scholarly journals Application of Ozone and Oxygen to Reduce Chemical Oxygen Demand and Hydrogen Sulfide from a Recovered Paper Processing Plant

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Patricia A. Terry
Keyword(s):  
Hydrogen Sulfide ◽  
Chemical Oxygen Demand ◽  
Contact Time ◽  
Oxygen Demand ◽  
Gas Production ◽  
Injection System ◽  
Processing Plant ◽  
Short Contact Time ◽  
Production Of Hydrogen ◽  
Fox River

A pilot study was performed at the Fox River Fiber recovered paper processing company in DePere, Wisconsin, to determine the extent to which injection of oxygen and ozone could reduce the high chemical oxygen demand, COD, in the effluent and the effectiveness of the ozone/oxygen stream in suppressing production of hydrogen sulfide gas in downstream sewage lines. Adaptive Ozone Solutions, LLC, supplied the oxygen/ozone generation and injection system. Samples were analyzed both before and after oxygen/ozone injection. Hydrogen sulfide gas was continuously monitored at sewer stations downstream of Fox River Fiber. Results showed that with a very short contact time, effluent COD was reduced by over 15%. A simple kinetic model predicts that a contact time of fewer than 30 minutes could reduce COD by as much as 60%. In addition, downstream hydrogen sulfide gas production in the sewage mains was also better controlled, such that costly Bioxide applications could be reduced.

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.

scholarly journals Comparison between the coagulants surfactant modified bentonite, combination chitosan-natural bentonite and combination chitosan-modified bentonite for peat water treatment

2014 ◽  
Vol 4 (3) ◽  
pp. 194-208 ◽  
Author(s):  
Nor Farhana Zakaria Siti ◽  
S. Syafalni ◽  
Qamaruz Zaman Nastaein
Keyword(s):  
Water Treatment ◽  
Water Supply ◽  
Chemical Oxygen Demand ◽  
Rural Areas ◽  
Contact Time ◽  
Oxygen Demand ◽  
Modified Bentonite ◽  
Water Characteristics ◽  
Surface Method ◽  
Optimal Reaction

Peat water is an abundant water resource in Asia, especially in rural areas. However, it is unsuitable to be used as a commercial water supply. Monitoring peat water characteristics at Beriah swamp, Perak, recorded colour (238 PtCo), turbidity (12.86 NTU), iron (0.89 mg/L), pH (4.8) and chemical oxygen demand (COD) (27 mg/L) over the national limitation standards. In this study, surfactant modified bentonite (SMB) shows high removal of colour (95%), turbidity (97%) and iron (100%) from peat water, but not COD (almost non-removal). From the results obtained, treatment of peat water using a combination of chitosan-natural bentonite was more efficient by the resulting optimal removal for all parameters such as colour (78%), turbidity (89%), iron (90%) and COD (67%). Meanwhile, a combination of chitosan-SMB gave similar results as SMB alone; however, reducing the amount of pollutants used in combination was advantageous in this combination. The response surface method was applied and the optimal reaction between coagulant and sample due to pH, dosage and contact time was determined.

scholarly journals Electrocoagulación en el agua de proceso de una Industria de alimentos

2019 ◽  
pp. 48-52
Author(s):  
María Guadalupe Martin del Campo-Sanchez ◽  
José Luis Escobar-Gonzalez
Keyword(s):  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Contact Time ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Statistical Test ◽  
Parallel Plates ◽  
Cost Of Treatment ◽  
Approximate Cost

The main objective was to develop a wastewater treatment system by means of the electrocoagulation method according to the parameters of Chemical Oxygen Demand (COD) and Total Suspended Solids (SST). The results obtained were that at a pH of 6 and 7 with a contact time of 30 minutes, the highest percentage of removal of SST (98%) and COD (90%) was obtained. Once the conductor was selected, tests were carried out at different pH (6, 7 and 8) with contact times of 15, 30 and 45 minutes each, at 12 V and 0.4 A. A Multifactorial ANOVA statistical test was performed to determine if there were significant differences between the treatments. Once the results were evaluated, a prototype of approximately 38 L was designed with parallel plates with results of removal of SST of 93% and COD of 66%. The approximate cost of treatment per cubic meter is $ 35

STUDIES ON THE BIOLOGICAL STABILIZATION OF THIN STILLAGE: II. ANAEROBIC FERMENTATION

1965 ◽  
Vol 11 (5) ◽  
pp. 791-795 ◽  
Author(s):  
T. R. Fargey ◽  
R. E. Smith
Keyword(s):  
Chemical Oxygen Demand ◽  
Anaerobic Fermentation ◽  
Oxygen Demand ◽  
Gas Production ◽  
Methane Content ◽  
Anaerobic Sludge ◽  
Thin Stillage ◽  
Aerobic Fermentation ◽  
Sewage Disposal ◽  
Anaerobic Decomposition

