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

A technology of anaerobic granular sludge and composite decalcifying agent, applied in biological sludge treatment, anaerobic digestion treatment, water/sludge/sewage treatment, etc., can solve granular sludge calcification and reduce anaerobic granular sludge Inorganic component content and other issues, to achieve simple operation, ensure long-term stable and efficient treatment, and avoid adverse effects

Active Publication Date: 2019-11-22
GUANGXI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of calcification of granular sludge caused by microorganism-induced calcium carbonate deposition, and provide a composite decalcification agent and decalcification regeneration process for calcified anaerobic granular sludge. The method is simple in operation, low in cost and strong in practicability. It can realize the decalcification regeneration of calcified anaerobic granular sludge during the operation of the anaerobic reactor, reduce the content of inorganic components in the anaerobic granular sludge, and effectively block the anaerobic particles in the process of anaerobic treatment of high-calcium wastewater Calcification process of sludge core

Method used

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  • Composite decalcifying agent for calcified anaerobic granular sludge and decalcifying regeneration process

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Embodiment 1

[0033] Embodiment 1: waste paper pulping wastewater treatment

[0034] 1) The initial ash content of anaerobic granular sludge is 0.64g / gTS;

[0035] 2) The typical wastewater quality of waste paper pulping is COD 1500-5000mg / L, Ca 2+ 300-1200mg / L, total phosphorus 0.5-2mg / L, pH value 6.2-7.5;

[0036] 3) Since the pH value of the wastewater is close to the suitable range of anaerobic pH value, the composite decalcifying agent for calcified anaerobic granular sludge needs to be close to neutral. The formula shown is as follows: 65 parts of phosphoric acid, 25 parts of sodium tripolyphosphate, lignin 10 parts of sodium sulfonate, dissolved in water and mixed uniformly to obtain a composite decalcifying agent;

[0037] 4) According to the actual calcium ion concentration of the wastewater, calculate the dosage of the composite decalcifying agent per ton of water according to the mass ratio of calcium to phosphorus of 10-25:1, and add it to the influent adjustment tank of the a...

Embodiment 2

[0041] Embodiment 2: landfill leachate treatment

[0042] 1) The initial ash content of anaerobic granular sludge is 0.55g / gTS;

[0043] 2) Typical waste water quality of landfill leachate is COD 5000-20000mg / L, Ca 2+ 250-800mg / L, total phosphorus 5-25mg / L, ammonia nitrogen 400-1600mg / L, pH value 8.0-8.5;

[0044] 3) Since the pH value of the wastewater is alkaline and the concentration of ammonia nitrogen is high, free ammonia will be inhibited under alkaline conditions. Therefore, the composite decalcifying agent for calcified anaerobic granular sludge needs to be acidic. The formula shown is as follows: 85 parts of phosphoric acid , 10 parts of sodium tripolyphosphate, 5 parts of sodium lignosulfonate, dissolved in water and mixed uniformly to obtain a composite decalcifying agent;

[0045] 4) According to the actual calcium ion concentration of the wastewater, calculate the dosage of the composite decalcifying agent per ton of water according to the mass ratio of calcium...

Embodiment 3

[0049] Embodiment 3: fermentation wastewater treatment

[0050] 1) The initial ash content of anaerobic granular sludge is 0.43g / gTS;

[0051] 2) The typical wastewater quality of fermentation wastewater is COD 18000-40000mg / L, Ca 2+ 250-1000mg / L, total phosphorus 15-45mg / L, ammonia nitrogen 13000-16000mg / L, pH value 2.2-2.6;

[0052] 3) Since the pH value of the wastewater is acidic, the composite decalcifying agent for calcified anaerobic granular sludge needs to be alkaline, and the formula shown is as follows: 40 parts of phosphoric acid, 15 parts of sodium tripolyphosphate, and 1 part of sodium lignosulfonate , add water to dissolve and mix evenly to obtain a composite decalcifying agent;

[0053] 4) According to the actual calcium ion concentration of the wastewater, calculate the dosage of the composite decalcifying agent per ton of water according to the mass ratio of calcium to phosphorus of 10-25:1, and add it to the inlet pool of the anaerobic reactor;

[0054] 5...

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Abstract

The invention discloses a composite decalcifying agent for calcified anaerobic granular sludge and a decalcifying regeneration process. The composite decalcifying agent comprises the following components in parts by mass: 40-85 parts of phosphoric acid, 10-25 parts of sodium tripolyphosphate and 1-10 parts of sodium lignin sulfonate. The composite decalcifying agent is added into inlet water of ananaerobic reactor according to the calcium-phosphorus mass ratio of (10-25):1 in a high-calcium-content wastewater anaerobic granular sludge treatment system, so that free calcium ions are inhibitedfrom forming calcium deposition in granular sludge, calcium deposition is promoted to form chelate to return to a wastewater phase, and then decalcification regeneration of the calcified anaerobic granular sludge is realized. According to the composite decalcifying agent and the process, deposition of calcium in the sludge core is actively prevented, and chelation and dissolution of calcium deposition are enhanced, so that the anaerobic reactor does not need sludge discharge or descaling, the problem that the treatment capacity of an anaerobic reaction system is reduced due to sludge calcification inactivation in high-calcium-content wastewater treatment in the fields of waste paper pulping, food processing, landfill leachate, fermentation wastewater and the like is effectively solved, andthe composite decalcifying agent and the process have remarkable application value.

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, monosodium glutamate, soybean / dairy product wastewater, landfill leachate and other fields. Practice has shown over the years that calcium ions (Ca 2+ ) content is high, it 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 causing the collapse of the anaerobic system. The above phenomenon is called "granular sludge calcification". [0003] The existing gran...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F3/34C02F103/28C02F103/06C02F101/16
CPCC02F3/28C02F3/34C02F2103/28C02F2103/06C02F2101/16C02F2303/22C02F2209/08C02F2209/06C02F2209/14C02F2103/32C02F2209/003C02F2101/10C02F11/04
Inventor 张健王双飞王志伟盘远方潘积琦吴宛励
Owner GUANGXI UNIV
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