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Steam hot leaching method for sludge treatment

A technology of sludge and heat soaking, which is applied in the direction of pyrolysis sludge treatment, dehydration/drying/concentrated sludge treatment, etc. It can solve the problems of high technical energy consumption and complicated process, and achieve simple reprocessing, simple equipment and economical The effect of energy consumption

Active Publication Date: 2016-03-16
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems of high energy consumption and complex process of the existing sludge treatment technology, the present invention proposes a method of using steam thermal degradation to treat sludge, and at the same time can extract the organic matter in the sludge, that is, use steam to destroy the sludge cell structure and dissolve the organic matter And transfer most of them to the liquid phase product (leach solution), so as to achieve the purpose of sludge reduction and resource reuse

Method used

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  • Steam hot leaching method for sludge treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The sludge extraction reactor 2 is equipped with a material frame 3 containing sludge. The upper end of the material frame is open, and the periphery and bottom are 200 mesh ceramic filters. The material frame is hung in the reactor 2, and the material frame is Put 2.5kg of sludge to be treated. The water content of the sludge to be treated is 81.4%, and the dried solid TOC is 217mg / g. It is placed in the material frame 3, the reactor 2 is sealed, and the gauge pressure is evacuated to -0.07MPa.

[0030] The processing flow is as figure 1 As shown, 1.2kg of 200℃ steam is introduced into the reactor 2 from the steam distributor 1 on the upper part of the reactor, and the temperature in the reactor is maintained at 150℃ for 20 hours; the leaching liquid produced during the steam heating and leaching process and The condensed water is collected in the kettle liquid collector 4 at the bottom of the reactor 2.

[0031] After the extraction is completed, it is naturally cooled t...

Embodiment 2

[0034] The sludge leaching reactor 2 is equipped with a material frame 3 containing sludge. The upper end of the material frame is open, and the surrounding and bottom are 300 mesh stainless steel filters. The material frame support is placed in the reactor 2 inside the material frame There are 8 tons of sludge to be processed. The moisture content of the sludge to be treated is 80.8%, the dried solid TOC (total organic carbon) is 214mg / g, the reactor 2 is sealed, and the gauge pressure is evacuated to -0.06MPa.

[0035] Pass 3 tons of 600℃ steam from the steam distributor 1 on the upper part of the reactor into the reactor 2, and keep the temperature in the reactor at 300℃ for 5 hours; the leachate and condensate produced during the steam heating and extraction process Collect at the bottom of reactor 2 to become kettle liquid.

[0036] After the extraction is completed, it is naturally cooled to room temperature, and the kettle liquid is discharged at a time; the residual sludge...

Embodiment 3

[0039] The same parts as in Example 2 will not be described again, and the difference is that there are two sets of sludge leaching reactors 2, which operate alternately. First, after the leaching of the first reactor is complete, the exhaust steam in it is released into the second reactor to be heated 2; after the pressure is released, 1.5 tons of fresh steam at 300°C is continued to flow into the second reactor. In the two reaction kettles 2, there are 4.5 tons of sludge to be processed in the material frame. Keep the temperature in the kettle at 200°C for 10 hours.

[0040] Using two sets of devices for hot extraction can save steam consumption and lower the cost. For the first set of equipment operating alternately, before the reaction, the moisture content of the sludge to be treated was 82.3%, and the TOC value of the dry sludge was 221mg / g; after the treatment, the TOC of the sludge biscuit base was 61mg / g, which was the original sludge. 27.6% of mud TOC, BOD of easily bi...

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Abstract

The invention relates to a novel method for treating sludge through steam heat leaching, aims to realize reduction, reclamation and harmlessness of sludge, and belongs to the technical field of solid waste treatment. The novel method comprises the following steps: putting the sludge into a material basket, and putting into a sealed reaction kettle; vacuuming the reaction kettle, and introducing high-temperature steam; heating the sludge by using the steam so as to crush cells and dissolve organic matters; separating the leachate which is rich in organic matters from the sludge under the action of gravity, and gathering at the bottom of the reaction kettle. The sludge is always only in contact with the fresh steam, most organic matters in the sludge are leached into leach liquor and are degraded into micromolecule substances which are easy to treat in a biochemical manner. The leach liquor can be utilized as a liquid fertilizer, a soil improver, a denitrification carbon source of sewage treatment plants, and the like; the residual sludge is low in organic matter content, can be easily dehydrated or dried in air naturally, and is subsequently thoroughly treated for building materials, land recycling or backfilling.

Description

Technical field [0001] The invention relates to a method for treating sludge, in particular to a method for treating sludge by steam thermal extraction, and belongs to the technical field of solid waste treatment. Background technique [0002] In 2012, the sewage treatment facilities put into operation in my country processed 116 million cubic meters of sewage per day and produced nearly 100,000 tons of sludge per day (based on 80% moisture content). The sludge is rich in refractory organic matter, heavy metals, viruses, bacteria, etc., which makes it difficult to treat. Different from traditional technologies such as incineration and landfilling, thermal hydrolysis technology can significantly improve the dewatering performance and biodegradability of sludge. The products after treatment can be used as resources, and the sludge reduction can be realized at the same time. Harmless. [0003] Chinese patent 20041203414.2 discloses a method for treating surplus sludge, which is comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/10C02F11/12
Inventor 徐愿坚王光伟陈忠陈鸿珍殷逢俊杨舒
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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