Sedimented solids, obtained as a slurry after the aerobic fermentation of thin stillage, were subjected to anaerobic decomposition in stirred culture. The solids were added gradually in increasing increments to anaerobic sludge from a sewage disposal plant for purposes of acclimatization. The fermentation resulted in the generation of large volumes of gas with a methane content of 70% and a reduction in chemical oxygen demand of approximately 65%. Gas production was somewhat inferior to that obtained during anaerobic decomposition of "raw" thin stillage solids.

scholarly journals Peningkatan Kualitas Biogas Melalui Proses Pemurnian Dengan Purifier Bertingkat Seri Menggunakan Adsorben Arang Aktif Dan Zeolit

2021 ◽  
Vol 14 (1) ◽  
pp. 1-14
Author(s):  
Abdul Mukhlis Ritonga ◽  
Masrukhi Masrukhi ◽  
Ahmad Mafrukhi
Keyword(s):  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Activated Charcoal ◽  
Oxygen Demand ◽  
Total Solid ◽  
Gas Production ◽  
Gas Content ◽  
Volatile Solid ◽  
Methane Gas

Abstrak. Biogas merupakan gas yang dihasilkan dari bahan organik melalui proses fermentasi. Energi yang terkandung dalam biogas tergantung dari konsentrasi metana (CH4). Semakin tinggi kandungan metana maka semakin besar kandungan energi pada biogas. Salah satu cara untuk meningkatkan kandungan gas metana pada biogas serta dapat menurunkan gas-gas pengotor seperti CO2, dan gas-gas lain yang tidak terpakai dengan pemurnian menggunakan purifier yang telah di isi adsorben, pada penelitian ini adsorben yang digunakan yaitu arang aktif dan zeolit. Variabel yang diukur dalam penelitian ini yaitu C/N rasio, pH, suhu, total solid (TS), volatile solid (VS), Biochemical Oxygen Demand (BOD) dan Chemical Oxygen Demand (COD) yang berpengaruh dalam produksi gas metan. Kadar  CH4 dan CO2 setelah dimurnikan, dan waktu optimal untuk proses pemurnian biogas, perlakuan yang diberikan menggunakan 3 waktu pengujian, yaitu 30, 60, dan 90 menit. Percobaan dilakukan pengulangan sebanyak tiga kali. Hasil penelitian menunjukkan bahwa rasio C/N sebesar 20,36 dengan suhu rata-rata 25,1oC dan pH rata-rata 6. Nilai BOD awal dan akhir masing-masing sejumlah 77800,86 mg/l dan 53002,42 mg/l dan COD awal dan akhir masing-masing sejumlah 59800 mg/l dan 36000 mg/l. TS dan VS masing masing mengalami penurunan sebesar 20,99% dan 17,93%. Penggunaan adsorben arang aktif dan zeolit dapat meningkatkan kandungan gas CH4 sebesar 136,5% dan menurunkan kandungan gas CO2 sebesar 64% pada biogas. Lama waktu pengujian mampu meningkatkan konsentrasi CH4 dan menurunkan kandungan gas CO2 dengan waktu paling optimal yaitu 30 menit.Increasing Quality Of Biogas With Purification Proses On Double Arranged Series Purifier Using Activated Charcoal And Zeolit AdsorbentAbstract. The quality of biogas is determined by the methane (CH4) content in the biogas. A good biogas is indicated by its high methane content. One way to increase the methane gas content in biogas is by purification using a series-level purifier that has been filled with adsorbents. In this study, the adsorbents used were activated charcoal and zeolite. The variables measured include CN ratio, pH, temperature, total solid (TS), volatile solid (VS), Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) which influential in methane gas production. CH4 and CO2 levels, before and after purification. Biogas was purified for a duration of 30, 60, 90 minutes and was repeated three times. The results showed that the C/N ratio was 20.36 with an average temperature of 25.1 °C and an average pH of 6. The initial and final BOD values were 77800.86 mg/l and 53002.42 mg/l and the initial and final COD values were 59800 mg/l and 36000 mg/l. TS and VS experienced a decrease of 20.99% and 17.93%. The use of activated charcoal and zeolite adsorbents was able to increase the CH4 gas content by 136.5% and reduce the CO2 gas content by 64%. The optimal purification time is 30 minutes.

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