Technique for treating wastewater of molasses alcohol

Abstract

This invention discloses a process for micro-aerobic treatment of molasses alcohol wastewater. The process comprises: (1) introducing a small amount of oxygen into a micro-aerobic reactor to culture active sludge rich in sulfate-reducing bateria, methanogen and colorless sulfur bacteria; (2) adjusting the pH value of molasses alcohol wastewater to 6.5-7.0 in an adjustment pool, introducing into the sludge bed of the micro-aerobic reactor, and keeping the hydraulic retention time in the micro-aerobic reactor for 8-24 h; (3) reducing the sulfate in the wastewater into sulfide by sulfate-reducing bacteria, then oxidizing the sulfide into sulfur by colorless sulfur bacteria, and discharging sulfur with the outflow water; (4) introducing the biogas produced from methane into a gas-collection tank, and then refluxing to the precipitation zone of the micro-aerobic reactor; (5) refluxing the outflow water from the micro-aerobic reactor to the sludge bed at a refluxing rate of 50-300%. The process has such advantages as good treatment effect, and little pollution.

Description

technical field [0001] The invention relates to a waste water treatment process, in particular to a waste water treatment process produced in the production process of molasses alcohol. Background technique [0002] Although molasses alcohol wastewater has better biodegradability. However, because of its COD, SO 4 2- , chroma are particularly high, and the pH value is very low. It is a kind of organic industrial wastewater that is difficult to treat. At present, the treatment methods of molasses alcohol wastewater include: [0003] 1. Physical and chemical methods [0004] Such as flocculation sedimentation, evaporation concentration, centrifugation and so on. These methods have some effect. But there are obvious deficiencies. First, the treatment effect is not significant, and secondary pollution is likely to occur. Second, the treatment cost is very high, and it is only suitable as a pre-treatment or post-treatment process for wastewater treatment. [0005] Altho...

AI Technical Summary

Problems solved by technology

However, the anaerobic biological process requires the removal of sulfate ions first, otherwise, the reduction product of sulfate - sulfide will have a serious adverse effect on the anaerobic digestion process

This pretreatment process is not only expensive, but also produces a large amount of solid waste, resulting in secondary pollution

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

[0008] A single aerobic biological treatment process is rarely used due to its high energy consumption, especially for high-concentration organic wastewater such as molasses alcohol wastewater.

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