Two-step biological hydrogen preparing process with raised hydrogen generating efficiency of organic waste water

Abstract

The present invention relates to biological treating technology of organic waste water or sewage, and is especially the biological hydrogen preparing process with organic waste water. The biological hydrogen preparing process includes introducing organic waste water to reactor with anaerobic hydrogen generating bacteria, and collecting and separating hydrogen; outputting the solution from the anaerobic fermenting reactor to regulating pond, and adding alkaline matter to regulate pH of solution to 6.5-7.0; and feeding the solution into photosynthetic reactor with photosynthetic hydrogen generating bacteria, and collecting and separating hydrogen for the second time. The said process has the fatty acid and alcohol produced in the anaerobic fermentation utilized fully in the second hydrogen production. The present invention has high hydrogen producing efficiency and high purification of organic waste water.

Description

Technical field:

[0001] The invention relates to a biological treatment technology of organic waste water or sewage, in particular to a method for biological hydrogen production using organic waste water. Background technique:

[0002] In the prior art, the use of anaerobic fermentation bacteria to treat organic wastewater while producing hydrogen has been gradually recognized by people. In 2003, the United States "Biotechnology and Process" (Biotechnology Progress, 2003, Volume 19, Phase 3, Pages 828-832) disclosed a method of using anaerobic fermentation bacteria to degrade organic matter in organic wastewater to obtain hydrogen Methods. In this method, the liquid-phase product produced by anaerobic fermentation hydrogen-producing bacteria using organic wastewater is input into a subsequent methane reactor, so that fatty acids and alcohols in the liquid-phase product are converted into methane by the methanogenic bacteria, and the hydrogen production efficiency of organic...

Examples

Embodiment 1

[0009] 1. Prepare simulated organic wastewater (similar in nature to food factory wastewater) and place it in container 1 for use. The preparation process is as follows: add 5 g / l sucrose to tap water, and add 374 mg / l NH at the same time 4 HCO 3 , 97mg / lK 2 HPO 4 .3H 2 O, formulated as organic wastewater. The chemical oxygen demand concentration of this organic waste water is 5.3g / l, uses 2mol / l HCl and 2mol / l NaOH solution to control pH value at 7.0 in organic waste water, puts into refrigerator and makes its temperature be 4 ℃. .

[0010] 2. Add anaerobic methane-producing sludge to the anaerobic fermentation reactor 3 to make its initial concentration 6.3g / l, and simultaneously use HCl to adjust the pH of the solution in the reactor to 4.0-4.5 to obtain anaerobic fermentation hydrogen-producing bacteria The anaerobic methanogenic sludge is the anaerobic methanogenic floc sludge of Anhui Fengyuan Chemical Co., Ltd. for the treatment of citric acid wastewater.

[0011]...

Embodiment 2

[0016] 1.2. Same as Example 1.

[0017] 3. The organic waste water in the container 1 enters the anaerobic fermentation reactor 3 (upflow type anaerobic sludge bed reactor) through the feed pump 2, and its diameter is 100mm, and the total volume is 4.7l, wherein the volume of the reaction zone is 2.1L, The pH value of the solution in the anaerobic fermentation reactor is 5.0, and the temperature is controlled at 36°C; The gas generated in the reactor 3 is collected and separated to obtain hydrogen after passing through the gas outlet 4 and the gas meter 5 . The flow rate of the feed pump 2 is controlled to be 1.94ml / min so that the hydraulic retention time of the organic wastewater in the reactor 3 is 18 hours. After 4 months of acclimation, reactor 3 can produce hydrogen stably, producing 0.10mol hydrogen per day. After conversion, the hydrogen production efficiency is 1.17mol hydrogen / mol glucose.

[0018] 4. the aqueous solution discharged from the outlet 6 of the anaero...

Embodiment 3

[0022] 1. Prepare simulated organic wastewater (similar in nature to flour mill wastewater) and place it in container 1 for use. The preparation process is as follows: add 25g / l starch to tap water, and add 1870mg / l NH at the same time 4 HCO3 , 485 mg / l K 2 HPO 4 .3H 2 O, prepared as organic wastewater, the chemical oxygen demand concentration of the organic wastewater is 29.6g / l, the pH is controlled at 5.5 by 2mol / lHCl and 2mol / lNaOH solution, and it is placed in a room temperature environment (15-20°C).

