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Artificially intensified preanhydration method for sludge

A kind of sludge and artificial technology, applied in the direction of dehydration/drying/concentrated sludge treatment, energy wastewater treatment, etc., can solve the problems of long cycle, generation of a large amount of malodorous gas, and influence on the surrounding environment, so as to improve the air permeability and increase the air permeability and evaporation area, the effect of reducing mechanical energy consumption

Active Publication Date: 2010-10-13
NAT ENG RES CENT OF URBAN WATER RESOURCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that in the existing sludge pre-drying method, the natural drying and dehydration generally takes a long period, requiring a week or several weeks, and because the sludge is in an anaerobic state, natural drying will produce a large amount of malodorous gas , affecting the surrounding environment

Method used

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  • Artificially intensified preanhydration method for sludge
  • Artificially intensified preanhydration method for sludge
  • Artificially intensified preanhydration method for sludge

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specific Embodiment approach 1

[0009] Specific implementation mode one: (see figure 1 ) The technical scheme of this embodiment is realized by the following steps: one, on the hard cement ground or on the ground where the waterproof layer is laid, build a sun-drying shed with a waveform light-transmitting and rain-proof ceiling 2 on the top; two, after the dehydration of the sewage treatment plant The sludge (with a moisture content of about 80%) is mixed with a conditioner, the volume ratio of the sludge to the conditioner is 1:0.3~2, and the conditioner is one or more of pumice, vermiculite, perlite, zeolite or sand It is made of multiple compounds, and the particle size of the conditioning agent is (average diameter) 0.4-80mm. 3. Dry the mixed material obtained in step 2 on the hard cement floor or the ground where the waterproof layer is laid in step 1, and dry it on the ground Filling or gravel layers can also be set, and the drying site should be selected in a well-ventilated and sunny location. Vert...

specific Embodiment approach 2

[0010] Specific embodiment 2: In this embodiment, the mixing of sludge and conditioner is 1:1 by volume. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Specific implementation mode three: (see figure 2 ) The technical scheme of the present embodiment is realized by the following steps: one, build the top to be provided with the sun-drying awning of corrugated light-transmitting rain-proof ceiling 2, the bottom of the airing shed is the suspended bed bottom plate 5, and air can flow at the bottom of the bed, has increased air and The contact area of ​​the drying material, two, preparation conditioner, conditioner is one or more of pumice, vermiculite, perlite, zeolite or sand composition compounded in any proportion, the particle size of conditioner is (average diameter) 0.4 ~80mm, 3. After the sludge and conditioner are fully mixed at a volume ratio of 1:0.5~2, they are stacked on the suspended bed bottom 5 composed of perforated plates or stainless steel mesh, and the material stacking height is 0.3~0.7m. The hole diameter of the bottom plate should be able to stop the mixture of conditioner and sludge from falling. ...

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Abstract

The invention relates to an artificially-enhanced pre-drying method of sludge, which belongs to a pre-drying method of sludge and aims to solve the problems of the prior art, such as long period of natural sun-drying dehydration, large climate influence, generation of a large amount of foul gases during the natural sun-drying, environmental pollution, large consumption of conditioning agent, large size of the after-end fermentation device and high running cost of the aerobic composting process. The technical proposal is as follows: the mixed materials are turned and composted once per 6 to 24hour and are dried in the sun for 3 days to 5 days until the water content of the sludge is in the range from 75% to 70%. Alternatively, the technical proposal is as follows: the sludge and the conditioning agent are mixed in a volume ratio of 1:(0.5-2), and the mixture is composted on a suspended bed base plate at a compost height in the range from 0.3m to 0.7m. The method ensures the pre-dryingperiod in the range from 3 days to 5 days, works without needing external heat sources, promotes the air circulation flow based on the difference in temperature and pressure between the upper part and the lower part of the base plate, and reduces the mechanical energy consumption of the blower fan.

Description

technical field [0001] The invention relates to a method for pre-drying sludge. Background technique [0002] In order to solve the increasingly prominent water pollution problem in our country, a large number of sewage treatment plants have been built all over the country. With the operation of these enterprises, a large amount of sludge is produced in the process of sewage treatment. Due to the high content of organic matter, large water content, long degradation cycle, easy corruption, strong odor, leachate can easily pollute groundwater and breed mosquitoes, sludge becomes solid waste that affects the environment and must be given reasonable final disposal. At present, the final disposal methods of sludge include incineration, sanitary landfill, composting, etc. Among them, aerobic composting has been paid more and more attention because it can simultaneously realize the reduction, stabilization, harmlessness and resource utilization of sludge. The moisture content of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12
CPCY02W10/37
Inventor 李伟光王科王璐璐邹锦林王广智
Owner NAT ENG RES CENT OF URBAN WATER RESOURCE
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