Method for treating wastewater containing high-concentration fuel ethanol by utilizing wheat and other gains as main raw materials

Abstract

The invention discloses a method for treating wastewater containing high-concentration fuel ethanol by utilizing wheat and other gains as main raw materials. The method comprises the following steps: carrying out anaerobic treatment in an intermediate temperature fermentation upflow anaerobic sludge blanket (UASB) retort by using primary anaerobic treatment and secondary aerobic treatment; after the effluent potential energy of anaerobic effluent is reduced by an energy dissipation jar and partial anaerobic sludge is precipitated, feeding the anaerobic effluent into a pre-aeration pool; and after passing through a sedimentation pool, causing pre-aeration pool effluent to a sequencing batch reactor (SBR) pool for aeration and precipitation so that the effluent reaches the emission standard. Marsh gas generated in an anaerobic fermentation jar can be used as a renewable energy source to be fed into a marsh gas cabinet for marsh gas generation, generated electricity energy can meet sewage treatment electro-requirement and then the residual electricity energy can be supplied for fuel ethanol production. The remained sludge generated in a marsh gas production and sewage treatment process is subjected to concentrated separation and then is dried by using high-temperature tail gas generated in marsh gas generation so as to obtain an organic fertilizer. The method has the advantages of low operation cost and high treatment efficiency, the whole sewage treatment system achieves zero energy supply, the generated electricity energy is slightly remained, and the anaerobic effluent in the operation process has less possibility of incrustation and blockage, thereby achieving the win-win purpose of environment and energy source.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for treating high-concentration fuel ethanol waste water with wheat and other grains as main raw materials. [0002] The bio-fermentation of aging grains (wheat and other grains) produces fuel ethanol as bio-energy, and the by-products in the production process are processed to make DDGS feed, gluten and biogas, so as to truly achieve sustainable development And comprehensive and comprehensive utilization, this process is suitable for the treatment of fermentation industrial wastewater with wheat and other grains as the main raw materials. Background technique [0003] With the further expansion of fossil fuel mining, there will be less and less available oil, natural gas, coal and other mineral deposits. The energy crisis has become a key factor restricting the economic development and people's living standards of each country. [0004] To produce ...

AI Technical Summary

Problems solved by technology

Due to the certain phytate contained in grains such as wheat, it will interact with Mg in an anaerobic environment. 2+ and NH 4 + -N produces crystalline salt, which is often referred to as struvite, which scales in the pipeline and blocks the pipeline, increases maintenance costs, affects normal sewage treatment, and makes it difficult to make the effluent meet the "Comprehensive Sewage Discharge Standard" (GB8978-1996) The first-level emission standard for alcohol industry emissions, and the generated sludge and biogas cannot be effectively used, so the existing technology can no longer meet the requirements of the circular sustainable economic development advocated by the state

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