Method for multipurpose use of starch, spirit wastewater and equipment thereof

Abstract

The invention discloses the method and equipment of the amylum and alcohol wastewater comprehensive utilization. The method is that: the wastewater with high concentration flowing out from an ethanol distillation tower or an amylum pool first passes through an up-flow reactor to interact with the anaerobe in the reactor; the sediment settles in the reactor and is sent to marsh gas tank for fermentation or works as the maggot feed; the clear liquid enters the counterimpact jet gas mixing device and then enters an oxidation pond after absorbing the CO2 collecting from an alcohol fermentor; the aquatic energy crops with high yield are planted in the oxidation pond and can work as feed after harvest; the clear water can work as the production cooling water or is used for cleaning the equipments; the waste rootstalk after the aquatic energy crops are harvest, the animal wastes in the feeding farm and the residua are sent to the marsh gas tank for fermentation together; the marsh gas is used for the firing boiler to produce steam or is directly led in the direct-fired gas generator. The invention can treat the crude amylum with high concentration and difficulties, alcohol wastewater and wastes to be used at present, thereby can reach the demand of the power supply of the basical production and life.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of industrial waste water, in particular to a method and equipment for utilizing high-concentration organic waste water produced in starch and alcohol production processes. Background technique [0002] Alcohol waste liquid includes molasses alcohol waste liquid and starch alcohol waste liquid. It is the waste mash that is discharged after fermentation with molasses or starch, a by-product of sugar factory sugar production, and the mash is distilled out of alcohol in the distillation tower. Its emissions are large, equivalent to more than 13 times that of alcohol production, and it is the most serious source of pollution in light industry. Its chemical oxygen consumption (COD) is above 100,000 mg / l, and its biochemical oxygen consumption (BOD) is above 3,000 PPM. It has dark color, high acidity, and is easy to stink. Alcohol waste liquid discharged from an alcohol factory with a daily outp...

AI Technical Summary

Problems solved by technology

For example: 1. The flocculation and sedimentation method is used to treat starch wastewater. Although this method has the advantages of less infrastructure investment, simple process, easy operation, low energy consumption, and strong adaptability to temperature changes, the removal efficiency of flocculation and sedimentation method is low, especially for wastewater. The removal rate of small and medium molecular organic matter is lower, and it often needs to be used in combination with other treatment methods, so that the wastewater can be discharged up to the standard

2. Although the air flotation method has the advantages of short separation time, simple device, large processing capacity, and small footprint, the treatment efficiency of the air flotation method is related to the feeding position, air intake, liquid level, air flotation, etc. The operating conditions such as the amount of agent are closely related, and the operation management is complicated. At the same time, the performance requirements of the processing equipment are high, and the investment cost and operating cost are high.

3. Biological treatment of starch wastewater has mature and reliable technology, strong impact resistance, and good treatment effect. In particular, the anaerobic biological treatment process with UASB reactor as the main body can recycle energy methane gas while degrading pollutants. Wastewater treatment has been widely used, but the biological treatment method occupies a large area, consumes a lot of energy, has high investment and operating costs, and is greatly affected by environmental conditions such as wastewater temperature, pH, and toxic substances.

4. The photosynthetic bacteria method for treating starch wastewater has high removal rate of organic pollutants, low investment, less land occupation, and bacterial sludge is a protein feed that is harmless to humans and animals and rich in nutrition. It is a very promising purification method. Treatment technology for high-concentration organic wastewater. However, the photosynthetic bacteria method is sensitive to temperature changes and requires corresponding heating and heat preservation devices. At night, it needs strong white weave lighting, high operating costs, and inconvenient management.

[0007] For the above-mentioned treatment method of alcohol waste liquid and starch waste water, the inventor thinks that if it is simply used as sewage treatment or comprehensive utilization of some useful substances, it is far from enough, because no matter the alcohol waste liquid or starch waste water, the treatment process requires relatively large investment. Multiple devices and a lot of space are occupied, and many methods cannot achieve zero emissions, and the recovery of many useful resources also involves cost issues

In addition, for alcohol factories, the fermentation process of molasses or starch will release a lot of carbon dioxide. It is estimated that 1 ton of carbon dioxide will be produced for every ton of alcohol produced. These carbon dioxides are rarely recovered

This will cause waste and will also increase the concentration of carbon dioxide in the earth's atmosphere and damage the ecological environment.

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