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Resource treatment method for urban sludge

A technology for municipal sludge and treatment methods, which is applied in sludge treatment, water/sludge/sewage treatment, dewatering/drying/concentrated sludge treatment, etc. Disposal and other problems, to achieve the effect of easy incineration disposal, enhanced degradability, and improved combustion value

Inactive Publication Date: 2011-10-26
安徽雷克环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1) The sea disposal method has been abandoned;
[0005] 2) The proportion of landfill disposal has been greatly reduced;

Method used

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  • Resource treatment method for urban sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 1 kg of urban sludge (combustion value about 3200 J / g) that has been filtered through a filter press to a water content of about 80%, put it into an ultrasonic instrument with a capacity of 2 L, and perform ultrasonic treatment at a frequency of 900-950MHz After 50 minutes, transfer it to the extruder and heat it after airtight. When the internal gas temperature reaches about 150 ℃ and the pressure reaches about 3 atm, quickly open the extruder cover. After cooling to room temperature, take out the sludge and measure the water content as 23%, combustion value 5500J / g, pathogenic bacteria, parasites and other harmful microorganisms are basically completely inactivated after ultrasonication and puffing; and the content of exchangeable copper (Cu) and zinc (Zn) drops to about 30% of the original, The content of exchangeable lead (Pb) and cadmium (Cd) in the sludge after expansion and combustion is close to trace, and the detection results are shown in Table 1.

Embodiment 2

[0027] Weigh 1 kg of urban sludge filtered through a filter press to a water content of about 80%, add 20% of the sludge mass of sodium bicarbonate leavening agent and mix evenly, and put it into a 2 L capacity ultrasonic instrument. Ultrasonic treatment at a frequency of 900-950MHz for 30 minutes, then transferred to the extruder, sealed and then heated, when the internal gas temperature reached about 150 ℃ and the pressure reached about 3 atm, quickly opened the cover of the extruder, and cooled to room temperature , just take out the sludge, and the test results are shown in Table 1.

Embodiment 3

[0029] Weigh 3 kg of urban sludge filtered through a filter press to a water content of about 80% and put it into a 6 L ultrasonic instrument, ultrasonically treat it at a frequency of 915 MHz for 50 minutes, and then transfer it to an extruder. Heat it after airtight, and when the internal gas temperature reaches about 140 °C and the pressure reaches about 4 atm, quickly open the cover of the extruder, and take out the sludge after cooling to room temperature. The test results are shown in Table 1.

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Abstract

The present invention discloses a resource treatment method for urban sludge, which comprises the following steps of: ultrasonically treating the urban sludge, transferring to an expander, sealing, heating until the internal gas temperature reaches 120-160 DEG C and the pressure reaches 2-5 atm, opening the extruder cover, cooling to room temperature and taking out the sludge. The resource treatment method achieves the volume reduction and dewatering of the urban sludge, improves the combustion value of the sludge, simultaneously reduces the secondary pollution of heavy metals, pathogens and other harmful substances in the urban sludge, and achieves volume reduction, harmlessness and resource treatment of the urban sludge.

Description

technical field [0001] The invention relates to the field of environmental protection disposal of municipal sludge, in particular to a volume reduction, harmless and resourceful treatment method of municipal sludge. Background technique [0002] my country's urban sewage treatment plants produce about 30 million tons of sludge with a water content of 80% every year, and it is growing at a rate of 10%. At present, most of the sludge has not been properly disposed of, and the phenomenon of random discarding and dumping is widespread, which even offsets the achievements of pollution reduction to a certain extent. Due to high water content, large volume, easy corruption and high treatment cost, sludge accounts for about 40%-60% of the operating cost of the entire sewage process. Sludge is difficult to treat, largely due to its high water content and difficult dehydration characteristic. Sludge contains a large amount of organic matter, nitrogen, phosphorus and other eutrophi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14
Inventor 任冲蔡冬清唐义余增亮杨媛媛
Owner 安徽雷克环境科技有限公司
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