教師資料查詢 | 類別: 期刊論文 | 教師: 李柏青PO-CHING LEE (瀏覽個人網頁)

標題:Effect of temperature, hydraulic residence time and elevated PCO2 on acid neutralization within a pulsed limestone bed reactor
學年95
學期2
出版(發表)日期2007/03/01
作品名稱Effect of temperature, hydraulic residence time and elevated PCO2 on acid neutralization within a pulsed limestone bed reactor
作品名稱(其他語言)
著者Watten, Barnaby J.; Lee, Po-ching; Sibrella, Philip L.; Timmons, Michael B.
單位淡江大學水資源及環境工程學系
出版者London:International Water Association Publishing
著錄名稱、卷期、頁數Water Research 41(6), pp.1207-1214
摘要Limestone has potential for reducing reagent costs and sludge volume associated with treatment of acid mine drainage, but its use is restricted by slow dissolution rates and the deposition of Fe, Al and Mn-based hydrolysis products on reactive surfaces. We evaluated a pulsed limestone bed (PLB) reactor (15 L/min capacity) that uses a CO2 pretreatment step to accelerate dissolution and hydraulic shearing forces provided by intermittent fluidization to abrade and carry away surface scales. We established the effects of hydraulic residence time (HRT, 5.1–15.9 min), temperature (T , 12–22 °C) and CO2 tension (PCO2PCO2, 34.5–206.8 kPa) on effluent quality when inlet acidity (Acy) was fixed at 440 mg/L (pH=2.48) with H2SO4. The PLB reactor neutralized all H+ acidity (N =80) while concurrently providing unusually high levels of effluent alkalinity (247–1028 mg/L as CaCO3) that allow for side-stream treatment with blending. Alkalinity (Alk) yields rose with increases in PCO2PCO2, HRT and settled bed height (BH, cm) and decreased with T following the relationship (R 2=0.926; p <0.001): (Alk)non-filtered=−548.726+33.571·(PCO2PCO2)0.5+33.671·(HRT)+7.734·(BH)−5.197·(T). Numerical modeling showed CO2 feed requirements for a target Alk yield decrease with increases in HRT, T and the efficiency of off-gas (CO2) recycling.
關鍵字Acid mine drainage; Limestone dissolution; Carbon dioxide; Hydraulic residence time; Temperature; Pulsed bed reactors
語言英文
ISSN0043-1354;1879-2448
期刊性質國外
收錄於SCI
產學合作
通訊作者Watten, Barnaby J.
審稿制度
國別
公開徵稿
出版型式紙本;電子版
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