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Method for recycling wastewater obtained from cellulosic ethanol production

A technology for producing cellulose ethanol and waste water, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of polluting the environment, consuming large energy and cost, and difficult to meet discharge standards To achieve zero discharge of waste water, reduce environmental pressure, and save costs

Inactive Publication Date: 2012-10-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve the technical problem that it is difficult to meet the discharge standard after the wastewater from cellulosic ethanol production is treated, the discharge will pollute the environment, and the continuous advanced treatment needs to consume a lot of energy and cost, and provides a method for recycling the wastewater from cellulosic ethanol production

Method used

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specific Embodiment approach 1

[0012] Specific embodiment one: the method for the recycling of cellulose ethanol production wastewater in this embodiment is as follows:

[0013] 1. Mix 300-500ml of cellulose ethanol production wastewater biologically treated effluent with COD value of 200-1200mg / L and VFAs<50mg / L with 150g of steam-exploded straw, stir well, place for half an hour, and every 5min Stir once, then filter through a vacuum filter;

[0014] 2. Add the effluent after biological treatment of cellulose ethanol production wastewater with a COD value of 200-1200mg / L and VFAs<50mg / L to the filter residue obtained in step 1 to obtain a solid-liquid mixture, and the mass concentration of solids in the solid-liquid mixture Use sodium hydroxide to adjust the pH value of the solid-liquid mixture to 4.8-5.0, then sterilize at 121°C for 20 minutes, add 15-20g of cellulase, at a temperature of 50°C and a rotation speed of 100-150rpm Saccharify for 48 hours. After the saccharification is over, adjust the pH v...

specific Embodiment approach 2

[0027] Embodiment 2: This embodiment differs from Embodiment 1 in that the water content of the steam-exploded straw in step 1 is 10% to 30%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0028] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the COD value of the cellulose ethanol wastewater described in step one is 1000-1200 mg / L, the VFAs value is 30-50 mg / L, and the pH value is 7-8 , the total nitrogen concentration is 70-80mg / L, the total phosphorus concentration is 15-20mg / L, the calcium ion concentration is 30-40mg / L, the magnesium ion concentration is 15-20mg / L, and the zinc ion concentration is 0.2-0.4mg / L L. Others are the same as in the first embodiment.

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Abstract

The invention provides a method for recycling wastewater obtained from cellulosic ethanol production, relates to a wastewater treating method, and aims to solve the technical problems that after the wastewater obtained from the cellulosic ethanol production is treated, the wastewater difficultly reaches to the discharge standard, the environment is polluted by the discharge, and a large amount of energy and a large amount of cost needed by continuously deep treatment processing are consumed. The method comprises the following steps of: mixing output water obtained in a process of treating the wastewater obtained from the cellulosic ethanol production with steam exploded straws; placing for half an hour and filtering; continuously adding the output water obtained form the process of treating the wastewater obtained from the cellulosic ethanol production into filtering dreg, adjusting the pH (Potential of Hydrogen) value of a solid-liquid mixture and sterilizing; adding cellulase and saccharifying; after the saccharification is finished, adjusting the pH value under a sterile condition; and adding angel yeast and fermenting to obtain cellulosic ethanol. With the adoption of a wastewater recycling process disclosed by the invention, the wastewater obtained from the cellulosic ethanol production is completely recycled, so that zero discharging of the wastewater is realized and the environmental pressure is reduced; and the output water obtained in the process of treating the wastewater obtained from the cellulosic ethanol production can be used for a water washing detoxification process.

Description

technical field [0001] The invention relates to a wastewater treatment method. Background technique [0002] According to the International Energy Agency (IEA) statistics, 60% of oil consumption is vehicle fuel. Fuel ethanol can be mixed with gasoline in a certain proportion, and can also be used alone as a vehicle fuel. At the same time, ethanol is also a renewable energy source that can be produced by biology. Its combustion releases far less greenhouse gases than gasoline. Therefore, it is safe and clean. Ethanol is considered the most likely renewable energy source to replace petroleum. [0003] The current fuel ethanol production raw materials are mainly starchy biomass such as corn, wheat, cassava, and sugary raw materials such as sugar cane, sugar beet, sweet sorghum, etc. This type of ethanol is called first-generation ethanol. my country is a country with rapid economic development, fast energy consumption, small land and large population. The current national con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 冯玉杰于艳玲于丽新赵伟
Owner HARBIN INST OF TECH
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