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Composite phosphorus-based calcification inhibitor for inhibiting anaerobic granular sludge calcification and application method

An anaerobic granular sludge, composite phosphorus-based technology, applied in anaerobic digestion treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve problems such as calcification of granular sludge, and achieve simple and practical operation Strong, low-cost effect

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

[0004] The purpose of the present invention is to solve the problem of granular sludge calcification caused by microorganism-induced calcium carbonate deposition, and provide a composite phosphorus-based calcification inhibitor for blocking anaerobic granular sludge calcification and its application method. The method is simple to operate, low in cost and practical Strong, can effectively block the calcification process of anaerobic granular sludge core in the process of anaerobic treatment of high calcium wastewater

Method used

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  • Composite phosphorus-based calcification inhibitor for inhibiting anaerobic granular sludge calcification and application method
  • Composite phosphorus-based calcification inhibitor for inhibiting anaerobic granular sludge calcification and application method
  • Composite phosphorus-based calcification inhibitor for inhibiting anaerobic granular sludge calcification and application method

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Embodiment 1

[0026] Embodiment 1: waste paper pulping wastewater treatment

[0027] 1) 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;

[0028] 2) Since the pH value of the wastewater is close to the suitable anaerobic pH value range, the compound phosphorus-based calcification inhibitor for blocking the calcification of anaerobic granular sludge in high-calcium wastewater needs to be close to neutral. The formula shown is as follows: 65 parts of phosphoric acid, 20 parts of sodium tripolyphosphate and 15 parts of sodium pyrophosphate were dissolved in water and mixed uniformly to obtain a 10wt% aqueous solution to obtain a composite phosphorus-based calcification inhibitor;

[0029] 3) According to the actual calcium ion concentration of the wastewater, calculate the dosage of the compound phosphorus-based calcification inhibitor per ton of water according to the calcium-phosphorus mass ratio o...

Embodiment 2

[0034] Embodiment 2: landfill leachate treatment

[0035] 1) 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;

[0036] 2) 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 compound phosphorus-based calcification inhibitor that blocks the calcification of anaerobic granular sludge in high-calcium wastewater needs to be acidic , the formula shown is as follows: 85 parts of phosphoric acid, 10 parts of sodium tripolyphosphate, 5 parts of sodium pyrophosphate, dissolved in water and mixed uniformly to obtain a 10wt% aqueous solution to obtain a composite phosphorus-based calcification inhibitor;

[0037] 3) According to the actual calcium ion concentration of the wastewater, calculate the dosage of the compound phosphorus-based calcification ...

Embodiment 3

[0041] Embodiment 3: fermentation wastewater treatment

[0042] 1) 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;

[0043] 2) Since the pH value of the wastewater is acidic, the compound phosphorus-based calcification inhibitor that blocks the calcification of anaerobic granular sludge in high-calcium wastewater needs to be slightly alkaline. The formula shown is as follows: 40 parts of phosphoric acid, 25 parts of sodium tripolyphosphate 25 parts, sodium pyrophosphate, add water to dissolve and mix uniformly to obtain 10wt% aqueous solution, and make a composite phosphorus-based calcification inhibitor;

[0044] 3) According to the actual calcium ion concentration of the wastewater, calculate the dosage of the compound phosphorus-based calcification inhibitor per ton of water according to the mass calcium-phosphorus ratio of 25-35:1, and add...

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Abstract

The invention discloses a composite phosphorus-based calcification inhibitor for inhibiting anaerobic granular sludge calcification and an application method, and relates to the field of industrial wastewater treatment. The calcification inhibitor is prepared from, by mass, 40-85 parts of phosphoric acid, 10-25 parts of sodium tripolyphosphate and 5-25 parts of sodium pyrophosphate. The calcification inhibitor is added into inlet water of an anaerobic reactor according to a calcium-phosphorus ratio (mass ratio) of (20-35):1 in a high-calcium-content wastewater anaerobic granular sludge treatment system, so that free calcium ions are inhibited from forming calcium deposition in granular sludge, and the activity of the anaerobic granular sludge is maintained. Calcium is actively prevented from being deposited and calcified and inactivated in a sludge core, the anaerobic reactor does not need to discharge sludge or scale removal, the problem that the treatment capacity of an anaerobic reaction system is reduced due to sludge calcification and inactivation in high-calcium-content wastewater treatment in the fields of waste paper pulping, food processing, landfill leachate, fermentationwastewater and the like is effectively solved, and the composite phosphorus-based calcification inhibitor and the method have remarkable application value.

Description

technical field [0001] The invention belongs to the field of industrial water treatment, in particular to a compound phosphorus-based calcification inhibitor for blocking anaerobic granular sludge calcification and an application method thereof. 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". [0...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F3/34C02F103/28C02F103/06C02F101/16
CPCC02F3/28C02F3/34C02F2303/22C02F2209/06C02F2103/28C02F2103/06C02F2209/08C02F2209/14C02F2101/16C02F2209/001C02F2209/055C02F5/086C02F1/66C02F2103/32
Inventor 张健王双飞王志伟潘积琦盘远方吴宛励
Owner GUANGXI UNIV
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