Question

why is treatment of sludge major problem​

Answer 1

hlo mate here is your answer.

Treatment and disposal of sewage sludge are major factors in the design and operation of all wastewater treatment plants. Two basic goals of treating sludge before final disposal are to reduce its volume and to stabilize the organic materials.Smaller sludge volume reduces the costs of pumping and storage.

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Answer 2

Because it contains harmful polymers and fatal germs.