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http://dx.doi.org/10.4491/KSEE.2015.37.10.583

Anaerobic Treatment of Leachate Solubilized from Thermal Hydrolysis of Sludge Cake  

Kang, Ho (Department of Environmental Engineering, Chungnam National University)
Oh, Baik-Yong (Department of Environmental Engineering, Chungnam National University)
Shin, Kyung-Sook (Environmental Research Institute, Hanwha E&C)
Publication Information
Journal of Korean Society of Environmental Engineers / v.37, no.10, 2015 , pp. 583-589 More about this Journal
Abstract
This study was performed to evaluate the feasibility of anaerobic pretreatment for the leachate solubilized from thermal hydrolysis of sewage sludge cake. Overall process for the treatment of sludge cake consists of thermal hydrolysis, crystallization of magnesium, ammonium, and phosphate (MAP) for the leachate and anaerobic digestion of supernatant from MAP crystallization. The experimental evidence showed that the optimum ratio of Mg : P for the struvite crystallization of leachate solubilized from thermal hydrolysis of sludge cake was 1.5 to 1.0 as weight basis at the pH of 9.5. With this operational condition, the removal efficiencies of ammonia nitrogen and phosphorous achieved 50% and 97%, respectively. The mesophilic batch test showed that the ultimate biodegradability of the supernatant from MAP crystallization reached 63% at S/I ratio of 0.5. The readily biodegradable fraction of 90% ($S_1$) of the MAP supernatant BVS (Biodegradable Volatile Solids, $S_0$) degraded with $k_1$ of $0.207day^{-1}$ for the initial 17 days where as the rest slowly biodegradable fraction ($S_2$) of 10% of BVS degraded with $k_2$ of $0.02day^{-1}$ for the rest of the operational period. Semi-Continuously Fed and Mixed Reactor (SCFMR) was chosen as one of the best candidates to treat the MAP supernatant because of its total solids content over 6%. Maximum average biogas production rates reached 0.45 v/v-d and TVS removal efficiency of 37~41% was achieved at an hydraulic retention time (HRT) of 20 days and its corresponding organic loading rate (OLR) of 1.43 g VS/L-d.
Keywords
Thermal Hydrolysis; Sewage Sludge Cake; Ultimate Biodegradability; MAP Crystallization; Anaerobic Digestion;
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