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A two-stage anaerobic digestion method for treating molasses alcohol wastewater

A technology for molasses alcohol wastewater and secondary anaerobic treatment, applied in anaerobic digestion treatment, chemical instruments and methods, natural water treatment, etc. Fermentation biogas and other issues, to achieve the effect of improving biogas yield and biomass energy recovery, good research and application prospects, and improving the effect of anaerobic treatment

Active Publication Date: 2019-10-25
WUXI MASHENG ENVIRONMENT ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of anaerobic biological treatment, the high concentration of sulfate in molasses alcohol wastewater will have an adverse effect on the effect of anaerobic digestion. On the one hand, sulfate will be reduced by sulfate-reducing bacteria (SRB) to generate more toxic sulfide. The activities of methanogens (MPB) and SRB in the sludge are inhibited. On the other hand, SRB utilizes substrates in the process of reducing sulfate radicals, thereby competing with MPB.
Sulfate, the reduction product of sulfate, can combine with H in wastewater + Generate H 2 S, which will lead to a large drop in biogas volume, and even make the anaerobic treatment process fail
Moreover, in the single-stage anaerobic reactor, due to the primary inhibition and secondary inhibition of SRB on MPB, the operation of the reactor will often be adversely affected or even cause failure.
[0004] In response to the above problems, the current solution is mainly to pretreat the wastewater, such as adding activated carbon to adsorb sulfate in wastewater or adding chemicals such as barium salts, Ca(OH) 2 The formation of precipitation with sulfate radicals can directly achieve the purpose of reducing sulfate radicals in wastewater; however, this physical method requires a large investment and is not suitable for large-scale treatment of molasses alcohol wastewater, and activated carbon adsorption will also adsorb COD, etc., affecting anaerobic fermentation Biogas production

Method used

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  • A two-stage anaerobic digestion method for treating molasses alcohol wastewater
  • A two-stage anaerobic digestion method for treating molasses alcohol wastewater
  • A two-stage anaerobic digestion method for treating molasses alcohol wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1 Experimental device diagram

[0021] The temperature of the reaction system of the two-stage UASB reactor for the treatment of molasses alcohol wastewater is 35°C, and the initial pH of the influent is adjusted to 7.20-7.50 with sodium carbonate solution. The generated biogas is desulfurized by a water-sealed bottle, measured by a wet gas flow meter, and then collected by a gas collection bag to determine the gas composition and content. Before and after the anaerobic digestion reaction, the pH, COD concentration, sulfate concentration and sulfide concentration of the wastewater were measured; after the reaction, the biogas volume and methane content were measured, and the determination methods were analyzed by national standard methods (Table 1 ).

[0022] Table 1 Analysis items and methods

[0023]

[0024] The experimental design is that the effective volume of the primary anaerobic UASB reactor is 12L, the volume of the reaction zone is 7.7L, the volu...

Embodiment 2

[0025] Example 2 Variation of anaerobic effluent pH

[0026] Depend on figure 2 It can be seen that the pH of the effluent of the two-stage anaerobic reactor is higher than the pH of the influent, and it shows an upward trend as the load increases. The reason for the increase of effluent pH value may be that the concentration of organic acids in the influent water is high. During the anaerobic digestion process, MPB and SRB directly use the organic acids in the wastewater to carry out metabolic activities such as methane production and sulfate radical reduction. The acid-producing bacteria are in In a weak position, the metabolic activity is inhibited, and the concentration of organic acids in the wastewater is reduced.

Embodiment 3

[0027] Embodiment 3 Influent and effluent COD concentration and COD removal rate variation

[0028] The degradation of wastewater COD is as follows: Figure 3-a and Figure 3-b shown. Depend on Figure 3-a It can be seen that with the increase of influent COD concentration, the removal of COD in the first-stage anaerobic digestion process first increases, then decreases and gradually stabilizes at about 45%. The COD removal rate of the primary anaerobic process was low at the initial stage of reactor operation, which may be due to the fact that the microorganisms in the sludge had not yet adapted to the molasses alcohol wastewater; when the reactor ran to the 9th day, the primary COD removal rate rose to 58.3%, indicating that the microorganisms had not yet adapted to the molasses alcohol wastewater; It basically adapts to wastewater, and can effectively use the organic matter in wastewater for metabolic activities; when the reactor runs to the 18th day, the primary COD rem...

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Abstract

The invention discloses a method for two-stage anaerobic digestion treatment of molasses alcohol wastewater, and belongs to the technical field of wastewater treatment, environmental protection and purification treatment. Anaerobic biological treatment is carried out on the molasses alcohol wastewater through a two-stage UASB reactor, so that the molasses alcohol wastewater is effectively treated, and harmless and resourceful utilization of the molasses alcohol wastewater is achieved.

Description

technical field [0001] The invention relates to a two-stage anaerobic digestion method for treating molasses alcohol wastewater, which belongs to the technical field of wastewater treatment and environmental protection purification treatment. Background technique [0002] Molasses alcohol wastewater has a high concentration of organic matter and sulfate, and has a large chroma. Its chemical oxygen demand (COD) is 80,000 to 120,000 mg / L, and the concentration of sulfate reaches 6,000 to 10,000 mg / L. About 15t of waste liquid is discharged for every 1t of alcohol produced. At present, a variety of processes and technologies for molasses alcohol wastewater treatment or resource utilization have been studied at home and abroad, such as anaerobic method, aerobic method, agricultural irrigation method, and feed production method, among which anaerobic biological method has a high processing load and accounts for With the advantages of small area and low energy consumption, it has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F103/32
CPCC02F3/2846C02F3/286C02F2103/325Y02E50/30
Inventor 赵明星陈阳阮文权
Owner WUXI MASHENG ENVIRONMENT ENERGY TECH CO LTD
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