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Your search keyword '"Gu, Xiaoyang"' showing total 5 results
Start Over Author "Gu, Xiaoyang" Topic chemical oxygen demand
5 results on '"Gu, Xiaoyang"'

1. Combined ozone oxidation and biological aerated filter processes for treatment of cyanide containing electroplating wastewater

Author

Jian Lei, Yuan Yanlei, Jiaqi Cui, Gu Xiaoyang, Guo Xunwen, and Wang Xiaojun

Subjects
Ozone, Hydraulic retention time, Chemistry, General Chemical Engineering, Cyanide, Chemical oxygen demand, Inorganic chemistry, General Chemistry, Industrial and Manufacturing Engineering, chemistry.chemical_compound, Bioreactor, Environmental Chemistry, Aeration, Electroplating, Effluent
Abstract

In this study, combined ozone oxidation and biological aerated filter (BAF) processes treating cyanide containing electroplating wastewater was investigated. The combined process of first BAF–ozone–second BAF (BAF1–O 3 –BAF2) was proved the optimal combined way. Under the optimal condition of 100 mg/L ozone dosage, BAF1 HRT (hydraulic retention time) 9 h and BAF2 HRT 6 h, the CN − , COD (chemical oxygen demand), Cu 2+ and Ni 2+ removal efficiencies were 99.7%, 81.7%, 97.8% and 95.3%, respectively and the effluent CN − , COD, Cu 2+ and Ni 2+ concentrations of 0.16 mg/L, 55.0 mg/L, 0.38 mg/L and 0.41 mg/L, respectively satisfied the discharge standard for electroplating (China). The results show that BAF1 can tolerate higher cyanide toxicity than some other bioreactors. Furthermore, the addition of glucose into raw electroplating wastewater (EPWW) could increase contaminants removal efficiencies of BAF1. Cyanide compounds of EPWW could be used as the nitrogen source for the microorganisms.

Published
2014

2. Application of integrated ozone biological aerated filters and membrane filtration in water reuse of textile effluents

Author

He Yaozhong, Jinli Yan, Gu Xiaoyang, Qilong Ge, Wang Xiaojun, Jinling Xu, and Jian Lei

Subjects
Biochemical oxygen demand, Osmosis, Environmental Engineering, Ozone, Bioengineering, Wastewater, law.invention, chemistry.chemical_compound, law, Water Quality, Recycling, Reverse osmosis, Waste Management and Disposal, Filtration, Biological Oxygen Demand Analysis, Suspended solids, Renewable Energy, Sustainability and the Environment, Chemistry, Textiles, Chemical oxygen demand, Environmental engineering, Membranes, Artificial, General Medicine, Aerobiosis, Biodegradation, Environmental, Costs and Cost Analysis, Dyeing, Aeration, Water Pollutants, Chemical
Abstract

A combined process including integrated ozone-BAFs (ozone biological aerated filters) and membrane filtration was first applied for recycling textile effluents in a cotton textile mill with capacity of 5000 m 3 /d. Influent COD (chemical oxygen demand) in the range of 82–120 mg/L, BOD 5 (5-day biochemical oxygen demand) of 12.6–23.1 mg/L, suspended solids (SSs) of 38–52 mg/L and color of 32–64° were observed during operation. Outflows with COD ⩽ 45 mg/L, BOD 5 ⩽ 7.6 mg/L, SS ⩽ 15 mg/L, color ⩽ 8° were obtained after being decontaminated by ozone-BAF with ozone dosage of 20–25 mg/L. Besides, the average removal rates of PVA (polyvinyl alcohol) and UV 254 were 100% and 73.4% respectively. Permeate water produced by RO (reverse osmosis) could be reused in dyeing and finishing processes, while the RO concentrates could be discharged directly under local regulations with COD ⩽ 100 mg/L, BOD 5 ⩽ 21 mg/L, SS ⩽ 52 mg/L, color ⩽ 32°. Results showed that the combined process could guarantee water reuse with high quality, and solve the problem of RO concentrate disposal.

