septic tanks
化粪池
sewage disposal
污水处置
sewage treatment systems
污水处理系统
solid waste disposal
固体废物处置
waste assimilation capacities
废物同化处置
waste conversion techniques
废物转化技术
waste disposal
废物处置
waste disposal in the ground
废物土地处置
waste recovery
废物回收
waste use
废物利用
water reuse
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