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A method for preparing biogas by using straw combined with excess sludge

A technology of excess sludge and inoculated sludge, applied in sludge treatment, biological sludge treatment, fermentation and other directions, can solve the problem of low content of carbohydrates, etc., and achieve low production cost, shortened anaerobic reaction cycle, and economic benefits. considerable effect

Active Publication Date: 2019-11-05
XIAN HUINING PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing biogas by combining straw with excess sludge, so as to overcome the above-mentioned defects in the prior art. The present invention uses agricultural waste, straw, and excess sludge for anaerobic hydrolysis and fermentation to produce biogas. It not only solves the problem of low carbohydrate content in sludge during anaerobic fermentation, but also improves the efficiency and purity of anaerobic biogas production

Method used

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  • A method for preparing biogas by using straw combined with excess sludge
  • A method for preparing biogas by using straw combined with excess sludge
  • A method for preparing biogas by using straw combined with excess sludge

Examples

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Effect test

Embodiment 1

[0046] Step 1: Test the main indicators of the straw, cut it through a 60-mesh sieve, add a 10% sodium hydroxide solution to the straw at a solid-to-liquid ratio of 1:1, and pretreat it at 50°C for 30 minutes to obtain the pretreated straw. Treat the straw, measure its water content after pretreatment and save it for later use;

[0047] Step 2: Take back the excess sludge obtained from the treatment workshop of the domestic sewage plant, remove larger impurities, seal and keep the water in reserve, and test the components of the excess sludge and its supernatant.

[0048] Step 3: Use the anaerobic digestion sludge from the sewage treatment plant as the inoculation sludge. The inoculation sludge has an oval appearance, dark gray color and good performance. The dissolved organic matter in the anaerobic digestion sludge digestion liquid is used as the carbon source , after 7 days of aerated culture to improve the activity of hydrolytic acidification bacteria, then added to the hy...

Embodiment 2

[0053] Step 1: Test the main indicators of the straw, cut it through a 60-mesh sieve, add a 10% sodium hydroxide solution to the straw at a solid-to-liquid ratio of 1:1, and pretreat it at 50°C for 30 minutes to obtain the pretreated straw. Treat the straw, measure its water content after pretreatment and save it for later use;

[0054] Step 2: Take back the excess sludge obtained from the treatment workshop of the domestic sewage plant, remove larger impurities, seal and keep the water in reserve, and test the components of the excess sludge and its supernatant.

[0055] Step 3: The anaerobic digestion sludge taken from the sewage treatment plant is used as the inoculation sludge. The inoculation sludge has an oval appearance, dark gray color and good performance. Using dissolved organic matter in the digested liquid of anaerobic digested sludge as carbon source, aerated for 7 days to increase the activity of hydrolytic acidification bacteria, and then added to the hydrolytic...

Embodiment 3

[0060] Step 1: Test the main indicators of the straw, cut it through a 60-mesh sieve, add a 10% sodium hydroxide solution to the straw according to a solid-to-liquid ratio of 1:1, and pretreat the straw at 50°C for 30 minutes to obtain the pretreated straw. Treat the straw, measure its water content after pretreatment and save it for later use;

[0061] Step 2: Take back the excess sludge obtained from the treatment workshop of the domestic sewage plant, remove larger impurities, seal and keep the water in reserve, and test the components of the excess sludge and its supernatant.

[0062] Step 3: The anaerobic digestion sludge taken from the sewage treatment plant is used as the inoculation sludge. The inoculation sludge has an oval appearance, dark gray color and good performance. The dissolved organic matter in the digested liquid of anaerobic digested sludge was used as the carbon source, aerated for 7 days to increase the activity of the hydrolytic acidification bacteria, ...

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Abstract

The invention discloses a method for preparing marsh gas through combination of straws and excess sludge. The method comprises the following steps: pre-treating the straws and the excess sludge, culturing anaerobic inoculation sludge, starting a straw-sludge anaerobic fermentation system, generating and pre-treating a hydrolysis acidification solution, and optimizing a marsh gas gasification process. The method specifically comprises the following steps: inoculating and culturing anaerobic digestion sludge in a homemade hydrolysis acidification tank, adding the straws and the excess sludge subjected to pretreatment for preparing the hydrolysis acidification solution; then taking zeolite as an adsorbent for pre-treating the hydrolysis acidification solution; starting an anaerobic compound bed reactor, taking a hydrolysis acidification pretreatment solution as an external carbon source, and determining an optimal process condition of gasification of the marsh gas by regulating water supply load, hydraulic retention time and pH value in the reactor to generate high-purity marsh gas. The method is high in volumetric gas production rate, high in average specific marsh gas production rate, ideal in effect of removing COD of wastewater, low in preparation and treatment cost of marsh gas and free of secondary pollution to external environment.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and relates to a resource treatment technology of agricultural waste straw and excess sludge, in particular to a method for preparing biogas by combining straw and excess sludge. Background technique [0002] Biomass is a sustainable resource that can be continuously regenerated and used continuously through the atmosphere, water, earth and sunlight, such as agricultural waste straw, forest weeds and so on. my country is a large agricultural country with an area of ​​about 100 million mu of arable land. The potential biomass resources are very rich, and the comprehensive utilization rate of straw is not very high. A large amount of remaining straw is abandoned in the fields. The phenomenon of open burning of rice straw is very common all over the country. Direct burning is not only Destroying the environment is a waste of resources, and there are many hazards to production and life. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02C02F11/04
CPCC02F11/04C12P5/023Y02E50/30Y02W10/20Y02W10/37
Inventor 王森张安龙王学川张素风张丹
Owner XIAN HUINING PAPER
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