Published
2013

3. Pilot study on the advanced treatment of landfill leachate using a combined coagulation, fenton oxidation and biological aerated filter process

Author

Wang, Xiaojun, Chen, Sili, Gu, Xiaoyang, and Wang, Kaiyan

Subjects
*PILOT projects, *SEWAGE purification, *WASTEWATER treatment, *COAGULATION, *OXIDATION, *FILTERS & filtration, *CHEMICAL oxygen demand, *BIODEGRADATION, *LEACHATE
Abstract

Mature landfill leachate is typically non-biodegradable. A combination process was developed that includes coagulation, Fenton oxidation, and biological aerated filtering to treat biologically-produced effluent. In this process, coagulation and Fenton oxidation were applied in order to reduce chemical oxygen demand (COD) organic load, and enhance biodegradability. Poly-ferric sulfate (PFS) at 600 mgl−1 was found to be a suitable dosage for coagulation. For Fenton oxidation, an initial pH of 5, a total reaction time of 3h, and an H2O2 dosage of 5.4mmoll−1, with a (H2O2)/n(Fe2+) ratio of 1.2 and two-step dosing were selected to achieve optimal oxidation. Under these optimal coagulation and Fenton oxidation conditions, the COD removal ratios were found to be 66.67% and 56%, respectively. Following pretreatment with coagulation and Fenton oxidation, the landfill leachate was further treated using a biological aerated filter (BAF). Our results show that COD was reduced to 75mgl−1, and the color was less than 10 degrees. [Copyright &y& Elsevier]

Published
2009
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4. Pilot study of nitrogen removal from landfill leachate by stable nitritation-denitrification based on zeolite biological aerated filter.

Author

Chen, Zhenguo, Wang, Xiaojun, Chen, Xiaokun, Yang, Yongyuan, and Gu, Xiaoyang

Subjects
*LEACHATE, *NITRITES, *AMMONIA-oxidizing bacteria, *CHEMICAL oxygen demand, *LANDFILLS, *LANDFILL management, *PILOT projects, *NITROGEN
Abstract

• Stable nitritation was achieved by pilot-scale ZBAF for landfill leachate. • Free ammonia inhibition should be the main reason for efficient nitritation in ZBAF. • Microbial community analysis revealed AOB enrichment and NOB elimination in ZBAF. A pilot (about 1 m3/d) process consisting of pre-denitrification and zeolite biological aerated filter (ZBAF) was established and run for nitrogen removal of landfill leachate. The results showed that stable nitritation and denitrification was achieved for landfill leachate with removal efficiency of Chemical Oxygen Demand (COD Cr), ammonium and total nitrogen (TN) of 53.2 ± 3.0%, 93.5 ± 2.4% and 74.7 ± 9.4%, respectively. Based on the ammonium adsorption equilibrium by zeolite, stable free ammonia could be maintained for inhibition of nitrite oxidizing bacteria (NOB) and dominance of ammonia oxidizing bacteria (AOB) in ZBAF, resulting in efficient nitritation with a nitrite accumulation ratio higher than 90.0% and an average nitrite production rate of 1.387 kg NO 2 −-N m−3 day−1. High-throughput sequencing analysis further revealed enrichment of AOB and elimination of NOB in ZBAF. Compared to two-stage anoxic-oxic process, the pilot-scale process could save approximate 5000 mg/L glucose (about 3.10 US dollar/m3) with almost similar TN removal performance. All results obtained demonstrated the feasibility of the pilot process, which might be highly promising for the nitritation and denitrification of low C/N landfill leachate in the future. [ABSTRACT FROM AUTHOR]

Published
2019
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5. Combined processes of two-stage Fenton-biological anaerobic filter–biological aerated filter for advanced treatment of landfill leachate

Author

Wang, Xiaojun, Han, Jijun, Chen, Zhiwei, Jian, Lei, Gu, Xiaoyang, and Lin, Che-Jen

Subjects
*AERATED package treatment systems, *LANDFILLS, *LEACHATE, *ORGANIC compounds, *CHEMICAL oxygen demand, *POLLUTION control industry, *MUNICIPAL solid waste incinerator residues
Abstract

Abstract: There are numerous non-biodegradable organic materials in the mature landfill leachate. To meet the new discharge standard of China, additional advanced treatment is needed for the effluent from the biological treatment processes of leachate. In this study, a combined process including two stages of “Fenton-biological anaerobic filter (BANF)–biological aerated filter (BAF)” was evaluated to address the advanced treatment need. The Fenton oxidation was applied to reduce chemical oxygen demand (COD) and enhance biodegradability of refractory organics, and the BANF–BAF process was then applied to remove the total nitrogen (TN). The treatment achieved effluent concentrations of COD<70mg/L, TN<40mg/L and NH3–N<10mg/L. The removal efficiency of COD and TN were 96.1% and 95.9%, respectively. The effluent quality met the new discharge standard for Pollution Control on the Landfill Site of Municipal Solid of PR China (GB16889-2008). The operation cost of these processes was about 36.1CHY/t (5.70USD/t). [Copyright &y& Elsevier]

Published
2012
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