前排放阀 front drain valve
目前排放控制区 Emission Control Areas ; ECAS
实验时选用突触前排放 presynaptic volley
前排放塞 front drain plug
区的突触前排放 presynaptic volley
污水排放前应该进行更充分的处理。
There should be greater treatment of sewage before it is discharged.
该泥水回流到二级处理系统，以保证排放前的澄清度。
Sludge liquor is recirculated in the secondary system to assure its purity before discharge.
此外，随着工厂的生产扩建，未来的废水量大概会增长75%左右，因此需要在排放前处理到3级排放标准。
In addition, with the production site planned expansion, the future wastewater flow rate is predicted to increase by approx. 75 % which will need to be treated to class 3 standards before discharge.
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