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Method for regulating stable pH value of sludge alkali

An adjustment method and alkali-stabilized technology, which is applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of unsatisfactory passivation effect of heavy metal ions, low sludge ash ratio, and weak bactericidal ability To achieve the effect of facilitating subsequent processing and disposal, ensuring hygiene and safety, and accelerating stable curing

Inactive Publication Date: 2014-12-10
张文标
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing sludge alkali-stabilized pH adjustment methods generally have problems such as weak bactericidal ability, low ash ratio in sludge, and unsatisfactory passivation effect of heavy metal ions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The sludge alkali-stabilized pH value adjustment method comprises the following steps: putting the compound agent into the preliminarily dehydrated sludge, stirring and mixing the reaction; the compound agent is based on the amount of treated sludge, and is calculated by weight percentage.

[0029] CaO 6%.

[0030] MgSO 4 1%.

[0031] CaCl 2 1%.

[0032] NaCl 0.8%.

[0033] Sulfamic acid 0.3%.

Embodiment 2

[0035] The sludge alkali-stabilized pH value adjustment method comprises the following steps: putting the compound agent into the preliminarily dehydrated sludge, stirring and mixing the reaction; the compound agent is based on the amount of treated sludge, and is calculated by weight percentage.

[0036] CaO 7%.

[0037] MgSO 4 1%.

[0038] CaCl 2 0.8%.

[0039] NaCl 0.8%.

[0040] Sulfamic acid 0.2%.

Embodiment 3

[0042] The sludge alkali-stabilized pH value adjustment method comprises the following steps: putting the compound agent into the preliminarily dehydrated sludge, stirring and mixing the reaction; the compound agent is based on the amount of treated sludge, and is calculated by weight percentage.

[0043] CaO 7%.

[0044] MgSO 4 1.8%.

[0045] CaCl 2 1.5%.

[0046] NaCl 0.7%.

[0047] Sulfamic acid 0.2%.

[0048] The sulfamic acid in the compound agent is used as a pH regulator, and sodium chloride is used as a slow-release catalyst for the sulfamic acid to catalyze the reaction between the sulfamic acid and the alkaline agent. Calcium oxide reacts with water to generate calcium hydroxide, and magnesium sulfate combines with calcium oxide to break the cell wall to release the water inside the cell, solidify and dehydrate the protein in the cell, and improve the sterilization ability. Calcium chloride is used as a catalyst for the reaction of calcium oxide a...

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Abstract

The invention belongs to the field of treating and utilizing sludge, in particular relates to a method of regulating the stable pH value of sludge alkali. The method comprises the steps of feeding complex reagent into sludge dewatered primarily, stirring, mixing and reacting, wherein through taking the quantity of the treated sludge as a base number, the complex reagent comprises the following ingredients in percentage by weight: 5-8% of CaO, 0.5-2% of MgSO4, 0.5-2% of CaCl2, 0.5-1% of NaCl, and 0.1-0.5% of sulfamic acid. With the method, the sterilization capability is strong, the ash rate in the sludge is high, and the purification effect of heavy metal ions is good.

Description

technical field [0001] The invention belongs to the field of sludge treatment and utilization, and in particular relates to an alkali-stabilized pH value adjustment method of sludge. Background technique [0002] In recent years, with the rapid development of my country's economy and the enhancement of environmental protection awareness, a large number of new urban sewage treatment plants have been put into operation, but sludge treatment has become a new pollution problem. Therefore, while paying full attention to sewage treatment technology, whether the sludge problem can be solved well is also one of the decisive factors for the success of sewage purification. Therefore, it is necessary to strengthen the research on sludge treatment and utilization. [0003] Sludge from sewage treatment plants is generally composed of loose materials with a high water content (95% to 99%), bulky, unstable properties, and extremely perishable, which is not conducive to transportation and d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00
Inventor 张文标李良李福生李克军
Owner 张文标
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