Method for treating molasses alcohol waste water

A technology of molasses alcohol waste liquid and molasses alcohol waste water, which is applied in the direction of combustion method, heating water/sewage treatment, lighting and heating equipment, etc., and can solve problems such as ineffectiveness

Inactive Publication Date: 2012-07-04
广西皎龙能源科技有限公司
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[0016] Molasses alcohol waste liquid refers to the waste liquid that uses sugarcane molasses as raw material, the fermented mash is distilled in the alcohol crude distillation tower, and is discharged from the bottom of the crude distillation tower after the alcohol is distilled off. Different methods of alcohol production lead to different volumes and concentrations of waste liquid. Using atmospheric column distillation, 1 ton of alcohol produced produces 13 to 15 tons (average 14 tons) of waste liquid with a concentration of 8 to 12°BX. One ton of alcohol produced by high-pressure distillation (or atmospheric tower plus reboiler) produces 11-13 tons of waste liquid, with a Brix of 15.50-16.80° BX. Therefore, the use of differential pressure distillation equipment and technology can reduce the amount of wastewater by 21% compared with atmospheric distillation. Realize energy saving and consumption reduction.

[0017] Concentrate the waste liquid discharged from the bottom of...

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Abstract

The invention discloses a method for treating molasses alcohol waste water. The method is characterized by comprising the following steps: (1) concentrating molasses alcohol waste water in an evaporator, thereby obtaining the concentrated slurry; (2) discharging waster water in the evaporator in a form of vapor condensed water, wherein the condensed water is recycled for alcohol production; (3) preparing dry powder after the concentrated slurry is incinerated in an incinerator; or (4) combusting the concentrated slurry with combustibility in a boiler to generate vapor; and (5) recycling the vapor for alcohol production and heating in waste water concentration. The method is main used for recycling water and solids and heat in the waster water and is a method for comprehensive treatment and utilization. The molasses alcohol waste water is concentrated in the evaporator, then is prepared into the dry powder, or the concentrated slurry with combustibility is combusted to generate vapor, and then the vapor is recycled for alcohol production and waste water concentration. The waste water in the evaporator is recycled for alcohol production in the form of vapor condensed water, thus an alcohol production closed-loop water system without waste emission is realized.

Description

technical field [0001] The invention relates to a treatment method for waste liquid, in particular to a treatment method for molasses alcohol waste liquid. Background technique [0002] Molasses alcohol wastewater refers to the wastewater discharged from the by-product of sugar production in sugar factories, molasses, after the fermentation waste liquid is distilled out of alcohol in the primary distillation tower. 12-13 tons of waste water is discharged for every 1 ton of alcohol produced. Therefore, the emission is large. The CODCT of this alcohol waste liquid is as high as 100,000-200,000 mg / l, the BOD5 is 50,000-70,000 mg / l, and the pH value is 3.5-4. Although this waste liquid is non-toxic, a large amount of waste liquid is discharged into the river, causing the river to lack oxygen, fish and shrimps disappear, and the river water stinks, causing serious environmental pollution. In addition, the waste liquid contains about 10% of various organic substances with ferti...

Claims

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Application Information

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IPC IPC(8): F23G7/04C02F1/04
Inventor 温其全
Owner 广西皎龙能源科技有限公司
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