scholarly journals Effect of sulfate removal in a high sulfate volumetric loading micro-aerobic bio-reactor and study of subsequent bio-sulfur adsorption by iron-modified activated carbon

RSC Advances ◽  
2020 ◽  
Vol 10 (25) ◽  
pp. 14542-14549
Author(s):  
Ziyu Liu ◽  
Rong Xue ◽  
Yunqian Ma ◽  
Lihua Zang ◽  
Jiasheng Zhuang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Modified Activated Carbon ◽  
Sulfate Removal ◽  
High Sulfate ◽  
Sulfur Adsorption ◽  
Volumetric Loading ◽  
P Removal

Removal of sulfide from a micro-aerobic bio-reactor was studied at 10 000 mg L−1 chemical oxygen demand (COD) of inlet water, with the sulfate volumetric loading 0.75, 1.0, 1.5 and 2.0 kg (m−3 d−1), respectively.

scholarly journals Synthesis and properties of zeolite/N-doped porous carbon for the efficient removal of chemical oxygen demand and ammonia-nitrogen from aqueous solution

RSC Advances ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 6452-6459 ◽  
Author(s):  
Guangzhi Xin ◽  
Min Wang ◽  
Lin Chen ◽  
Yuzhou Zhang ◽  
Meicheng Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Chemical Oxygen Demand ◽  
Porous Carbon ◽  
Mesoporous Carbon ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Efficient Removal ◽  
Porous Activated Carbon

A novel adsorbent zeolite/N-doped porous activated carbon (ZAC) was prepared by the synthesis of zeolite and mesoporous carbon to remove ammonia nitrogen (NH4+–N) and chemical oxygen demand (COD) from aqueous solution.

scholarly journals Occurrence and Succession of Bacterial Community in O3/BAC Process of Drinking Water Treatment

2019 ◽  
Vol 16 (17) ◽  
pp. 3112 ◽  
Author(s):  
Sheng Dong ◽  
Lijun Liu ◽  
Yuxiu Zhang ◽  
Fajun Jiang
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
Bacterial Community ◽  
Dissolved Oxygen ◽  
Chemical Oxygen Demand ◽  
Bacterial Communities ◽  
Oxygen Demand ◽  
Drinking Water Treatment ◽  
Turbidity Removal ◽  
N Removal

In the drinking water industry, a common advanced treatment process is comprised of treatment with ozone, followed by biological-activated carbon (O3/BAC). However, the bacterial community formation and succession procedures associated with activated carbon have rarely been reported. In this study, the dynamics of bacterial communities at three different depths were investigated using a pilot-scale O3/BAC filter. The average chemical oxygen demand (CODMn), turbidity removal and dissolved oxygen (DO) consumption rate of the filter were 26.43%, 16.57% and 16.4% during the operation period, respectively. Bacterial communities dominated by proteobacteria and Bacteroidetes attached on activated carbon were determined by polymerase chain reaction-density gradient gel electrophoresis (PCR-DGGE). Principal component analysis (PCA) revealed that the compositions and structures of bacterial communities in different layers clustered after fluctuation. A redundancy analysis (RDA) indicated that Ramlibacter henchirensis was positively correlated to chemical oxygen demand (CODMn) removal and nitrate-N removal, and Georgfuchsia toluolica also showed a positive correlation with CODMn removal. Aquabacterium parvum and Phaeobacterium nitratireducens were positively-correlated with turbidity removal. Pedobacter glucosidilyticus and Pseudomonas sp. were associated with high dissolved oxygen (DO) consumption. These results provide insight into the succession characteristics of the bacterial community of O3/BAC treatment and the interactions of the bacterial community with filter operation performance.

