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Heat treatment-fermented hy drogen-generating method by preparing hydrogen from residual sludge for sewage treatment plant

A technology for sewage treatment plants and excess sludge, applied in water/sludge/sewage treatment, hydrogen production, sludge treatment, etc., to achieve the effects of improved dehydration, reduced sludge volume, and significant economic benefits

Inactive Publication Date: 2006-10-25
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention aims to solve the problem of treatment and disposal of excess sludge in sewage treatment plants, and at the same time recover the biomass energy in the sludge in the form of hydrogen

Method used

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  • Heat treatment-fermented hy drogen-generating method by preparing hydrogen from residual sludge for sewage treatment plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Adjust the excess sludge from the sewage treatment system to DS 9.93g / L (VS 6.23g / L), pretreat it at 80°C and 1 standard atmospheric pressure (atm) for 1 hour, and then cool it to 50-60 at room temperature. ℃, use a mechanical stirrer to stir the thermally pretreated sludge evenly, take 150ml of pretreated sludge and add it to a 310ml anaerobic fermentation tank, use high-purity nitrogen (99.99%) to bubble the sludge for 2 minutes, replace and remove Oxygen in the gas phase and liquid phase of the fermenter, then sealed, placed in an air bath shaker, kept in the dark with stirring (140-150 rpm × 37.0 ± 1.0 ° C). The maximum concentration of hydrogen in the biohydrogen obtained after anaerobic fermentation reaches 50.2%, and methane is also not detected in the biogas. The hydrogen production of sludge reached the maximum (7.67ml / gVS) at about 17 hours, after which hydrogen consumption occurred.

Embodiment 2

[0027] The concentration of the excess sludge was adjusted to DS 11.71g / L (VS 7.81g / L), pretreated at 121°C and 1.5 standard atmospheric pressure (atm) for 0.5 hour, and the operation thereafter was the same as in Example 1. The maximum concentration of hydrogen in the biogas obtained after anaerobic fermentation was 47.0%, and the presence of methane was not detected. The hydrogen production rate of the sludge reached the maximum (19.42ml / gVS) at about 32 hours, and then due to the growth of hydrogen-consuming bacteria, the hydrogen in the gas phase of the fermenter began to be consumed.

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Abstract

The invention is about a treatment-ferment integrated process and the operation method to produce hydrogen by the remaining sludge of the sewage treatment factory. The process includes the sewage adjustment, the preheating treatment and the anaerobic fermentation. The method is to adjust the density / pH firstly, then to heating pretreatment, last to anaerobic fermenting to produce the H2. The heating treatment can release the organic matter and prevent the methanation in the anaerobic digestion. The hydrogen production ratio can reach 19.42ml / gVS in the condition of temperature 121DEG C, pressure 1.5atm and time 0.5h. The consistency of the hydrogen in the biologic air can reach 47.0%. The sludge content has decreased and the dehydration has been improved. The invention can recovery the organic matter in the form of hydrogen energy.

Description

technical field [0001] The invention relates to an integrated process and operation method for biological hydrogen production, which is an integrated process and an operation method for producing hydrogen by anaerobic fermentation after conditioning and heat pretreatment by utilizing residual activated sludge of a sewage treatment plant. Background technique [0002] At present, energy mainly relies on fossil fuels, but this kind of energy reserves are limited, non-renewable, and produce CO when burned. 2 and NO, NO 2 , SO 2 Such as nitrogen and sulfur oxides, these substances are discharged into the atmosphere, which will seriously pollute the air. In order to realize the strategy of sustainable development, promote the coordinated development of economy and environment, and develop renewable and clean energy, it is a top priority. Renewable energy includes solar energy, water energy, wind energy, biomass energy, hydrogen energy, etc. Among them, hydrogen energy has att...

Claims

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Application Information

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IPC IPC(8): C01B3/02C02F11/00C02F11/04
CPCY02P20/10Y02W10/33Y02W10/37
Inventor 刘俊新肖本益
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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