Treatment method of potato type non-grain starch fuel ethanol distiller solution

Abstract

The invention relates to a treatment method of potato type non-grain starch fuel ethanol distiller solution. The method comprises the following steps: waste distiller solution is pretreated simply and adjusted by an adjusting tank and then enters an anaerobic treatment system, wherein the first-stage anaerobic treatment adopts well mixed high temperature anaerobic fermentation and the second-stage anaerobic treatment adopts a medium temperature UASB anaerobic reactor; different microorganisms are utilized to degrade the organic pollutants in the wastewater and generate biogas; a cooling device, a setting tank and an air flotation device are arranged between the two anaerobic reactors to ensure the concentration of the well mixed high temperature anaerobic sludge; the two-stage anaerobic effluent enter two serial sections of oxidation ditches to further remove the organic matter; different denitrification technologies are selected according to ammonia nitrogen indexes to obtain stable denitrification effect; and finally flocculation precipitation and physicochemical treatment are performed, and the obtained water meets the standards and is discharged. The method of the invention has low cost, stable technology and high biogas extraction efficiency of wastewater; and the obtained sludge is used as organic fertilizer and the effluent meet the grade A standard of the integrated wastewater discharge standard (GB8978-1996) for the alcohol industry.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and resource comprehensive utilization, and in particular relates to a treatment method for a large amount of high-concentration and high-solid-content organic waste liquid produced in the production process of potato non-grain starchy fuel ethanol, so as to ensure the production process of fuel ethanol. The waste water is discharged up to the standard, and resource utilization is used to obtain green energy biogas. Background technique [0002] Fuel ethanol has the characteristics of cleanness and regeneration, which can reduce the emission of carbon monoxide and hydrocarbons in automobile exhaust. It is an important part of renewable energy. important role in increasing income. At present, the national strategic plan for the development of fuel ethanol requires "not to compete with others for food, not to compete with food for land", actively and scientifically develop non-grain fuel e...

AI Technical Summary

Problems solved by technology

Potato starchy fuel ethanol mainly includes root starchy raw materials such as cassava and sweet potato. Because of its good processing performance, it has been used as an ideal substitute raw material for large-scale fuel ethanol production. In the production process of potato non-grain starchy fuel ethanol A large amount of acidic, high-temperature and high-concentration organic wastewater is produced, and 11-15 tons of process wastewater can be produced for every 1 ton of fuel ethanol produced. Large, high content of suspended solids and difficult solid-liquid separation. However, the waste water produced in the process of producing fuel ethanol from non-grain starch raw materials also faces many problems in the process of meeting the discharge standards: such as high content of suspended solids and difficult treatment , the processing cost is high, and it is difficult to apply to large-scale industrialization development, etc.

Traditional tuber ethanol wastewater is generally treated with the "first-level anaerobic + aerobic" process after solid-liquid separation, but the traditional process has high pre-treatment costs, large investment, and instability, which brings inconvenience to subsequent anaerobic treatment , it is easy to impact the system. In addition, due to the high suspended solid content of this type of wastewater, there are disadvantages in the application of high-efficiency anaerobic reactors UASB and EGSB, and there is a problem of clogging caused by cassava residue entering the treatment system. Large-scale fully mixed anaerobic reactors Fermentation is not easy to stir evenly, sludge loss problem (digested sludge is not easy to settle and recover), etc. At the same time, the viscosity of the first-stage anaerobic effluent is high, and liquid-solid separation is difficult. The volume load of the anaerobic operation of the whole waste water is usually 2.5KgCOD / m 3 .d or so, affecting fuel ethanol production and economic benefits. The traditional method needs to separate the sludge from the high-temperature anaerobic digestion solution and return it to the first-level high-temperature anaerobic tank, resulting in a significant increase in energy consumption and investment, and is not suitable for large-scale treatment systems.

At the same time, the suspended solids cannot be effectively removed before entering the secondary anaerobic reactor, and the SS content is still as high as 6000-12000mg / l, which seriously affects the continuous and efficient operation of subsequent anaerobic reactors such as UASB.

The energy (biogas) in the wastewater cannot be extracted to the maximum extent. At the same time, the ammonia nitrogen cannot be effectively removed after the traditional aerobic process, and the removal rate of nitrogen and phosphorus is difficult to achieve a stable effect.

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