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Waste water circulating and reusing process for starch processing

A technology for wastewater recycling and starch processing, which is applied in the fields of neutralization water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc. It can solve the problems of secondary pollution and large equipment investment, and achieve water saving, low investment and operation. low cost effect

Inactive Publication Date: 2004-06-23
HEILONGJIANG LONGFENG CORN DEV
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Problems solved by technology

This sewage treatment method requires a large investment in equipment and is prone to secondary pollution.

Method used

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  • Waste water circulating and reusing process for starch processing
  • Waste water circulating and reusing process for starch processing

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Embodiment Construction

[0016] The entire process is shown in the figure. After the corn is cleaned of impurities, it is sent to the foaming workshop with water for foaming. There is a gravity sieve on the foaming tank for screening. After the pH value of the water is adjusted to 5.0-5.2, it is flocculated and settled by the settler, and the clarified water is recycled for transportation of corn. The water used in the foaming workshop is mainly for acid production, and the acid production uses process water to make sodium bisulfite to soak corn, which does not affect the soaking effect and saves energy wasted due to heating of clean water. After soaking, dilute corn steep liquor is subjected to three-effect evaporation, the water vapor generated by corn steep liquor evaporation and the secondary steam used for evaporating corn steep liquor are fully recycled, the condensed water of second-effect evaporation is sent to the settling tank, and the condensed water of zero-effect evaporation is sent to the...

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Abstract

The present invention discloses waste water circulating and reusing process in starch producing process. The waste water after corn conveying is pH regulated to 5.0-5.2 with lime water and flocculated and deposited in the depositor, and the processed water is used in corn conveying and corn soaking. Water after use in protein floating step is used mainly in milling corn, plumule washing, fiber washing, starch separation and other steps to replace clear water. The present invention can lower the water consumption greatly and reduce environmental pollution. The water consumption is only 1.2-2 cu m for producing one ton of starch.

Description

technical field [0001] The invention relates to the technical field of wastewater reuse in starch processing. Background technique [0002] The starch processing process is: after the corn is cleaned of impurities, it is sent to the soaking workshop for soaking. After soaking, it is added with water in the grinding section and then coarsely and finely ground with the corn. After grinding, it is washed by fibers, starch is separated and starch is swirled. After the process, it enters the starch dehydration and drying section to obtain starch products. [0003] After the corn is cleaned of impurities, it is sent to the foaming workshop with water for foaming. Due to the influence of sand, gravel and soil in the raw corn, the amount of clean water used in the feeding process is about 4m 3 / ton of starch, and all the water used is discharged. The water used in the foam material workshop is mainly acid water, and the amount of clean water is 1.5m 3 / ton of starch. After add...

Claims

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Application Information

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IPC IPC(8): A23J1/16C02F1/52C02F1/66C08B30/00
Inventor 王树贵郑建波黄福臣王宝成赵庆刚刘学录赵守明
Owner HEILONGJIANG LONGFENG CORN DEV
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