Method for recycling and reducing blue algae by low-temperature heat and free ammonia combined treatment

A technology of free ammonia and low-temperature heat, applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve problems such as low efficiency, achieve good results, low heat energy consumption, and improve biodegradability

Inactive Publication Date: 2020-03-06
HUNAN UNIV
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Problems solved by technology

This method is mainly based on low-temperature heat combined with free ammonia treatment technology, and finally anaerobic digestion is performed to produce methane to solve the current situation of low efficiency of anaerobic digestion of remaining cyanobacteria to produce methane

Method used

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Examples

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Embodiment 1

[0019] A method for recycling and reducing cyanobacteria by using low-temperature heat combined with free ammonia, which is carried out as follows: the salvaged and collected cyanobacteria are concentrated and precipitated for 3 days to a total solid content of 30000mg / L; then transferred to a pretreatment reaction tank , add ammonium chloride stock solution so that the concentration of ammonium nitrogen in the reaction tank is 300mg / L, stir at 200rpm and adjust the initial pH in the reaction tank to 9.0; then heat the cyanobacteria in the tank, and control the temperature in the tank at 60°C; The residence time of cyanobacteria is 12 hours; after cooling the pretreated cyanobacteria mixture to 35°C, add industrial hydrochloric acid waste liquid to adjust the pH of the mixture to 7.0±0.2, and then blow off nitrogen for 3 minutes; The sludge mixture was transferred to the anaerobic digestion tank. During the digestion process, the temperature was controlled at 35°C, the stirring...

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Abstract

The invention provides a method for recycling and reducing blue algae by low-temperature heat and free ammonia combined treatment, and belongs to the fields of alga reduction recycling treatment and disposal. A low-temperature heat and free ammonia combined treatment technology is mainly adopted, and finally, anaerobic digestion is performed to produce methane; the rupture of blue algae extracellular polymers and cell walls and the release of intracellular organic matters are effectively promoted, the biodegradability of soluble organic matters is improved, the accumulation of algal toxins isreduced, richer and available organic substrates are provided for subsequent anaerobic digestion, the retention time is shortened while the methane yield of anaerobic digestion of blue algae is increased, and the organic matters in the algae are transferred from a solid phase to a liquid phase and finally converted into methane, so that the algae reduction is realized.

Description

technical field [0001] The invention relates to the field of algae recycling, reduction treatment and disposal, and specifically refers to a method for recycling and reducing algae by using low-temperature heat combined with free ammonia. Background technique [0002] In recent years, with the rapid development of industry and agriculture in my country, a large amount of nitrogen, phosphorus and other nutrient salts have been discharged into the lake, causing the eutrophication of the lake to intensify, causing algae, especially blue-green algae to flood the lake, and large-scale outbreaks of algal blooms, which not only affect the safety of urban water supply , and seriously damaged the ecological environment of the water body. In order to remove the cyanobacteria flooding in the lakes, a series of technical measures such as salvage, flocculation and biological algae control have been adopted in various places. These methods have effectively suppressed further outbreaks of a...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F11/00
CPCC02F11/00C02F11/04C02F2103/007
Inventor 刘旭冉王冬波都明婷伍艳馨杨静楠
Owner HUNAN UNIV
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