How to clean this river?

1. On-site treatment: the sediment is directly covered or drained to the water without dredging, and then dehydrated, solidified or physically leached after being covered with water.

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2. Resource utilization: Sludge belongs to engineering waste. According to the principles of reduction, harmlessness and resource utilization of solid waste treatment, sludge is heated and sintered to be converted into building materials.

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3. Passivation treatment: According to the different active states of heavy metals in sludge in different environments, corresponding chemicals are added to transform unstable heavy metals in sludge into stable heavy metals, thus reducing the activity and pollution of heavy metals.

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4. Disposal of sludge in the yard: From the initial stage of hydraulic reclamation, sludge can be rapidly settled and consolidated, and combined with surface treatment technology, sludge yard can be recycled or quickly recovered.