Biotreatment method for efficiently purifying biogas slurry with microalgae

A biological treatment and microalgae technology, which is applied in biological water/sewage treatment, chemical instruments and methods, biofuels, etc., can solve problems not involved in microalgae treatment and achieve good market promotion effect

Inactive Publication Date: 2014-03-26
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Another example is a method disclosed in the Chinese patent application document (publication number: CN102392052A) that uses biogas slurry to cultivate self-supporting freshwater microalgae,...

Method used

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  • Biotreatment method for efficiently purifying biogas slurry with microalgae

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Embodiment 1

[0019] Using straw and pig manure as raw materials, biogas slurry is produced after fermentation. The COD in the biogas slurry is 3500-3800mg / L, the TN is 250-300mg / L, and the TP is 120-150mg / L. Flow the above biogas slurry into the aeration tank, add activated sludge for aeration pretreatment, the aeration time is 15h, and the standing time is 10h. After the aeration pretreatment, the biogas slurry flows into the filter screen of the aeration tank First-level photobioreactor, microalgae are inoculated in the first-level photobioreactor, and the temperature of the reactor is 27°C and cultivated for 6 days. After most of the pollutants are degraded, the wastewater enters the second-level photobioreaction The sewage containing microalgae is reacted at the reactor temperature of the secondary photobioreactor at 27°C for 5 days, relying on the action of the microalgae to degrade the pollutants, and the nitrogen and phosphorus degradation rate reaches more than 80%. The algae waste...

Embodiment 2

[0021] Using straw and pig manure as raw materials, biogas slurry is produced after fermentation. The COD in the biogas slurry is 3500-3800mg / L, the TN is 250-300mg / L, and the TP is 120-150mg / L. Flow the above biogas slurry into the aeration tank, add activated sludge for aeration pretreatment, the aeration time is 10h, and the standing time is 8h. After the aeration pretreatment, the biogas slurry flows into the aeration tank after passing through the filter screen First-level photobioreactor, inoculate microalgae in the first-level photobioreactor, and cultivate it for 5 days at the temperature of the reactor at 25°C. After most of the pollutants are degraded, the wastewater enters the second-level photobioreaction The sewage containing microalgae is reacted at the reactor temperature of the secondary photobioreactor at 25°C for 4 days, relying on the action of microalgae to degrade the pollutants, and the nitrogen and phosphorus degradation rate reaches more than 80%. The a...

Embodiment 3

[0023] Using straw and pig manure as raw materials, biogas slurry is produced after fermentation. The COD in the biogas slurry is 3500-3800mg / L, the TN is 250-300mg / L, and the TP is 120-150mg / L. The above biogas slurry is flowed into the aeration tank, and activated sludge is added for aeration pretreatment. The aeration time is 18 hours, and the standing time is 12 hours. After the aeration pretreatment, the biogas slurry flows into the filter screen of the aeration tank First-level photobioreactor, microalgae are inoculated in the first-level photobioreactor, and the temperature of the reactor is 30°C and cultivated for 8 days. After most of the pollutants are degraded, the wastewater enters the second-level photobioreaction The sewage containing microalgae is reacted at the reactor temperature of the secondary photobioreactor at 30°C for 7 days, relying on the action of microalgae to degrade the pollutants, and when the degradation rate of nitrogen and phosphorus reaches mor...

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Abstract

The invention belongs to the technical field of biological environmental protection, and relates to a treatment method of wastewater, in particular to a biotreatment method for efficiently purifying biogas slurry with microalgae. The treatment method comprises the steps that the original biogas slurry flows into an aeration tank for aeration pretreatment, and flows into a primary photobioreactor after passing through a filter screen of the aeration tank; the microalgae is inoculated in the primary photobioreactor and reproduced for 5-8 days; after most pollutants are degraded, wastewater enters a secondary photobioreactor for reaction for 4-7 days in the secondary photobioreactor; after the nitrogen and phosphorus degradation rate reaches above 80%, the wastewater containing the microalgae flows into a filter device with a storage groove; the microalgae is filtered and separated; the separated microalgae is subjected to microalgae-oil separation and refined into biodiesel; and the wastewater in the purified biogas slurry reaches the first B class standard required by a town sewage plant and can be used for agricultural irrigation or virescence. The treatment method is simple to operate and low in production cost, realizes biogas slurry purification and produces high-value microalgae cells simultaneously.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a biological treatment method for efficiently purifying biogas slurry by using microalgae, and belongs to the technical field of biological environmental protection. Background technique [0002] The biogas produced by anaerobic digestion of organic solid waste is a clean biomass energy, but the anaerobic digestion liquid is produced in a large amount. The annual biogas project in China produces more than 200 million tons of biogas liquid, and the anaerobic digestion liquid is post-treated. The problem has become one of the main bottlenecks restricting the development of the biogas industry. At present, anaerobic digestion liquid is usually used as agricultural fertilizer or discharged directly, and little consideration is given to whether the discharge meets the standards and the safety of agricultural use. In fact, biogas slurry after anaerobic digestion still contains a consid...

Claims

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Application Information

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IPC IPC(8): C02F3/32C10L1/02
CPCY02E50/10
Inventor 赵永军张跃进张慧葛志刚王娟徐劼赵国华孙诗清
Owner JIAXING UNIV
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