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How do earthworms help in sewage treatment?

Earthworms acts as bio-filter to remove total dissolved solids, total suspended solids  from wastewater by the general mechanism of ingestion and biodegradation of organic wastes, heavy metals, and solids from wastewater and also by their absorption through body walls. Earthworms increase the natural aeration by granulating the clay particles. They also grind the silt and sand particles which enhances the ability to adsorb the organic and inorganic material from the wastewater.

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Hey there! As answered previously:-

The process of treating the sewage before discharging it in the waterways is termed as sewage treatment. Sewage consists of excessive amount of nitrogen, phosphorus, metal compounds and organic matter. Microorganisms breaks down the chemical and biological waste present in the sewage, digesting the organic matter present in it. They feed on the organic matter and releases an enzyme which helps in its degradation removing the organic matter from the sewage. This results in conversion of complex matter into simpler substances to prevent the pollution of water bodies in which the treated sewage is discharged.

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The process of treating the sewage before discharging it in the waterways is termed as sewage treatment. Sewage consists of excessive amount of nitrogen, phosphorus, metal compounds and organic matter. Microorganisms breaks down the chemical and biological waste present in the sewage, digesting the organic matter present in it. They feed on the organic matter and releases an enzyme which helps in its degradation removing the organic matter from the sewage. This results in conversion of complex matter into simpler substances to prevent the pollution of water bodies in which the treated sewage is discharged.

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