Method for utilizing nano ferroferric oxide for improving activity of anaerobic digestion methanogens and methanogenesis efficiency

A technology of ferric tetroxide and methanogens, applied in chemical instruments and methods, special compound water treatment, water/sludge/sewage treatment, etc., can solve the problem of difficult control of dosage concentration, low bioavailability and high cost problems, to achieve the effect of increasing total production, increasing methane content, maintaining stable and high-speed operation

Inactive Publication Date: 2015-04-22
HARBIN INST OF TECH
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  • Description
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Problems solved by technology

[0005] The present invention is to solve the problem of Fe in the prior art 2+ /Fe 3+ In order to solve the problems of difficult control of dosing concentration, anion inhibition, low bioavail...

Method used

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specific Embodiment approach 1

[0013] Specific embodiment one: In this embodiment, a method for improving the activity and methane production efficiency of anaerobic digestion methanogens by using nano-ferric oxide is carried out according to the following steps:

[0014] 1. Add the anaerobic granular sludge obtained from the anaerobic expanded granular bed reactor to the continuous flow anaerobic reactor at a temperature of 35°C and a pH of 6.8 to 7.5, and use the culture medium as the continuous flow anaerobic reactor. For the feed water of the oxygen reactor, the external circulation flow rate is 100L / d, the feed water flow rate is 10L / d, and the hydraulic retention time is 6.5d. In the detection of methane content, when the chemical oxygen demand removal rate is 75% and the methane content in the biogas component is 35% to 40%, the inoculum slime is obtained; the continuous flow anaerobic reactor is equipped with an external circulation pump; The medium consists of CH 3 COONa, NH 4 Cl, KH 2 PO 3 、K ...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the pH of the mixed phase is adjusted to 7 in step 3. Others are the same as the first embodiment.

specific Embodiment approach 3

[0020] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the concentration of the inoculum slime in the mixed phase described in step 3 is 1.45 g / L. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method for utilizing nano ferroferric oxide for improving the activity of anaerobic digestion methanogens and methanogenesis efficiency. The method aims at solving the problems that in the prior art, the addition concentration of Fe2+/Fe3+ is hard to control, negative ion inhibition is caused, bioavailability is low, the chemical property is unstable, and cost is high. The method comprises the steps that short chain fatty acid salt is adopted as an electron donor, amine salt is adopted as a nitrogen source, phosphate is adopted as a phosphorus source, system basicity is maintained, and under the culture condition of continuous flow anaerobic fermentation, anaerobic mixed granule sludge is separated, and mixed seed sludge is obtained; the short chain fatty acid salt is adopted as the electron donor, the amine salt is adopted as the nitrogen source, the phosphate is adopted as the phosphorus source, the system basicity is maintained, the nano ferroferric oxide is adopted as an iron ion donor, the mixed seed sludge is adopted as inoculation sludge, and culturing is carried out under the static anaerobic fermentation condition. The method is used for improving the activity of the anaerobic digestion methanogens and the methanogenesis efficiency.

Description

technical field [0001] The invention relates to a method for improving the activity and methane production efficiency of anaerobic digestion methanogens by using nano ferric oxide. Background technique [0002] Rational use of energy and environmental pollution control are two key issues that affect my country's sustainable development. Developing biomass energy represented by biogas and changing the energy structure dominated by fossil energy is an effective way to solve energy problems; developing low-energy, high-efficiency environmental pollution control technologies and realizing efficient recycling of resources is an environmental protection field. one of the focus of work. As a comprehensive system that combines environmental governance, energy recovery and ecological virtuous cycle, anaerobic digestion is widely used in wastewater treatment, sludge treatment, urban domestic waste treatment, rural crop straw and livestock manure anaerobic fermentation and other aspec...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCC02F3/2866C02F3/346C02F11/04C02F2305/06Y02E50/30
Inventor 马文成钟丹钱风越辛红梅韩洪军
Owner HARBIN INST OF TECH
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