The study on the Production of Lightweight Ceramsite from the Yellow River Silt and its Performance Investigation

摘要

This study discussed the possibility and factors of employing the Yellow River Silt (YRS) as the starting materials to produce lightweight ceramisite (LWC) by a non-sintering process. Cement and sodium silicate were used as additives. The performance was evaluated though hospital wastewater degradation in a biological aerated reactor (BAF). Results presented that: (1) YRS could be used to prepare the LWC under the propitious condition (the ratio of YRS to cement was 75:25, the percentage of sodium silicate was 7% and the curing time was 5 d); (2) LWC could be used as a packing medium in the BAF. The BAF has large removal efficiencies on COD_(cr) and NH_3-N when the hydraulic retention time (HRT) and the ratio of air to liquid (A/L) were 6 h and 5:1 respectively.