Method for removing pigment of molasses alcohol wastewater by using biotechnology

Abstract

The invention discloses a method for removing a pigment of molasses alcohol wastewater by using a biotechnology, and is characterized by comprising the step of: taking the molasses alcohol wastewater and cellulose as a cultivation base to cultivate a molasses alcohol wastewater strain Bp-4, wherein the molasses alcohol wastewater strain Bp-4 can particularly grow in the molasses alcohol wastewater for directly treating the molasses alcohol wastewater, and can convert the pigment in the molasses alcohol wastewater into colorless within 6 to 8 hours, and a treatment method of two-decoloration and four-filtering and solid-liquid separation is adopted. If the molasses alcohol wastewater is treated by adopting the method, the treating time is short, the equipment occupies little space, the investment is little, the continuous treatment can be realized, and the molasses alcohol wastewater resources are fully utilized to produce biogas, fertilizer and feed protein, so that the cost for treating the molasses alcohol wastewater is greatly reduced, and huge profits can be obtained; and the produced biogas has purity of reaching 70 to 80 percent and the CODcr of less than 210 mg / l, and is colorless, thus recycling and discharging standards are met, the secondary pollution is prevented, the environment is protected, and better economic and social benefits are obtained.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for removing pigments from molasses alcohol waste liquid by using biotechnology. technical background [0002] The molasses alcohol waste liquid is the waste liquid that is discharged after the alcohol is distilled out in the distillation tower after fermentation with molasses as the raw material. The discharge of molasses alcohol waste liquid is large. For every ton of alcohol produced, the waste liquid discharged is 15-20 tons, which is the most serious source of pollution in the sugar industry. The concentration of CODcr and BOD5 in molasses alcohol waste liquid is relatively high, which belongs to high concentration organic waste liquid. Solid solution 12BX in molasses alcohol waste liquid, organic matter 70%, ash 18-25%, CODcr 120000-150000mg / l, of which refractory matter is more than 8500mg / l, accounting for 5.5-6% of the total CODcr. The waste liqui...

AI Technical Summary

Problems solved by technology

However, there are still deficiencies: the anaerobic treatment takes a long time, the initial start-up process of the reactor is slow, and due to the high organic concentration in the waste liquid, the waste liquid needs to be diluted before entering the anaerobic reaction.

The anaerobic biological process requires the removal of sulfate ions first, otherwise, the sulfate reduction product - sulfide will have a serious adverse effect on the anaerobic digestion process, resulting in low anaerobic efficiency, high aerobic load, and anaerobic digestion. The color removal effect of the molasses alcohol waste liquid by the method and the aerobic method is not obvious

In turn, the cost of water treatment is greatly increased, and a large amount of solid waste will be generated, resulting in secondary pollution, especially in the face of the treatment and disposal of a large amount of solid waste, which brings a heavy burden to the enterprise

A single aerobic biological treatment process is rarely used due to its high energy consumption, and it is not suitable to be directly used for high-concentration organic waste liquids such as molasses alcohol water

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