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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