[0023] 2. Add anaerobic fermentation hydrogen-producing bacteria to reactor 3 to make the initial concentration 4.6g / l; anaerobic fermentation hydrogen-producing bacteria are obtained by heating anaerobic methane-producing sludge to 102°C for one and a half hours, anaerobically The oxygen-methanogenic sludge is the anaerobic methane-producing floc sludge produced by Fengyuan Chemical Co., Ltd. for the treatment of citric acid wastewater.

[0024] 3. the organic waste wa...

Technical field:

[0001] The invention relates to a biological treatment technology of organic waste water or sewage, in particular to a method for biological hydrogen production using organic waste water. Background technique:

[0002] In the prior art, the use of anaerobic fermentation bacteria to treat organic wastewater while producing hydrogen has been gradually recognized by people. In 2003, the United States "Biotechnology and Process" (Biotechnology Progress, 2003, Volume 19, Phase 3, Pages 828-832) disclosed a method of using anaerobic fermentation bacteria to degrade organic matter in organic wastewater to obtain hydrogen Methods. In this method, the liquid-phase product produced by anaerobic fermentation hydrogen-producing bacteria using organic wastewater is input into a subsequent methane reactor, so that fatty acids and alcohols in the liquid-phase product are converted into methane by the methanogenic bacteria, and the hydrogen production efficiency of organic...

Examples

Embodiment 1

[0009] 1. Prepare simulated organic wastewater (similar in nature to food factory wastewater) and place it in container 1 for use. The preparation process is as follows: add 5 g / l sucrose to tap water, and add 374 mg / l NH at the same time 4 HCO 3 , 97mg / lK 2 HPO 4 .3H 2 O, formulated as organic wastewater. The chemical oxygen demand concentration of this organic waste water is 5.3g / l, uses 2mol / l HCl and 2mol / l NaOH solution to control pH value at 7.0 in organic waste water, puts into refrigerator and makes its temperature be 4 ℃. .

[0010] 2. Add anaerobic methane-producing sludge to the anaerobic fermentation reactor 3 to make its initial concentration 6.3g / l, and simultaneously use HCl to adjust the pH of the solution in the reactor to 4.0-4.5 to obtain anaerobic fermentation hydrogen-producing bacteria The anaerobic methanogenic sludge is the anaerobic methanogenic floc sludge of Anhui Fengyuan Chemical Co., Ltd. for the treatment of citric acid wastewater.

[0011]...

Embodiment 2

[0016] 1.2. Same as Example 1.

[0017] 3. The organic waste water in the container 1 enters the anaerobic fermentation reactor 3 (upflow type anaerobic sludge bed reactor) through the feed pump 2, and its diameter is 100mm, and the total volume is 4.7l, wherein the volume of the reaction zone is 2.1L, The pH value of the solution in the anaerobic fermentation reactor is 5.0, and the temperature is controlled at 36°C; The gas generated in the reactor 3 is collected and separated to obtain hydrogen after passing through the gas outlet 4 and the gas meter 5 . The flow rate of the feed pump 2 is controlled to be 1.94ml / min so that the hydraulic retention time of the organic wastewater in the reactor 3 is 18 hours. After 4 months of acclimation, reactor 3 can produce hydrogen stably, producing 0.10mol hydrogen per day. After conversion, the hydrogen production efficiency is 1.17mol hydrogen / mol glucose.

[0018] 4. the aqueous solution discharged from the outlet 6 of the anaero...

Embodiment 3

[0022] 1. Prepare simulated organic wastewater (similar in nature to flour mill wastewater) and place it in container 1 for use. The preparation process is as follows: add 25g / l starch to tap water, and add 1870mg / l NH at the same time 4 HCO3 , 485 mg / l K 2 HPO 4 .3H 2 O, prepared as organic wastewater, the chemical oxygen demand concentration of the organic wastewater is 29.6g / l, the pH is controlled at 5.5 by 2mol / lHCl and 2mol / lNaOH solution, and it is placed in a room temperature environment (15-20°C).

[0023] 2. Add anaerobic fermentation hydrogen-producing bacteria to reactor 3 to make the initial concentration 4.6g / l; anaerobic fermentation hydrogen-producing bacteria are obtained by heating anaerobic methane-producing sludge to 102°C for one and a half hours, anaerobically The oxygen-methanogenic sludge is the anaerobic methane-producing floc sludge produced by Fengyuan Chemical Co., Ltd. for the treatment of citric acid wastewater.

[0024] 3. the organic waste wa...

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