Abstract
This study discussed the possibility 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 of the LWC serving as a biomedium in a biological aerated reactor (BAF) for hospital wastewater treatment was investigated and the optimum operation condition was studied. 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 NH3-N when the hydraulic retention time (HRT), the ratio of air to liquid (A/L) and the height of packing medium were 6 h, 5:1 and 80 cm respectively.
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