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Method for deep dehydration of residual activated sludge

A technology of residual activity and deep dehydration, which is applied in dehydration/drying/concentrated sludge treatment, preparation of organic fertilizer, organic fertilizer, etc. It can solve the problems of high water content in residual activated sludge and difficulty in effective implementation, and achieve easy operation , promote development, and have low equipment requirements

Inactive Publication Date: 2011-05-18
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for deep dehydration of excess activated sludge that is economical in use of materials, easy to operate, and suitable for large-scale intensive production, and solves the problem in the prior art that the water content of excess activated sludge is too high to be effective. Implementation and other issues, deep dehydration of the remaining activated sludge in sewage treatment plants

Method used

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  • Method for deep dehydration of residual activated sludge

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Effect test

Embodiment 1

[0016] Collect 100kg of residual activated sludge through mechanical dehydration, put it in a 500L reaction tank, add 20L of waste gulonic acid mother liquor (weight is 26-27 kg, wherein short-chain organic acids account for 60wt%), stir evenly, make it in slurry state, Heat the tank to 90°C, keep it warm for 1 hour, export the reaction solution to a water tank, add 10kg of corncob crumbs, stir evenly until it becomes thick sauce, move it into a ventilated oven and bake at 100°C for 6 hours to make dry sludge, sludge The water content of the mixture is 18wt%.

[0017] In this embodiment, the guaronic acid mother liquor is one or more mother raffinate left after extracting gulong acid crystals in the production of Vc. In terms of weight percentage, the main composition of the short-chain organic acid in the guaronic acid mother liquor is as follows: 20% guaronic acid, 40% formic acid, 10% oxalic acid, 15% propionic acid and 15% butyric acid.

Embodiment 2-5

[0019] The concrete process of embodiment 2-5 is the same as embodiment 1, differs from embodiment 1 in that the specific ingredients are shown in table 1.

[0020] Table 1. Ingredients in Examples 2-5

[0021]

Embodiment 6

[0023] Collect 100kg of residual activated sludge after mechanical dehydration, put it in a 500L reaction tank, add 40L of waste organic acid mother liquor, stir evenly to make it into a slurry, heat the tank to 60°C, keep it warm for 4 hours, and export the reaction solution to a Water tank, add 20kg sawdust, stir evenly to thick sauce, move into drum dryer 200 ℃ and dry for 4 hours, make dry sludge, the water content of sludge mixture is 15wt%.

[0024] In this embodiment, the discarded organic acid mother liquor is the discarded mother liquor produced in the extraction of oxalic acid, wherein the concentration of oxalic acid is 40 wt%.

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Abstract

The invention relates to a method for deep dehydration of residual activated sludge, particularly to a novel technique for realizing deep dehydration of residual activated sludge by applying waste organic acid mother liquor. The method is as follows: collecting the residual activated sludge which is dehydrated mechanically, adding 20-50% of waste organic acid mother liquor based on weight of the residual activated sludge, mixing the mixture to be slurry, putting the slurry into a reaction kettle and heating to 60-100 DEG C for reaction for 0.5-5h, during which the living biological substancescontained in the sludge are decomposed, the protein denatures and the bound water in the sludge changes to be free water and exudes; and after the reaction is finished, transferring the resultants into a mixing pool, adding plant debris and the like which serve as fillers, when the mixture turns to be thick catsup, putting the mixing pool into a drying device, and drying until the water content is 10-20wt% to get dry sludge. After heavy metal content detection, the dry sludge can be classified into different grades to be used as compost for farmers or to be as fuel for fuel suppliers. The invention solves the problems that due to high water content, the residual activated sludge is difficult to be effectively used in the prior art, and the method is suitable for large-scale intensive treatment and reclamation of residual activated sludge.

Description

Technical field: [0001] The invention relates to a method for deep dehydration of excess activated sludge, in particular to a new process for realizing deep dehydration of excess activated sludge by using waste organic acid mother liquor. Background technique: [0002] Activated sludge is a general term for microbial groups and the organic and inorganic substances they are attached to. Microbial groups mainly include bacteria, protozoa and algae. Among them, bacteria and protozoa are the two main categories. Activated sludge is mainly used to treat sewage and wastewater, which is an aerobic biological treatment method. The basic concept of activated sludge was discovered by the British Clark and Cage in 1912 that long-term aeration of wastewater would produce sludge and significantly improve the water quality. After further research, Arden and Lackett found that because the experimental container was not cleaned, the bottle wall Leaving residue on the contrary improves the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12C05F17/00
CPCY02W30/40
Inventor 徐慧李娜娜吕淑霞杨伟超张忠泽
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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