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A biological and chemical coupling sludge conditioning method

A sludge conditioning and sludge mixing technology, which is applied in the field of environmental engineering, can solve the problems of high cost, poor sludge dehydration effect, long cycle, etc., achieve long biological reaction cycle, improve coagulation and adsorption efficiency, and dosing A large amount of effect

Active Publication Date: 2018-07-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of poor sludge deep dehydration effect, high cost and long cycle under low temperature conditions in the existing municipal sludge treatment process, and to provide a biological and chemical coupling sludge conditioning method

Method used

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  • A biological and chemical coupling sludge conditioning method

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specific Embodiment approach 1

[0019] Specific implementation mode one: combine figure 1 Description of this embodiment, the biological and chemical coupling sludge conditioning method of this embodiment is carried out according to the following steps:

[0020] 1. The material to be treated enters the contact zone 1 through the feed pipe 13, and the mixed sludge in the fifth reaction zone 5 enters the contact zone 1 through the sludge return pump 12 and the sludge return pipe 16, and at the same time, the mixed sludge in the stirring tank 8 of the agent A The mixed solution of agent A enters the contact zone 1 through the agent A dosing pipe 14, and the mixed solution of the material to be treated, the return sludge and the agent A forms mixed sludge under the action of air agitation in the contact zone 1, and the mixed sludge enters from the bottom of the partition The second reaction zone 2 then bypasses the baffle plate 19 and enters the third reaction zone 3, the fourth reaction zone 4 and the fifth rea...

specific Embodiment approach 2

[0024] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that step 1 medicament A: every kg consists of 50-300g nanometer sulfur powder, 200-400g ferrous sulfate, 100-200g ferric chloride, 100-1000mg vitamin A, 1-5g zinc chloride, 5-50g potassium dihydrogen phosphate, 50-150g thermally modified diatomite, 5-50g glucose, 5-50g animal glue and 2-50g surfactant. Other steps and parameters are the same as those in Embodiment 1.

[0025] In this embodiment, the heat-modified diatomite is to heat the diatomite at 200° C.-500° C. for 1-5 hours.

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment is different from Embodiment 2 in that the surfactant is one or any combination of stearic acid, quaternary ammonium salt, and polysorbate. Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention discloses a biology and chemistry coupled sludge conditioning method and belongs to the technical field of environment engineering. The invention aims to solve the problem that the conventional municipal sludge processing technology has the disadvantages of bad dehydration effect, high cost, and long period under a low temperature condition. The method comprises the following steps: mixing processed materials, returned sludge, and a mixed solution of medicament A in a contact area, carrying out reactions in a reaction area; returning part of mixed sludge to the contact area, mixing the other part of mixed sludge with a mixed solution of medicament B in next reaction area, and carrying out biochemical reactions. Two-point medicament addition technology is adopted, the addition amount of medicament is little, and the cost is low. The efficiency of biological reactions is high. The reaction period of biological acidification required by bioleaching is shortened by 25% or more. The sludge dehydration effect under a low temperature condition is improved. The water content of sludge is less than 60% after deep hydration at a temperature less than 10 DEG C and the sludge conditioning time is shorter than 36 hours. The provided method is beneficial for the subsequent recycling of dehydrated sludge and the treatment of press-filtered acidic liquid.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a biological and chemical coupled sludge conditioning method. Background technique [0002] Municipal sludge is mainly the residual sludge discharged from the secondary biochemical treatment of the sewage treatment plant or the mixed sludge mixed with the primary sedimentation tank. It has high organic matter content and strong hydrophilicity, resulting in a high moisture content of dewatered sludge. As high as 80%-85%, deep dehydration requires a large amount of ferric chloride, calcium oxide and other chemicals. Not only the price is high, the quality of solid waste is increased, but also the subsequent resource utilization of organic solid waste is seriously affected; The sludge temperature is mostly below 15 degrees Celsius, and the complete mixed bioleaching process is used for sludge conditioning, which has a long biological treatment cycle tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/14
CPCC02F11/04C02F11/14C02F2103/001
Inventor 王科
Owner HARBIN INST OF TECH
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