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Method for improving methane production efficiency of sulfate organic wastewater

A technology for organic wastewater and sulfate, applied in chemical instruments and methods, water pollutants, waste fuels, etc., to achieve the effect of improving the methane production efficiency of sulfate organic wastewater, avoiding processes, and strengthening competitiveness

Inactive Publication Date: 2019-01-18
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, studies have shown that up to 20-50% of the electrons can still be used in the sulfate reduction process using this process, so there is a lot of room for improvement in the efficiency of methane production. Methane production efficiency is very necessary

Method used

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  • Method for improving methane production efficiency of sulfate organic wastewater
  • Method for improving methane production efficiency of sulfate organic wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) UASB reactor is used to inoculate the sludge from the anaerobic reactor of the sewage treatment plant. The VSS concentration of the inoculated sludge is about 50g / L. The sludge contains a large number of anaerobic microorganisms with high activity.

[0023] (2) if figure 2 As shown, the total volume of the reactor is 5.6L, the volume of the reaction zone is 2.9L, the inner diameter is 0.7dm, and the height is 10.6dm. The three sampling ports are distributed at 5.2dm, 7.2dm and 10.6dm respectively. A peristaltic pump is used to control the water inflow rate. A gas flow meter was installed at the outlet of the reactor to measure the volume of gas produced.

[0024] (3) Add 1.5g / L of single-walled carbon nanotubes, that is, 4.35g in the reactor, and the dosage is more than the theoretical value (1g / L), so as to prevent the loss of some carbon nanotubes during the start-up process.

[0025] (4) The reactor was aerated with nitrogen with a purity greater than 99.99%,...

Embodiment 2

[0031] Same as Example 1, the difference is that the dosage of single-walled carbon nanotubes is 2.0g / L, and the final result can be obtained: Compared with the ordinary anaerobic granular sludge system, the anaerobic "conductive" granular sludge The methane yield in the system increased by 21.4%.

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Abstract

The invention discloses a method for improving methane production efficiency of sulfate organic wastewater. The method comprises the following steps: taking anaerobic sludge; adding single-wall carbonnanotubes into the anaerobic sludge to form a mixed layer; then enabling the sulfate organic wastewater to pass through the mixed layer under an anaerobic environment; recycling methane generated inthe wastewater. Compared with the prior art, the method disclosed by the invention has the advantages that the single-wall carbon nanotubes are added to from anaerobic conductive particle sludge, andthe methane production efficiency of the sulfate organic wastewater can be remarkably improved; the methane yield can be improved by 20 to 30 percent. Furthermore, operation characteristics of a UASB(Upflow Anaerobic Sludge Blanket) are utilized and the carbon nanotubes be remained in a reaction system for a long period; a procedure of continuously adding the carbon nanotubes is avoided, so thata technology is simplified and the maintenance cost is reduced.

Description

technical field [0001] The invention relates to a method for improving the methane production efficiency of sulfate organic wastewater, and belongs to the technical field of extracting methane from wastewater. Background technique [0002] A large amount of sulfate-rich organic wastewater is produced in industrial production processes such as pharmaceuticals, chemicals, and papermaking. Compared with ordinary organic wastewater, the presence of sulfate increases the difficulty of anaerobic digestion. The reason is that the sulfate reduction process not only competes with the methanogenic process for electrons, but also the hydrogen sulfide formed will seriously inhibit the activity of methanogenic bacteria, leading to the accumulation of fatty acids and even the cessation of the methanogenic process, thereby greatly reducing the efficiency of methane resource recovery. The study proved that the reduction of 1 kg of sulfate can lead to a reduction of 0.23 cubic meters of meth...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/10C02F101/30
CPCC02F3/005C02F3/2846C02F2101/101C02F2101/30Y02E50/30
Inventor 沈楠梁柱陈赟王国祥
Owner NANJING NORMAL UNIVERSITY
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