primary waste meaning in Chinese

初级废物；基本废物
基本废物

What appear to be the primary waste / emission sources for the neighborhood
社区中主要的废水排放源头看来是什么？
Innovative and space - saving water and wastewater treatment processes ; including hybrid biological reactor ; nucleated precipitation for heavy metals from industrial wastewater ; two - phase anaerobic system for sulfate - laden waste ; and primary waste treatment improvement by sludge recycling
创新的水与污水处理方法：混合生物反应器;淤泥回流提高废物处理效率；厌氧废水处理;重金属去除技术之研发。