Analysis of urban ditch sludge treatment and future development directions

  • Dec 19.
  • Administrator.
  • 45 visits
Sediments in urban drainage pipe networks can cause a series of operational and environmental problems such as pipe blockage, greenhouse gas emissions, pipe corrosion, odor and overflow pollution. In the context of carbon neutrality and sustainable development, more efficient and proactive managemen

Sediments in urban drainage pipe networks can cause a series of operational and environmental problems such as pipe blockage, greenhouse gas emissions, pipe corrosion, odor and overflow pollution. In the context of carbon neutrality and sustainable development, more efficient and proactive management measures for sediments in drainage pipe networks are needed to reduce various negative problems caused by them. At the same time, with the development of urbanization and the gradual expansion and improvement of urban pipe network systems, there is an urgent need to rationally dispose of more and more channel sludge cleaned from pipeline sediments.

撬装式管沟污泥处理设备

The properties of aqueous sludge in different cities vary greatly, and the properties of sludge are also affected by the type of pipe network and land use. The wet multi-stage separation treatment process has strong adaptability to changes in the properties of trench sludge, and can also take into account the resource utilization of sludge. In view of the concept of "water saving means pollution control" and the policy of giving priority to water saving, for water resource sensitive areas, a ditch sludge treatment process with full reuse of flushing water can be used. This process can achieve about 100% flushing water reuse, which is conducive to significantly reducing tail water emissions and improving the utilization rate of channel sludge resources. This process can take the form of a mobile trench sludge treatment station to solve the problem of scattered trench sludge treatment points.

The skid-mounted trench sludge treatment equipment developed and manufactured by Desen Environment can effectively separate sediment and debris by scrubbing, screening and classifying trench sludge to meet the requirement of reducing trench sludge. Chemical, harmless and resource-based treatment needs. The working principle of this equipment is to use hydraulic impact and friction to separate organic and inorganic substances in trench sludge. The specific process is as follows:

The sludge in the pipe trench (trough) is sent to the cylindrical scrubber through the conveyor belt. Under the action of high-pressure water flow, it is scrubbed and flushed vigorously to separate the organic matter from the inorganic matter.

The scrubbed materials are initially classified through a screening machine, and debris larger than 10mm (such as plastic bags, bottles, etc.) are separated from the materials and recycled or treated harmlessly.

After preliminary classification, the materials enter the washing and selection module and undergo secondary scrubbing and flushing on the rotating screen to separate organic matter (such as paper, leaves, etc.) smaller than 10mm from inorganic matter (such as sand and gravel, etc.) and Recycle or dispose of harmlessly.

After secondary scrubbing, the inorganic matter is graded and screened by fine sand to separate fine sand smaller than 0.5mm from coarse sand larger than 0.5mm, and then be recycled or treated harmlessly.

After fine sand classification and screening, the coarse sand is dehydrated through a dewatering screen and recycled or treated harmlessly.

The wastewater generated during the scrubbing and screening process passes through the solid-liquid separation and water treatment system to separate and remove suspended solids and dissolved solids in the water, and then recycle or treat them harmlessly.

The screened material separated by the trench sludge treatment process has good resource utilization potential, and the appropriate resource utilization technology can be selected according to the specific properties of the trench sludge. In the future, the development of trench sludge treatment technology should be directed towards greater carbon emission reduction and unattended Industry 4.0 to further improve the socio-economic benefits of the treatment process and reduce process operation and maintenance costs.

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