Composite decalcification agent and decalcification regeneration process for calcified anaerobic granular sludge

A technology of anaerobic granular sludge and composite decalcifier, which is applied in biological sludge treatment, anaerobic digestion treatment, water/sludge/sewage treatment, etc., can solve the problem of reducing the content of inorganic components in anaerobic granular sludge, Granular sludge calcification and other problems, to achieve the effect of changing the form of calcium scale deposition, simple operation, and low cost
CN110482695BActive Publication Date: 2020-07-21GUANGXI UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGXI UNIV
Publication Date
2020-07-21

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Abstract

The invention discloses a composite decalcification agent for calcified anaerobic granular sludge and a decalcification regeneration process. The components of the composite decalcification agent include, in parts by mass, 40-85 parts of phosphoric acid and 10-25 parts of sodium tripolyphosphate 1-10 parts of sodium lignosulfonate. By adding a composite decalcifier to the anaerobic granular sludge treatment system of high-calcium wastewater with a calcium-phosphorus mass ratio of 10โ€‘25:1, the formation of granular sludge by free calcium ions is inhibited. Internal calcium deposition, promote calcium deposition to form chelate and return to the wastewater phase, and then realize decalcification regeneration of calcified anaerobic granular sludge. The present invention effectively solves problems in the fields of waste paper pulping, food processing, landfill leachate, fermentation wastewater, etc. In the treatment of high-calcium wastewater, the problem of reducing the treatment capacity of the anaerobic reaction system due to sludge calcification and inactivation has significant application value.
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Description

technical field

[0001] The invention belongs to the field of industrial water treatment, in particular to a composite decalcification agent for calcified anaerobic granular sludge and a decalcification regeneration process. Background technique

[0002] Anaerobic biological treatment technology is suitable for the treatment of high-concentration organic wastewater. Among them, anaerobic granular sludge technology is widely used in pulp and paper making, monosodium glutamate, soybean / dairy product wastewater, landfill leachate and other fields. Practice has shown over the years that calcium ions ( ) content in the anaerobic granular sludge will lead to the accumulation of inorganic components such as calcium carbonate and hydroxyapatite in the anaerobic granular sludge, resulting in a decrease in the total effective microbial biomass in the anaerobic reactor and triggering the collapse of the anaerobic system. The above phenomenon is called "granular sludge calcification". ...

Claims

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