| Title |
A Study on the Improvement of Sludge Dewatering and Dewatering Efficiency by Using Oyster Shell |
| Authors |
엄한기 ( Han Ki Eom ) ; 이진헌 ( Jin Heon Lee ) ; 주현종 ( Hyun Jong Joo ) |
| DOI |
https://doi.org/10.15681/KSWE.2016.32.5.458 |
| Keywords |
Dewatering; Filter Press; Moisture content; Oyster shell; Recycling |
| Abstract |
This study evaluated the dewatering efficiency of inorganic dehydrating agents that contain oyster shells. A filter press dehydrator was used for this study. The experiments were performed by the single injection of calcium-based chemicals, the single injection of oyster shells, and the mixed injection of oyster shells and calcium-based chemicals. The moisture content of the dewatered cake generated after dehydration confirmed that the best dewatering efficiency was found at the mixing ratios of CaCO3 to sludge, oyster shell to sludge, and inorganic dehydrating agent to sludge of 3:1, 10:1, and 1.5:2.5:1, respectively. The moisture contents exhibited less than 58% when the injection mixing ratio of inorganic dehydrating agent to sludge was 1.5:2.5:1. From EPS, SEM, and EDX analysis, it was found that the calcium adsorbed on the sludge surface could reduce extracellular polymeric substances (EPSs) and enhanced the dewaterbility. Based on the above results, it is considered possible to apply inorganic dehydrating agents containing recycled oyster shells in sludge dewatering in order to reduce sludge. |