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Biochemical treatment method for waste water from small and medium-sized starch factories

A technology for biochemical treatment and starch wastewater, applied in the direction of flocculation/sedimentation water/sewage treatment, chemical instruments and methods, flotation water/sewage treatment, etc., can solve the problems of waste of resources and low technical content, and achieve reduced consumption and flocculation The effect of good effect, significant economic benefit and social benefit

Inactive Publication Date: 2011-11-23
菏泽三垒塑业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method has low technical content, and some resources in the wastewater are still wasted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The present invention is a method for biochemical treatment of wastewater from a small and medium-sized starch factory. The detailed steps of the biochemical treatment method are as follows:

[0032] a. First, add the organic polymer flocculant polyacrylamide aqueous solution and the inorganic flocculant polyaluminum chloride aqueous solution to the starch wastewater, and then stir and mix uniformly to obtain a mixed liquid, and stable floccules are formed in the mixed liquid; the polypropylene The mass percentage concentration of the amide aqueous solution is 0.08%, and the addition amount of the polyacrylamide aqueous solution accounts for 3% of the total weight of the starch wastewater; the mass percentage concentration of the polyaluminum chloride aqueous solution is 8%, and the addition of the polyaluminum chloride aqueous solution The amount is 1.5% of the total weight of starch wastewater;

[0033] b. Introduce the evenly mixed mixed liquid in step a into the air flot...

Embodiment 2

[0037] Embodiment 2: It is basically the same as embodiment 1, except that:

[0038] In step a: the mass percentage concentration of the polyacrylamide aqueous solution is 0.05%, the added amount of the polyacrylamide aqueous solution accounts for 4% of the total weight of the starch wastewater; the mass percentage concentration of the polyaluminum chloride aqueous solution is 10% , The amount of polyaluminum chloride aqueous solution added accounts for 1.0% of the total weight of starch wastewater;

[0039] In step b: when drying by a tube bundle dryer, the drying conditions are normal pressure, the drying temperature is 50° C., and the drying time is 4 hours.

Embodiment 3

[0040] Embodiment 3: It is basically the same as Embodiment 1, except that:

[0041] In step a: the mass percentage concentration of the polyacrylamide aqueous solution is 0.1%, and the added amount of the polyacrylamide aqueous solution accounts for 2% of the total weight of the starch wastewater; the mass percentage concentration of the polyaluminum chloride aqueous solution is 5% , The amount of polyaluminum chloride aqueous solution added accounts for 2% of the total weight of starch wastewater;

[0042] In step b: when drying by a tube bundle dryer, the drying conditions are normal pressure, the drying temperature is 45° C., and the drying time is 5 hours.

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Abstract

The invention discloses a biochemical treatment method for waste water from small and medium-sized starch factories. The biochemical treatment method comprises the following steps of: stirring an organic flocculating agent and an inorganic flocculating agent in waste water, so that flocculate is formed in mixed solution; performing air floating separation on the mixed solution formed by stirring by using an air floating tank to separate suspended matters from the waste water; filtering separated effluent and dehydrating to obtain starch protein and filter liquor; guiding the filter liquor into an internal circulation (IC) reactor to perform biochemical treatment, and guiding liquid which is subjected to the biochemical treatment into a membrane biological reactor (MBR) for separating; and drying and recycling sludge obtained by separation, and discharging or recycling obtained subnatant which meets the national sewage discharge standard directly. By the biochemical treatment method, a large amount of starch waste water can be treated effectively and the starch protein and methane can be recovered in the waste treatment process, so that resources are utilized to a maximum degree to create obvious economic and environmental benefit.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a biochemical treatment method for medium and small starch factory wastewater. Background technique [0002] Starch is an important industrial raw material. In addition to food and processed food, starch is widely used in industries such as textile, papermaking, medicine, fermentation, casting, adhesive, chemical industry, machinery and drilling. However, in the process of starch processing, a large amount of high-concentration acidic organic wastewater will be produced. The organic wastewater contains a large amount of residual starch, glucose, fructose, maltose and other carbohydrates, protein and organic acids, etc., which is easy to be corrupted and smelly, and the chemical oxygen demand COD The content is often between 1000-30000mg / L; in addition, the concentration of total nitrogen and phosphate in starch wastewater is high, which is one of the most polluted wastewater in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14A23K1/00C02F1/52C02F1/56C02F1/24A23K20/147A23K40/00
Inventor 周振民
Owner 菏泽三垒塑业股份有限公司
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