Technique for treating sewage sludge into soil

Abstract

The invention relates to a sludge treatment process, which discloses a sludge soil-oriented treatment process adopting a sludge soil-oriented pond for sludge treatment, a bottom layer of the sludge soil-oriented pond is a waterproof layer, an upper layer thereof is a filtering layer, the filtering layer includes a sand layer, a sandstone layer and an earthwork cloth layer, a humus soil layer is arranged on the filtering layer, reeds are planted on the humus soil layer, the filtering layer of the sludge soil-oriented pond is provided with a leachate collecting pipeline, and the sludge treatment process comprises the following steps of: discharging the sludge onto the humus soil layer of the sludge soil-oriented pond, stopping the discharge of sludge to the sludge soil-oriented pond after the sludge soil-oriented pond is saturated, and finishing the soil building after the sludge discharged into the sludge soil-oriented pond experiences the stabilization period. The process has advantages of simple process flow, easy management and operation, meanwhile realizing the sludge resource utilization.

Description

technical field [0001] The invention relates to a sludge treatment process. Background technique [0002] With the progress of urbanization and the improvement of environmental quality standards, the rate and degree of sewage treatment have been improved and deepened day by day, and the output of sludge has also greatly increased. In 2003, the annual output of sludge (dry weight) in the country was about 130×10 4 tons, and is increasing at a rate of more than 10% per year. At present, domestic and international sludge disposal methods include landfill, drying, incineration, land utilization, and building materials production, depending on various conditions. [0003] Sludge treatment mainly has the following problems: [0004] (1) The moisture content of the sludge is high [0005] The high water content of sludge is a remarkable feature of sludge, and its water content is 97% to 99%, which brings great difficulties to transportation, and poses a threat to the surroundin...

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Problems solved by technology

[0005] The high water content of sludge is a remarkable feature of sludge, and its water content is 97% to 99%, which brings great difficulties to transportation, and poses a threat to the surrounding environment of the transportation route, forming "sludge pollution". - Sludge treatment - Inadequate treatment - Affecting sludge disposal - Sludge secondary pollution" vicious circle situation

[0006] (2) Increased difficulty in sludge treatment

Due to the excessive discharge of a large amount of industrial wastewater, agricultural drainage and rainwater runoff and other non-point source pollution, the sludge composition has become increasingly complex, and there are a large number of artificially synthesized and difficult-to-biodegrade organic matter, heavy metals, pathogenic microorganisms, etc., which make sludge treatment more difficult.

If these sludges are not properly treated, they will inevitably cause secondary pollution to the environment, forming new public hazards, and making urban sewage treatment more effective.

[0007] (3) With the improvement of sewage treatment standards, new problems arise in sludge treatment

[0008] (4) There are deficiencies in various sludge disposal methods

For example, the incineration method can greatly reduce the volume, but the investment and operation costs are quite high, and it is difficult to use the incineration method to treat the sludge of large-scale and wide-ranging urban sewage treatment; the water body injection method has been increasingly strict in recent years to prevent marine pollution and international conventions; the landfill method is restricted due to the limited space and may cause secondary pollution; the agricultural use of sludge is also restricted due to the increasingly complex composition of sludge, and with the discharge standards of heavy metals in agricultural sludge As well as the improvement of sanitation requirements, the agricultural use of sludge is increasingly restricted

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