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Method for preparing flocculation aid for pretreating blue algae biogas slurry

A technology of coagulation aid and pretreatment, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of small flocs, difficult to settle, high solid content, and achieve the formation of large flocs, fast settling speed and waste residue moisture content. low effect

Active Publication Date: 2012-05-02
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the solid content in the cyanobacteria biogas slurry is high, it is difficult to settle, and the flocs produced by general flocculants are small

Method used

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  • Method for preparing flocculation aid for pretreating blue algae biogas slurry
  • Method for preparing flocculation aid for pretreating blue algae biogas slurry
  • Method for preparing flocculation aid for pretreating blue algae biogas slurry

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The monomer AM, the reducing agent pentaerythritol, and the oxidizing agent ceric ammonium nitrate were prepared in advance into aqueous solutions with a mass concentration of 5%, and 30mL of the AM solution and the reducing agent containing 1.8×10 -4 mol aqueous solution, the reaction bottle was evacuated (filled with nitrogen) for 3 times, sealed after fully deoxidizing, and 1.8×10 -4 mol of aqueous solution, shake the reaction bottle to mix evenly, then place the reaction bottle in a constant temperature water bath at 47.5°C, and react for 16 hours to obtain SPAM colloid. Add 0.02 mol of NaClO and 0.04 mol of NaOH at 10°C to the SPAM solution at 10°C under stirring, and react at 35°C for 20 minutes under temperature control to obtain the Hofmann rearrangement product of SPAM.

[0023] According to the mass ratio of starch to AM of 1:1.5, put 1g of soluble starch into the reaction kettle, add 20mL of distilled water, and gelatinize in a constant temperature water bath...

Embodiment 2-5

[0027] The difference between Examples 2-5 and Example 1 is that different monomer concentrations, oxidizing agent dosage, reducing agent dosage, NaClO dosage, NaOH dosage and starch dosage, other raw material dosage and operating conditions are used in the synthesis process of coagulant aid are the same. See Table 1 for the raw material ratios of Examples 1-5, and see Table 2 for the corresponding cyanobacterial biogas slurry treatment effects.

[0028] Table 1

[0029]

[0030] Table 2

[0031]

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Abstract

The invention relates to a method for preparing a flocculation aid for pretreating blue algae biogas slurry, and belongs to the technical field of wastewater treatment. The method comprises the following steps of: initiating free radical polymerization of an acrylamide (AM) monomer by using high-valence cerium salt and pentaerythritol as an oxidation reduction system to prepare star polyacrylamide (SPAM), performing chloramination reaction on the SPAM and NaClO, performing Hofmann rearrangement to convert part of amide group into an active isocyanate group, and reacting with .OH in starch to prepare starch-grafted-SPAM (ST-g-SPAM). A rigid and flexible reticular macromolecular structure is formed by grafting the polyacrylamide with a flexible star structure onto a rigid chain serving as aframework of the starch and has a more expanded conformation, so a better flocculation effect can be achieved compared with that of the common linear polymeric flocculant; and the flocculation aid has the characteristics of small using amount, wide adaptable pH range and the like, is convenient to operate and use, and is safe and non-toxic.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for preparing a coagulation aid for pretreatment of cyanobacteria biogas slurry. Background technique [0002] Cyanobacteria are rich in organic matter, and anaerobic fermentation to produce biogas is a relatively effective disposal method for the resource utilization of cyanobacteria. However, after anaerobic fermentation of cyanobacteria to produce biogas, a large amount of cyanobacterial biogas slurry will be produced, which contains high concentrations of COD, total phosphorus, and NH 3 - Pollutants such as N (COD is 350-1000 mg / L, TP is 80-350 mg / L, NH 3 -N is 15-90 mg / L, turbidity is 60-150NTU), and has a foul smell, it must be treated and discharged after reaching the standard, otherwise it will cause secondary pollution. At present, there are few reports on the treatment of cyanobacterial biogas slurry at home and abroad. In view of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 张文艺吴凌云范培成邱小兰李定龙
Owner 溧阳常大技术转移中心有限公司
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