Sludge resource treatment method

Abstract

The invention discloses a sludge recycling treatment method. The method comprises the following steps that 1, concentrated sludge of a sewage treatment plant is collected and then enters a sludge dewatering system to be dewatered; 2, sludge obtained after dewatering is continuously sent to a sludge drying system for sludge drying, and gas generated by the sludge drying system in the drying processenters a condensing unit through a first discharge pipeline, then enters a tail gas purification system through a second discharge pipeline, and is discharged after purification of the tail gas purification system reaches the standard, wherein the condensing unit is provided with a sewage pipeline discharging condensate water; 3, dried sludge is continuously sent into a sludge dry distillation system to be subjected to pyrolysis under the condition of isolating air; 4, a solid product obtained through pyrolysis is continuously sent into a sludge gasification system, and finally slag is produced. According to the scheme, reduction, stabilization, detoxification and recycling of the sludge can be achieved.

Description

technical field [0001] The invention relates to a method for treating sludge as a resource, which is suitable for advanced treatment of the sludge, so as to realize the reduction, stabilization, harmlessness and resource utilization of the sludge. Background technique [0002] In recent years, my country's sewage treatment industry has achieved great development, which has greatly improved my country's water environment. However, the rapid increase of water treatment plants and sewage treatment volume has led to a sharp increase in the total amount of sewage sludge produced by sewage treatment plants in the process of sewage treatment, which has become a new threat source of environmental pollution in my country. [0003] According to statistics, the main methods of sewage sludge disposal in urban sewage treatment plants in my country are agricultural utilization, landfill, and other disposal (including incineration), and the investment in sludge treatment and disposal accou...

AI Technical Summary

Problems solved by technology

However, the use of sludge in agriculture will increase the concentration of heavy metals in the soil and indirectly enter the atmosphere and water environment, thereby threatening human health; sludge landfill will occupy a large amount of land resources and cause potential environmental hazards; and sludge incineration treatment Almost all kinds of harmful substances can be removed, but the incineration of sludge requires a large amount of heat source, and most of the heat has not been recycled, the cost is high, the investment is also large, and the incineration process is accompanied by serious air pollution

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