What hazards to the environment caused by improper sludge disposal?

(1) Organic matter pollution: Organic pollutants in sludge mainly include benzene, chlorophenol, PCBs, PCDFs and PCDDs. The organic pollutants contained in the sludge are not easily degraded and have toxic residues for a long time. These toxic and harmful substances will cause environmental pollution when they enter the water and soil. (2) Pathogenic microbial pollution: pathogenic microorganisms and parasite eggs in the sewage will enter the sludge. The pollution ways of pathogens in the sludge to humans or animals include direct contact with the sludge, direct contact with the sludge through the food chain, and water source contaminated by pathogens, and the soil and then the water body polluted by the pathogens. (3) Heavy metal pollution: During the sewage treatment process, 70%~90% of

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