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Preliminary studies on continuous chromium(VI) biological removal from wastewater by anaerobic-aerobic activated sludge process [An article from: Bioresource Technology]
Book Details
Author(s)Y. Chen, G. Gu
PublisherElsevier
ISBN / ASINB000RR5SZS
ISBN-13978B000RR5SZ7
AvailabilityAvailable for download now
Sales Rank99,999,999
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Bioresource Technology, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The long-term continuous chromium(VI) removal from synthetic wastewater affected by influent hexavalent chromium (Cr(VI)) and glucose concentrations were studied with an anaerobic-aerobic activated sludge process. It was observed that before activated sludge was acclimated, the chromium in the effluent increased immediately as the influent chromium increased. However, both Cr(VI) and total chromium (TCr) in the effluent significantly decreased after acclimation. In the acclimated activated sludge, the chromium removal efficiency was 100% Cr(VI) and 98.56% TCr at influent Cr(VI) levels of 20mg/day, 100% Cr(VI) and 98.92% TCr at influent Cr(VI) levels of 40mg/day, and 98.64% Cr(VI) and 97.16% TCr at influent Cr(VI) levels of 60mg/day. The corresponding effluent Cr(VI) and TCr concentrations were 0 and 0.012mg/l, 0 and 0.018mg/l, and 0.034mg/l and 0.071mg/l, respectively. When the influent glucose increased from 1125 to 1500mg/l at influent Cr(VI) dosage of 60mg/day, the Cr(VI) and TCr removal efficiency with the acclimated activated sludge improved from 98.64% and 97.16% to 100% and 98.48%, respectively, and the chromium concentration in the effluent decreased from 0.034mg/l of Cr(VI) and 0.071mg/l of TCr to 0 (Cr(VI)) and 0.038mg/l (TCr). The effluent COD and turbidity was around 40mg/l and 0, respectively, after the activated sludge was acclimated. Further studies showed that after the activated sludge was acclimated, its specific dehydrogenases activity (SDA) and protein contents increased. The SDA and protein increased respectively 15% and 10% when influent Cr(VI) increased from 20 to 60mg/day.
Description:
The long-term continuous chromium(VI) removal from synthetic wastewater affected by influent hexavalent chromium (Cr(VI)) and glucose concentrations were studied with an anaerobic-aerobic activated sludge process. It was observed that before activated sludge was acclimated, the chromium in the effluent increased immediately as the influent chromium increased. However, both Cr(VI) and total chromium (TCr) in the effluent significantly decreased after acclimation. In the acclimated activated sludge, the chromium removal efficiency was 100% Cr(VI) and 98.56% TCr at influent Cr(VI) levels of 20mg/day, 100% Cr(VI) and 98.92% TCr at influent Cr(VI) levels of 40mg/day, and 98.64% Cr(VI) and 97.16% TCr at influent Cr(VI) levels of 60mg/day. The corresponding effluent Cr(VI) and TCr concentrations were 0 and 0.012mg/l, 0 and 0.018mg/l, and 0.034mg/l and 0.071mg/l, respectively. When the influent glucose increased from 1125 to 1500mg/l at influent Cr(VI) dosage of 60mg/day, the Cr(VI) and TCr removal efficiency with the acclimated activated sludge improved from 98.64% and 97.16% to 100% and 98.48%, respectively, and the chromium concentration in the effluent decreased from 0.034mg/l of Cr(VI) and 0.071mg/l of TCr to 0 (Cr(VI)) and 0.038mg/l (TCr). The effluent COD and turbidity was around 40mg/l and 0, respectively, after the activated sludge was acclimated. Further studies showed that after the activated sludge was acclimated, its specific dehydrogenases activity (SDA) and protein contents increased. The SDA and protein increased respectively 15% and 10% when influent Cr(VI) increased from 20 to 60mg/day.
