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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

Active Publication Date: 2020-07-21
GUANGXI UNIV
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  • Abstract
  • Description
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AI Technical Summary

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

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Embodiment 1

[0030] Embodiment 1: waste paper pulping wastewater treatment

[0031] 1) The initial ash content of anaerobic granular sludge is 0.64 g / gTS;

[0032] 2) The typical wastewater quality of waste paper pulping is COD 1500-5000 mg / L, 300-1200 mg / L, total phosphorus 0.5-2 mg / L, pH value 6.2-7.5;

[0033] 3) Since the pH value of the wastewater is close to the suitable pH range of anaerobic, the composite decalcifying agent for calcified anaerobic granular sludge must 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;

[0034] 4) According to the actual calcium ion concentration of wastewater, calculate the dosage of composite decalcifier 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 anaerobic reactor;

[003...

Embodiment 2

[0038] Embodiment 2: landfill leachate treatment

[0039] 1) The initial ash content of anaerobic granular sludge is 0.55 g / gTS;

[0040] 2) Typical waste water quality of landfill leachate is COD 5000-20000 mg / L, 250-800 mg / L, total phosphorus 5-25 mg / L, ammonia nitrogen 400-1600 mg / L, pH value 8.0-8.5;

[0041] 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;

[0042] 4) According to the actual calcium ion concentration of the wastewater, calculate the dosage of the compound decalcifying agent per ton of water according to the mass ratio of calcium...

Embodiment 3

[0046] Embodiment 3: fermentation wastewater treatment

[0047] 1) The initial ash content of anaerobic granular sludge is 0.43 g / gTS;

[0048] 2) The typical wastewater quality of fermentation wastewater is COD 18000-40000 mg / L, 250-1000 mg / L, total phosphorus 15-45 mg / L, ammonia nitrogen 13000-16000 mg / L, pH value 2.2-2.6;

[0049] 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;

[0050] 4) According to the actual calcium ion concentration of the wastewater, calculate the dosage of the compound decalcifying agent per ton of water according to the mass ratio of calcium and phosphorus of 10-25:1, and add it to the inlet pool of the anaerobic reactor;

[0051] ...

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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 10‑25:1, 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.

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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Application Information

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Patent Type & Authority Patents(China)
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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