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DOI : ,    Vol.11, No.1, 33 ~ 46, 2003
Title
An Experimental Study on Post-Denitification BNR Process Using Applying Fermentation Product of Wasted S1udge
이동성 Dong Sung Lee , 남덕현 Duck Hyun Nam , 박철휘 Chul Hui Park
Abstract
In case of small STP in Korea, producted sludge is stayed for some days to treat with other STP sludge or to be thickened for dehydration to landfill. Inflow is low-loading and some of primary sludge from in STP process became wasted sludge which is changed characteristics from fresh primary sludge during stored. Wasted sludge has produced lots of quantity at small unit STPs. Then, this study would like to evaluate for its carbon source value through fermentation and to experiment general sludge s changable characteristics from fresh primary sludge to wasted sludge. Practical carbon source value and denitrification rate of fermentation product and VFA using wasted sludge were studied with advanced sewer treatment process, BNR. According to experimental conclusion. denitrification rate was 3.52 ㎎N/gMLVSS . h that was similar value to endogenous denitrification and treatment efficiencies at BNR are BOD5 82.2%, CODcr 73.3%, SS 81.2%. and TN. TP appeared 43.8%, 69.57%, respectively. Post-denitrification was more economic than pre-denitrification because it didn`t require internal return sludge. And the point what is easier operating was considered post-denitrification s benefit, too. Post-denitrification could be expected similar or better treatment performance, if carbon source injection was enough. Variation of VSS/TSS ratio each days for using fresh primary sludge was changed from 71.2% and 58.6% after 7 days. This data was 17.7% VSS/TSS decrease that showedconsumption of VSS substrate as time went by. Important thing is that these decreasing characteristic was became visible constant slope after 4 days. If these trend continue, fresh primary sludge will convert wasted sludge and expect that it is useless state as fermentations` substrated.
Key Words
Wasted sludge, Primary sludge, Fermentation, Post-denitrification, VFA, Denitrification rate
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