A pretreatmenttank can also serve to store secondary sludge.
预处理池也可以用于储存二级污泥。
2
Pretreatmenttank construction can be of steel or concrete, depending upon cost, soil conditions, and regulatory agency requirements.
预处理池可以使钢质或水泥质，这取决于成本，土壤状况和相关管理机构的要求。
3
Operation of the system would be similar to that for the side-by-side configuration with the exception that wastewater would have to be pumped into the pretreatmenttank.