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Preparation method of iron-containing sludge-based biochar material and application of same in anaerobic digestion

A biochar and sludge technology, applied in anaerobic digestion, special dry distillation, petroleum industry, etc., can solve the problems of reactor acidification, accelerate the electron transfer process between acid-producing bacteria and methanogenic bacteria, and achieve good conductivity The effect of charging and discharging ability

Inactive Publication Date: 2020-11-03
DALIAN UNIV OF TECH
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Problems solved by technology

At the same time, the present invention applies it to the anaerobic biological treatment of high-concentration organic sewage and waste, so that it can be used as an electroactive material to accelerate the electron transfer process between acid-producing bacteria and methanogenic bacteria, and alleviate the metabolic imbalance between the two bacterial groups. And it is easy to cause the problem of acidification of the reactor

Method used

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  • Preparation method of iron-containing sludge-based biochar material and application of same in anaerobic digestion
  • Preparation method of iron-containing sludge-based biochar material and application of same in anaerobic digestion
  • Preparation method of iron-containing sludge-based biochar material and application of same in anaerobic digestion

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example 1

[0026] A method for preparing iron-containing sludge-based biochar for strengthening microbial electron transfer, comprising the following steps:

[0027] 1) Take 50g of the remaining sludge produced after flocculation and sedimentation from the sewage treatment plant in a place containing FeCl 3 In the adsorption tank 1 of the solution, stir and mix for 24 hours to make the sludge fully absorb the ferric ions in the solution, and the FeCl 3 The concentration of the solution is 0 and 1g / L in iron, respectively, and the corresponding biochar materials are traditional sludge-based biochar and iron-containing sludge biochar according to the present invention.

[0028] 2) Use sodium bicarbonate to adjust the pH of the mud-water mixture to 7.0, then let it settle and discharge the supernatant. After getting the precipitated sludge, place it in the centrifuge 2, and use the centrifuge 2 to make the sludge Further dehydration. The rotating speed of the centrifuge is 8000 rpm, and t...

example 2

[0037] Start three anaerobic digestion reactors 6 using sucrose wastewater as a substrate, and the concentration of sucrose wastewater is 5000 mg COD / L. Add glass beads (the glass bead group is a blank group), traditional sludge-based biochar and the iron-containing sludge-based biochar of the present invention respectively in the three stable anaerobic digestion reactors 6, and add The concentration is 10g / L. The effect of adding materials on promoting anaerobic digestion is as follows: Figure 5 shown. The COD removal rate in the anaerobic digestion reactor 6 added with glass beads is about 31%, while the COD removal rate in the anaerobic digestion reactor 6 added with traditional sludge-based biochar and iron-containing sludge-based biochar is 52% respectively and 71%. This shows that adding the iron-containing sludge-based biochar of the present invention can increase the removal effect of organic matter in the anaerobic digestion reactor 6 by 40%, and its promotion eff...

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Abstract

The invention provides a preparation method and application of iron-containing sludge-based biochar, which comprises the following steps: pouring excess sludge, as a raw material, generated by an urban sewage treatment plant into a 1 g / L FeCl3 solution to flocculate and adsorb trivalent iron salt, dehydrating the sludge to obtain iron-containing sludge; and putting the iron-containing sludge intoa tubular furnace, firing for 2 hours at 600 DEG C under the condition of nitrogen blowing to obtain a sample, namely the iron-containing sludge-based biochar. Results show that at 600 DEG C, ferric iron adsorbed by the sludge is converted into ferroferric oxide, so that the electrical conductivity of the biochar is improved; meanwhile, functional groups on the surface of the biochar are reservedat the temperature, so that the iron-containing sludge-based biochar has good charge-discharge performance. The iron-containing sludge-based biochar is added into an anaerobic reactor, so that the removal rate of organic matters and the yield of methane can be remarkably increased.

Description

technical field [0001] The invention relates to the field of organic waste water and environmental protection treatment of objects. Background technique [0002] Anaerobic digestion technology is one of the effective methods to solve organic wastewater and organic solid waste. It has the advantages of low energy consumption, low sludge production and recyclable biogas. However, the operation of this technology is unstable, especially when dealing with high-concentration organic wastewater and high-solid organic waste, acid accumulation often occurs and anaerobic digestion fails. This greatly limits the application of anaerobic digestion technology in engineering. The main reason for the acid accumulation in the reactor is that the anaerobic digestion and methanogenesis is a multi-process and multi-component complex biochemical reaction, which requires the coordination and cooperation of various microorganisms, and the microorganisms in the anaerobic acid production process ...

Claims

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Application Information

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IPC IPC(8): C10B53/00C02F3/28
CPCC10B53/00C02F3/28
Inventor 张耀斌王名威李诗阳赵智强
Owner DALIAN UNIV OF TECH
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