Different chemical compounds from chemical and biological laboratories, a dry cleaning laundry, car services and a medical centre are discharged into sewers and simultaneously interfere with waste water from household activities, some of which may pass through a treatment plant and create an adverse impact. Some of these chemicals are toxic, others are known to produce toxic and carcinogenic products. It is recommended that their disposal in a municipal wastewater treatment plant is prevented by recycling these chemicals, establishing a special pretreatment programme or by separate disposal.
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