Method for treating molasses alcohol wastewater

A technology for molasses alcohol wastewater and wastewater, applied in anaerobic digestion treatment, food industry wastewater treatment, waste fuel, etc.

Inactive Publication Date: 2014-01-15
GUANGXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research shows that due to the composition characteristics and high C / N ratio of molasses alcohol wastewater, it is difficult to treat pure molasses alcohol wastewater with microorganisms, so it is necessary to find suitable raw materials for mixed fermentation or adopt other non-biological methods. The purpose of efficiently treating molasses alcohol wastewater has been achieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the ratio of COD of molasses alcohol wastewater to COD of pig manure water is 3:1, then the water is mixed, and when the COD is controlled at 2000-4000mg / L, the daily water intake is 0.48m 3 , and at the same time the same amount of water. Control the total volatile fatty acids (VFA) in the effluent to 3meq / L-4meq / L. When the total VFA is lower than 3meq / L, increase the COD of the influent (control it at 2000-4000mg / L). After 4 days of operation, the COD removal rate of mixed wastewater is 50%-70%, and the pure methane production can reach 0.24-0.35m 3 / sky.

Embodiment 2

[0021] When the influent COD is increased to 4000mg / L, the ratio of COD of molasses alcohol wastewater to COD of pig manure is 3:2, and 0.48m is injected every day. 3 , the COD removal rate of mixed wastewater is 70%, and the pure methane production can reach 0.36m 3 / sky.

Embodiment 3

[0023] Further increase the influent COD to 5000mg / L, start continuous sampling, and adjust the COD ratio of molasses alcohol wastewater and pig manure water to 3:1. After 3 days of operation, increase the influent COD to 7500mg / L, while maintaining molasses The ratio of COD of alcohol wastewater to COD of pig manure water is 3:1. After 7 days of stable operation, the removal rate of COD in the final mixed wastewater is 68%-72%, and the output of pure methane can reach 1.4-2.3m per day. 3 .

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Abstract

The invention relates to a method for treating molasses alcohol wastewater, comprising the steps of: mixing the molasses alcohol wastewater and pig effluents in proportion for anaerobic fermentation, wherein an anaerobic reactor is a pilot-scale internal circulation reactor, an effective volume is 2m<3>, an inflow COD (Chemical Oxygen Demand) is controlled between 4000 and 6000, and the water inflow is 1.5-2.2 m<3> every 24 hours. By using the method, the removal rate of wastewater COD can reach 72%, and the yield of pure methane reaches 2.45 m<3> per day. The method meets the requirement of manufacturers of producing alcohol by using molasses on wastewater treatment. Compared with the prior art, the method is simple and easy to operate and low in cost; and due to anaerobic fermentation, the renewable energy of methane is produced as heat energy for further use of enterprises or factories.

Description

technical field [0001] The invention belongs to the technical field of microorganism application and environmental protection, and in particular relates to a method for treating molasses alcohol wastewater. Background technique [0002] Molasses alcohol wastewater is a high-concentration organic wastewater produced in the process of fermenting and producing alcohol, using molasses, a by-product of sugar factory sugar production, as raw material. The output of this kind of wastewater is large, about 10-15 tons of wastewater is produced for every ton of alcohol produced. per production 1m 3 The aerobic organic matter discharged by alcohol is 0.6-1m 3 . Sugarcane molasses alcohol wastewater is a dark brown viscous acid wastewater with high solids, high concentration of organic matter, and high chroma. COD and BOD content up to 8×10 4 -12×10 4 mgL and 4×10 4 -5×10 4 mgL, the sulfate content is 1.5×10 3 -4×10 3 mg / L, the chromaticity is 2×10 3 -5×10 3 times, the total...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F103/32
CPCY02E50/30
Inventor 申佩弘黄振标武波陈健张俊亚蓝贤州唐咸来俸斌蒋承建
Owner GUANGXI UNIV
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