greatly applied worldwide recently to augment water supply for non-potable domestic purpose. The present study put an effect on assessing the application of ultra-filtration (UF) on advanced treatment following conventional domestic wastewater treatment and coal mining wastewater for reusing purpose. On-site advanced treatment pilots using UF membrane with the capacity of 1 – 1.5 m3/h were built to treat decentralized domestic wastewater which has a low concentration of organic matters and coal mining wastewater which is abated by chemical-physical process and advanced treatment train. Dissolved oxygen (DO), pH, Chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS), volatile suspended solids (VSS), Total Nitrogen (TN) and ammonium-nitrogen (NH4-N) in domestic wastewater and TSS, iron (Fe), manganese (Mn), and hardness of coal mining wastewater were analyzed. The pollutants in domestic wastewater were reduced significantly as of 82% TSS, 86% BOD5, 82% COD, and 96% NH4-N. The removal efficiency in coal mining wastewater reached 93.5% TSS, 67% iron, 68% manganese, and 52% hardness. The analyzed parameters in permeate of both pilots met legislation thresholds of Vietnam technical regulation on domestic water quality, proving that reclaimed water treated by UF can be used for non-potable domestic purposes.

scholarly journals Characteristics of rural domestic wastewater with source separation

2020 ◽  
Author(s):  
Fangkui Cheng ◽  
Zheqin Dai ◽  
Shuting Shen ◽  
Siyu Wang ◽  
Xiwu Lu
Keyword(s):  
Source Separation ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Ammonium Nitrogen ◽  
Lake Basin ◽  
Household Level ◽  
Pollutant Concentrations ◽  
Water Closet ◽  
Alternative Water ◽  
Production Coefficient

Abstract Rural domestic wastewater (RDW), one of the non-point pollution sources, has become a significant object related to sanitation improvement and water pollution control in Taihu Lake Basin, China. Current research on RDW characteristics and management with source separation is limited. In this study, a source-separated investigation into the characteristics of RDW was conducted, and the management suggestions were proposed. The results showed that the average RDW production coefficient was 94.1 ± 31.6 (range: 71.8–143.0) liters per capita (person) per day. Household-level wastewater generation peaked two or three times daily, and the synchronous fluctuation could cause hydraulic loading shocks to treatment facilities. The population equivalents of chemical oxygen demand, ammonium nitrogen (NH4+–N), total nitrogen (TN), and total phosphorus (TP) in RDW were 78.7, 3.7, 4.12, and 0.8 g/(cap·d), respectively. Blackwater from water closet source accounted for 30.4% of the total wastewater amount, contributing 93.0%, 81.7%, and 67.3% to loads of NH4+-N, TN, and TP, respectively. Graywater from the other sources with low nutrient-related pollutant concentrations and loads, accounting for 69.6% of the total wastewater amount, was a considerable alternative water resource. The quantitative and qualitative characteristics indicated that GW and BW had the potential of being reused in relation to water and nutrients, respectively.

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