Method for increasing methane production efficiency of continuous-flow anaerobic reactor by continuously adding Fe3O4 nanoparticles

An anaerobic reactor and nanoparticle technology, applied in chemical instruments and methods, anaerobic digestion treatment, water/sludge/sewage treatment, etc. Guaranteed efficient and fast operation

Inactive Publication Date: 2015-04-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problems of low biogas production and low operating efficiency in the domestic continuous flow anaerobic fermentation technology, and provides a method of continuously adding Fe 3 o 4 Nanoparticles to improve the efficiency of methane production in continuous flow anaerobic reactors

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  • Method for increasing methane production efficiency of continuous-flow anaerobic reactor by continuously adding Fe3O4 nanoparticles

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specific Embodiment approach 1

[0020] Specific implementation mode one: this embodiment mode is by continuous dosing Fe 3 o 4 The method for improving the methane production efficiency of a continuous flow anaerobic reactor by nanoparticles is carried out in the following steps:

[0021] 1. Wastewater is installed in the water distribution tank, the influent flow rate of the anaerobic reactor is controlled to be 10L / d, the hydraulic retention time is 20h, the external circulation flow rate is 100L / d, the influent COD is 5000mg / L, and the sludge concentration is 10g / L, the temperature of the anaerobic reactor is controlled at 34-36°C, by adding NaHCO 3 The solution controls the pH of the anaerobic reactor to be 6.8 to 7.2;

[0022] 2. The number of daily modulation is 2 times, and the modulation method is to add Fe 3 o 4 Nanoparticles, dosing method is solid dosing or liquid dosing, Fe 3 o 4 The particle size range of nanoparticles is 40-80nm;

[0023] When solid dosing, Fe 3 o 4 Nanoparticles are ...

specific Embodiment approach 2

[0028] Embodiment 2: This embodiment is different from Embodiment 1 in that: in step 1, the temperature of the anaerobic reactor is controlled to 35°C. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one, by adding NaHCO 3 The pH of the solution controlled anaerobic reactor was 7. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for increasing the methane production efficiency of a continuous-flow anaerobic reactor by continuously adding Fe3O4 nanoparticles and relates to a method for increasing the methane production efficiency of the continuous-flow anaerobic reactor. The method is used for solving the problems of low biogas yield and low operating efficiency of the continuous-flow anaerobic fermentation technology at home. The method comprises the following steps: firstly, feeding wastewater into a water-preparation tank, controlling the conditions of the anaerobic reactor to be as follows: the water effluent flow is 10L / d, the hydraulic retention time is 20 hours, the outer circulation flow is 100L / d, the water effluent COD is 5000mg / L, the concentration of sludge is 10g / L, the temperature of the anaerobic reactor is controlled at 34-36 DEG C and the pH of the anaerobic reactor is controlled at 6.8-7.2; secondly, daily controlling twice, wherein the controlling method is as follows: the Fe3O4 nanoparticles are added; and thirdly, detecting the yield of methane in the continuous-flow anaerobic reactor every two days. By the method, the yield of methane is significantly increased and the method is used in the field of wastewater treatment.

Description

technical field [0001] The invention relates to a method for improving the methane production efficiency of a continuous flow anaerobic reactor. Background technique [0002] Energy shortage and environmental pollution have gradually become the main bottleneck of the sustainable development of the world and our country. Therefore, the development of alternative energy is one of the hotspots that governments and scientists are concerned about. Among them, bioenergy is considered to be a substitute for fossil energy. Using anaerobic biological method to treat organic solid waste or sludge can not only reduce environmental pollution, but also obtain clean energy such as methane. Anaerobic biological treatment of sludge is usually divided into four stages: hydrolysis stage, acid production stage, acetic acid production stage, In the methanogenic stage, each stage is interdependent and continuous, and the microbial flora including hydrolytic bacteria, acidogenic fermentative bact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F11/04
CPCC02F3/2866C02F2209/02C02F2209/06C02F2209/28Y02E50/30
Inventor 马文成钟丹辛红梅钱风越韩洪军
Owner HARBIN INST OF TECH
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