Synchronous recovery treatment method for nitrogen and phosphorus in high-solid-content anaerobic digestion sludge

An anaerobic digestion and recovery treatment technology, which is applied in the field of sludge recycling, can solve the problems of high ammonia nitrogen concentration, low phosphorus release efficiency, and the inability to effectively simultaneously realize the recovery of nitrogen and phosphorus in anaerobic digestion sludge, and achieve separation efficiency High, improved release efficiency, high release rate effect

Inactive Publication Date: 2020-12-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the contradiction between the low release efficiency of phosphorus in the anaerobic digestion process of sludge and the high concentration of ammonia nitrogen in the biogas slurry, which leads to the problem that the recovery of nitrogen and phosphorus in the anaerobic digestion sludge cannot be effectively realized synchronously. To provide a method for synchronous recovery and treatment of nitrogen and phosphorus in high-solids anaerobic digestion sludge, in order to realize the process effect of maximizing the recovery of sludge resources

Method used

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  • Synchronous recovery treatment method for nitrogen and phosphorus in high-solid-content anaerobic digestion sludge

Examples

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Effect test

Embodiment 1

[0039] Take high-solid anaerobic digested sludge with a solid content of 10%, a total phosphorus content of 28mg / g TS, and an ammonia nitrogen concentration of 2000mg / L in the biogas slurry. Add dilute sulfuric acid to the sludge, adjust pH=2, react for 0.5h, the release rate of phosphate in the sludge reaches 90%, carry out plate and frame pressure filtration on the acid-soluble product, the concentration of phosphate in the filter liquid is 2520mg / L. Take 100 ml of press filtrate, add 50 g of ion exchange resin, stir at 300 rpm for 30 min, and finally remove 80% of aluminum and iron in the filtrate. Finally, MgCl was added to the filtrate 2 ·6H 2 0, make the Mg:P molar ratio in the filtrate be 1.2~1.4, utilize plant ash to adjust pH to 9, stir 20min with 200rpm, stand and settle for 30min, the recovery rate of phosphate recorded in the supernatant reaches 90%, the removal rate of ammonia nitrogen to 57%.

Embodiment 2

[0041] Take high-solid anaerobic digested sludge with a solid content of 18%, a total phosphorus content of 20mg / g TS, and an ammonia nitrogen concentration of 2500mg / L in the biogas slurry. Adding concentration to the sludge is 2M dilute sulfuric acid, adjusting pH=2, reacting for 1h, the release rate of phosphate in the sludge reaches 80%, and performing plate and frame pressure filtration on the acid-soluble product, the concentration of phosphate in the filter liquid is 2880mg / L. Take 100 ml of press filtrate, add 90 g of ion exchange resin, stir at 300 rpm for 30 min, and finally remove 85% of aluminum and iron in the filtrate. Finally, MgCl was added to the filtrate 2 ·6H 2 0, make the Mg:P mol ratio in the filtrate be 1.2, utilize plant ash to adjust pH to 9, stir 20min with 200rpm, leave standstill precipitation 30min, supernatant liquid records the rate of recovery of phosphate to reach 92%, and the removal rate of ammonia nitrogen reaches 63%. %.

Embodiment 3

[0043] Take high-solid anaerobic digested sludge with a solid content of 15%, a total phosphorus content of 25mg / g TS, and an ammonia nitrogen concentration of 2300mg / L in the biogas slurry. Add concentration of 2M dilute sulfuric acid to the sludge, adjust pH=2, react for 1h, the release rate of phosphate in the sludge reaches 85%, carry out plate and frame pressure filtration on the acid-soluble product, and the concentration of phosphate in the filter liquid is 3000mg / L. Take 100 ml of press filtrate, add 75 g of ion exchange resin, stir at 300 rpm for 30 min, and finally 86% of aluminum and iron in the filtrate are removed. Finally, MgCl was added to the filtrate 2 ·6H 2 0, make the Mg:P mol ratio in the filtrate be 1.4, utilize plant ash to adjust pH to 9, stir 20min with 200rpm, leave standstill to precipitate 30min, the rate of recovery of phosphate recorded in the supernatant reaches 95%, and the removal rate of ammonia nitrogen reaches 65%. %.

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Abstract

The invention discloses a synchronous recovery treatment method for nitrogen and phosphorus in high-solid-content anaerobic digested sludge, which comprises the following steps of: (1) carrying out acid dissolution on anaerobic digested sludge to obtain an acid-soluble product; (2) carrying out solid-liquid separation on the acid-soluble product obtained in the step (1) to obtain a mud cake and press filtrate; (3) adding cation exchange resin into the press filtrate obtained in the step (2), removing metal impurities, and filtering to obtain filtrate; and (4) adding magnesium salt into the filtrate obtained in the step (3), and adjusting the pH value to form struvite precipitate for recovery. According to the method, phosphorus in the anaerobic digestion sludge is released into the biogasslurry through acid dissolution, then impurities are removed, and finally struvite crystals are formed by utilizing wastes, so that efficient recovery of nitrogen and phosphorus in the anaerobic digestion sludge is synchronously realized.

Description

technical field [0001] The invention belongs to the technical field of sludge resource utilization, and in particular relates to a method for synchronous recovery and treatment of nitrogen and phosphorus in high-solid anaerobic digestion sludge. Background technique [0002] Phosphorus is one of the essential nutrients for all living things. Due to its limited and non-renewable nature, phosphorus resource recovery has become a strategic requirement for global sustainable development. About 1.3 million tons of phosphorus enter the sewage treatment plant through sewage every year in the world, which is equivalent to 15%-20% of the global phosphorus demand. In order to prevent eutrophication, more than 90% of the phosphorus in the final sewage is transferred to the sludge, so the sludge becomes an important source of phosphorus recovery. [0003] Considering the pollution properties of sludge, phosphorus-rich sludge cannot be used directly as phosphate fertilizer. Generally, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/122C02F9/04C02F101/16C02F101/10
CPCC02F1/42C02F1/5245C02F11/004C02F11/12C02F2001/425C02F2101/105C02F2101/16
Inventor 戴晓虎丁燕燕华煜杨东海于鸿宇
Owner TONGJI UNIV
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