Coupling of anodic oxidation and adsorption by granular activated carbon for chemical oxygen demand removal from 4,4′-diaminostilbene-2,2′-disulfonic acid wastewater

2010 ◽  
Vol 62 (11) ◽  
pp. 2669-2677 ◽  
Author(s):  
Lizhang Wang ◽  
Yuemin Zhao
Keyword(s):  
Activated Carbon ◽  
Chemical Oxygen Demand ◽  
Residence Time ◽  
Applied Voltage ◽  
Oxygen Demand ◽  
Granular Activated Carbon ◽  
Cod Removal ◽  
Disulfonic Acid ◽  
High Concentration ◽  
Solution Ph

Experiments were performed to reduce chemical oxygen demand (COD) from 4,4′-diaminostilbene-2,2′-disulfonic (DSD) acid manufacturing wastewater using electrochemical oxidation coupled with adsorption by granular activated carbon. The COD removal is affected by the residence time and applied voltage. When the residence time is increased, lower value of COD effluent could be obtained, however, the average current efficiency (ACE) decreased rapidly, and so does the applied voltage. In addition, aeration could effectively enhance COD removal efficiency and protect anodes from corrosion. Furthermore, the acidic condition is beneficial to the rapid decrease of COD and the values of pH effluent are independent of the initial solution pH. The optimization conditions obtained from these experiments are applied voltage of 4.8 V, residence time of 180 min and air–liquid ratio of 4.2 with the COD effluent of about 690 mg L−1. In these cases, the ACE and energy consumption are 388% and 4.144 kW h kg−1 COD, respectively. These perfect results from the experiments illustrate that the combined process is a considerable alternative for the treatment of industrial wastewater containing high concentration of organic pollutants and salinity.

scholarly journals Study on the Treatment of Circulating Water: PPy/PAN-based Activated Carbon Fiber Felt Composite as Electro-adsorption Electrode

2015 ◽  
Vol 18 (1) ◽  
pp. 001-004 ◽  
Author(s):  
Yang Liu ◽  
Junbo Zhou ◽  
Jing Wang
Keyword(s):  
Activated Carbon ◽  
Carbon Fiber ◽  
Chemical Oxygen Demand ◽  
Composite Electrode ◽  
Oxygen Demand ◽  
Activated Carbon Fiber ◽  
Circulating Water ◽  
Carbon Fiber Felt

This study adopted PPy/PAN-based carbon fiber felt composite as a new electrode for desalination experiment. The result shows that this kind of composite electrode can significantly reduce the outlet conductivity when inlet chemical oxygen demand (COD) is over 300 mg/l. It additionally reduces COD to the value obtained with other electrodes.

scholarly journals Reduction of Chemical Oxygen Demand (COD) Effluent of Plastic Recycling Processing Plant using LD Slag

2019 ◽  
Vol 8 (4) ◽  
pp. 6750-6755
Keyword(s):  
Particle Size ◽  
Activated Carbon ◽  
Chemical Oxygen Demand ◽  
Contact Time ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Foam Fractionation ◽  
Processing Plant ◽  
Plastic Recycling ◽  
Ld Slag

In wastewater plastic recycling processing plant, commonly contain high chemical oxygen demand (COD) concentration. Coagulation-flocculation, adsorption and foam fractionation are the examples of treatment processes that can reduce COD concentration in wastewater. Steel slag can be used as an alternative to remove COD concentration of wastewater adsorption process. Linz-Donawitz (LD) slag can be obtained from steel manufacturing plant. LD slag also contains alkali oxides, porous characteristic, large surface area and contain an easy solid-liquid separation. This research is to study the percentage reduction of COD in wastewater using LD slag as adsorbent. This research will investigate the effect of particle size, dosage amount and contact time between LD slag and COD reduction. From the experiment, the highest percentage COD removal for particle size is 0.2mm, the dosage amount is 6 gram and the contact time is at 60 min. Comparison of COD removal by using coagulation -flocculation, adsorption using activated carbon and adsorption using LD slag processes was done. LD slag can reduce 2% higher of COD compared to activated carbon. LD slag should be invested more in wastewater treatment process.

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