A new product, rotational flow-limiting valve installed in combinedsewage intercepting chamber was introduced.
介绍了设置于合流制截流井中的一种新产品——旋流限流阀。
2
Treating combinedsewage effluent from a secondary treatment plant, the process achieved 94.5% cadmium removal for the trace quantities present .
用这种方法处理二级处理厂排出的综合下水，可除去水中含镉量的94.5。
3
Adequate supplies of safe-drinking water and proper disposal of sewage within communities, combined with personal hygiene practices, such as regular hand-washing, reduce the spread of HAV.