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Modeling and Optimization of High Strength Wastewater Treatment Using the Electro Oxidation Process

MetadataDetails
Publication Date2016-06-01
JournalKorean Chemical Engineering Research
AuthorsHong-Min Lee, Sangsun Lee, Sungwon Hwang, Dongbok Jin
Citations1

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์ •์œ ์‚ฐ์—…์˜ ์œ ์ง€ ๋ฐ ๋ณด์ˆ˜๊ธฐ๊ฐ„์— ๋ฐฐ์ถœ๋˜๋Š” ๊ณ ๋†๋„ํ์ˆ˜์˜ COD (Chemical Oxygen Demand)๋ฅผ ํšจ๊ณผ์ ์œผ๋กœ ์ œ๊ฑฐํ•˜๊ธฐ ์œ„ํ•ด ์ „๊ธฐ์‚ฐํ™”๊ณต๋ฒ•์„ ์ ์šฉํ•˜์˜€๋‹ค. ์šฐ์„  ์‚ฐ์—…์—์„œ ๋ฐฐ์ถœ๋˜๋Š” ์‹ค์ œ ํ์ˆ˜๋ฅผ ์ฒ˜๋ฆฌํ•˜๊ธฐ ์œ„ํ•˜์—ฌ BDD์ „๊ทน์„ ๊ฐœ๋ฐœํ•˜๊ณ , ๊ฐœ๋ฐœ๋œ ์ „๊ทน์„ ์ด์šฉํ•˜์—ฌ ์ „๋ฅ˜๋ฐ€๋„, pH, ์ „ํ•ด์งˆ๋†๋„, ๋ฐ˜์‘์‹œ๊ฐ„ ๋“ฑ๊ณผ ๊ฐ™์€ ๋‹ค์–‘ํ•œ ์šด์ „์กฐ๊ฑดํ•˜์— ์‹คํ—˜์„ ์ง„ํ–‰ํ•˜์˜€๋‹ค. ๋‘˜์งธ, ์ด๋Ÿฌํ•œ ์‹คํ—˜๊ฒฐ๊ณผ๋ฅผ ์ด์šฉํ•˜์—ฌ ์ „๊ธฐ๋ถ„ํ•ด์˜ kinetic parameter๋ฅผ ์‚ฐ์ถœํ•œ ํ›„์—, ์ด๋ฅผ ํ† ๋Œ€๋กœ ์ „๊ธฐ์‚ฐํ™” ์ฒ˜๋ฆฌ์„ค๋น„๋ฅผ ์ˆ˜ํ•™์ ์œผ๋กœ ๋ชจ๋ธ๋ง ํ•˜์˜€๋‹ค. ๋งˆ์ง€๋ง‰์œผ๋กœ, ๊ธฐ์กด์— ์ •์ƒ์šด์ „ ์กฐ๊ฑด ์‹œ ์‚ฌ์šฉํ•˜๋˜ ์ € ๋†๋„ ํ์ˆ˜๋ฅผ ์ฒ˜๋ฆฌํ•˜๋Š” ๊ณต์ •์˜ ์œ ์ž…์กฐ๊ฑด์— ๋งž์ถ”๊ธฐ ์œ„ํ•˜์—ฌ ์ „๊ธฐ์‚ฐํ™” ์ฒ˜๋ฆฌ์„ค๋น„์˜ ์„ค๊ณ„ ๋ฐ ์šด์ „์˜ ๋‹ค์–‘ํ•œ ๋ณ€์ˆ˜๋“ค์„ ์ตœ์ ํ™”ํ•จ์œผ๋กœ์จ ๋ณด๋‹ค ํšจ์œจ์ ์ธ ํ์ˆ˜ ์ „์ฒ˜๋ฆฌ ์‹œ์Šคํ…œ์„ ๊ฐœ๋ฐœํ•˜์˜€๋‹ค. ๋ณธ ์—ฐ๊ตฌ๋ฅผ ํ†ตํ•ด ๊ฐœ๋ฐœ๋œ ๋ชจ๋ธ์˜ ๊ฒฐ์ •๊ณ„์ˆ˜(<TEX>$R^2$</TEX>)๋Š” 0.982๋กœ ์ƒ๋‹นํžˆ ์ž‘์€ ์˜ค์ฐจ๋ฒ”์œ„๋ฅผ ๋ณด์—ฌ์คŒ์œผ๋กœ์จ ๋ชจ๋ธ์˜ ๋†’์€ ์ •ํ™•๋„๋ฅผ ์ž…์ฆํ•˜์˜€๋‹ค. Electro oxidation system was designed in this study for the reduction of COD (Chemical Oxygen Demand) from high-strength wastewater, produced during refinery turnaround period. First, BDD (Boron Doped Diamond) electrode was synthesized and electro oxidation system of actual industrial wastewater was developed by adopting the synthesized BDD electrode. The experiments were carried out under various operating conditions under certain range of current density, pH, electrolyte concentration and reaction time. Secondly, reaction kinetics were identified based on the experimental results, and the kinetics were embedded into a genetic mathematical model of the electro oxidation system. Lastly, design and operating parameters of the process were optimized to maximize the efficiency of the pretreatment system. The coefficient of determination (<TEX>$R^2$</TEX>) of the model was found to be 0.982, and it proved high accuracy of the model compared with experimental results.