Method for recovering phosphorus from phosphorus-containing sludge by using glycine as phosphorus releasing agent

A technology of glycine and phosphorus-releasing agent, which is applied in the field of phosphorus recovery, can solve the problems of waste of carbon sources, surplus sludge, difficulty in releasing phosphorus from sludge, and high operating costs, and achieve material consumption saving, simple and easy technical means, and high dosage little effect

Inactive Publication Date: 2021-11-26
SOUTH CHINA UNIV OF TECH
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  • Claims
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Problems solved by technology

[0008] However, these traditional methods have problems such as difficulty in releasing phosphorus from sludge, insufficient phosphorus release, high energy consumption, and high operating costs.
[0009] For the method of adding carbon sources, it is necessary to continuously replenish carbon sources, and improper addition will easily lead to waste of carbon sources and excessive excess sludge

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  • Method for recovering phosphorus from phosphorus-containing sludge by using glycine as phosphorus releasing agent
  • Method for recovering phosphorus from phosphorus-containing sludge by using glycine as phosphorus releasing agent

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with specific embodiments.

[0037] A method of utilizing glycine as a phosphorus-releasing agent to reclaim phosphorus from phosphorus-containing sludge can be achieved through the following steps:

[0038] Put phosphorus-rich residual sludge mixture (MLSS=1.0g / L) into a closed reactor, add glycine to a final concentration of 10mg / L, 25mg / L and 50mg / L, and stir in a closed loop for 80min at a stirring speed of 100rpm. When the pH is 7.25, phosphorus-accumulating bacteria are induced to release phosphorus.

[0039] After the reaction is completed, let the mixed solution stand for 30 minutes, discharge the sludge that has settled at the bottom and completely release phosphorus, adjust the pH to 9.5 with 0.5mol / L sodium hydroxide, stir and mix for 60 minutes, and the phosphate in the phosphorus-rich supernatant will be combined. Calcium and magnesium ions in the supernatant undergo precipitati...

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Abstract

The invention discloses a method for recovering phosphorus from phosphorus-containing sludge by using glycine as a phosphorus releasing agent. The method comprises the following steps: adding exogenous glycine into phosphorus-rich excess sludge under an anaerobic condition, and exciting and realizing decomposition of polyphosphate and release of phosphate in sludge microbial cells under the condition of not consuming glycine, so as to obtain a phosphorus-released mixed solution; performing standing on the phosphorus-released mixed solution to realize solid-liquid separation; adjusting the pH value of the phosphorus-rich supernate obtained after solid-liquid separation or adding a precipitator to realize precipitation of phosphate so as to obtain a phosphate precipitate; after the phosphate precipitate is dried, obtaining a phosphorus recovery product; and recycling the glycine-containing supernate after phosphate recovery for next batch of sludge phosphate release. According to the method, the release rate of phosphate can be regulated and controlled by adjusting the concentration of glycine in the mixed solution, efficient, rapid and sufficient release of phosphorus can be ensured, and glycine in the solution is extremely low in consumption and can be recycled.

Description

technical field [0001] The invention relates to the fields of sludge resource utilization technology and phosphorus resource recovery, in particular to a method for recovering phosphorus from phosphorus-containing sludge by using glycine as a phosphorus-releasing agent. Background technique [0002] Phosphorus is an important pollutant in the water environment. As a nutrient for plants, its high concentration in the water body will stimulate the excessive growth of cyanobacteria / algae, cause cyanobacteria blooms, and endanger the ecological health of water and the safety of drinking water. [0003] As one of the key controlling factors of water eutrophication, the safety threshold of phosphorus in water is as low as 0.05-0.1mg / L, and phosphorus removal is one of the important tasks of urban sewage treatment. [0004] In addition, phosphorus is also an important non-renewable resource. The main use of phosphorus is to increase food production as a fertilizer. At present, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F1/52C02F1/66C02F101/10
CPCC02F11/04C02F1/52C02F1/66C02F2101/105
Inventor 邱光磊田煜程陈航
Owner SOUTH CHINA UNIV OF TECH
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