Device and method for recycling phosphorus by virtue of induced crystallization

A technology of induced crystallization and seed crystals, which is applied in the fields of environmental protection and resource recycling, can solve problems such as difficult resource reuse, difficult regeneration, and limited adsorption capacity of adsorbent materials, so as to improve the effect of solid-liquid separation and reduce the use of chemicals The effect of increasing the amount and enhancing the phosphorus recovery effect

Inactive Publication Date: 2015-10-14
ANHUI SCI & TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The chemical precipitation methods mainly include calcium salt, iron salt, aluminum salt, magnesium ammonium phosphate (MAP) precipitation method and hydroxyl calcium phosphate (HAP) precipitation method. The disadvantage of this method is that the recovered product has poor quality, high moisture content and cannot be directly applied to actual production
In addition, sediment dewatering equipment is required, which increases operating costs
[0006] (2) Biological phosphorus removal method: This method enriches the phosphorus in the sewage in the form of phosphorus accumulation in the phosphorus removal microbial cells, and then recovers phosphorus in the form of sedimentation sludge. The disadvantage of this method is that the moisture content of the sedimentation sludge is High, and...

Method used

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  • Device and method for recycling phosphorus by virtue of induced crystallization
  • Device and method for recycling phosphorus by virtue of induced crystallization
  • Device and method for recycling phosphorus by virtue of induced crystallization

Examples

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example 1

[0062] The induced crystallization reactor was used to recover phosphorus from the phosphorus-containing sewage configured in the laboratory. The height of the induced crystallization reactor is 30cm, the inner diameter is 16cm, the total volume is 6L, the effective volume is 5L, the effective volume of solid-liquid separation is 1.5L, the treated water volume is 1.67L / h, the hydraulic retention time is 3h, and the sewage comes from the laboratory configuration. For phosphorus-containing wastewater, add 43.9mg of potassium dihydrogen phosphate per liter of water, and its phosphorus concentration is 10mg / L.

[0063] Take 600L of phosphorus-containing wastewater, add 3g of calcite seed crystals, adjust the pH to 8.8 with NaOH solution, and add CaCl at a Ca:P molar ratio of 2:1. 2 solution, the flow rate is 0.5L / h, and the aeration rate is 1.5L / min. The effluent was monitored continuously for 15 days, and the concentration of phosphorus in the effluent was measured every...

example 2

[0066] The induced crystallization reactor is used to recover phosphorus from urban domestic sewage. Take 1.2m of domestic sewage at the water inlet of a sewage treatment plant 3 , the treatment water volume is 3.30L / h, the hydraulic retention time is 3h, and 5g of calcite seeds are added, and the pH is adjusted to 8.8 with NaOH solution, and CaCl is added according to the Ca:P molar ratio of 2:1. 2 solution, the flow rate is 0.5L / h, and the aeration rate is 1.5L / min. Continuously monitor the influent and effluent for 15 days, and measure the concentration of phosphorus in the influent and effluent every day. See the test results image 3 .

[0067] According to the experimental results, the phosphorus concentration in the influent water is 6.2-8.3mg / L, the recovery rate of phosphorus in the sewage by the induced crystallization reactor is above 93%, and the phosphorus concentration in the effluent water is below 0.5mg / L, which meets the requirements of "GB18918-20...

example 3

[0069] The induced crystallization reactor is used to recover phosphorus from aquaculture wastewater. Take 0.3m of breeding wastewater at the outlet of a pig farm 3 , the treatment water volume is 0.85L / h, the hydraulic retention time is 3h, and 2g of calcite seeds are added, and the pH is adjusted to 8.8 with NaOH solution, and CaCl is added according to the Ca:P molar ratio of 2:1. 2 solution, the flow rate is 0.5L / h, and the aeration rate is 1.5L / min. Continuously monitor the influent and effluent for 15 days, and measure the concentration of phosphorus in the influent and effluent every day. See the test results image 3 .

[0070] According to the experimental results, the phosphorus concentration in the influent water is 38.8-45.9mg / L, the phosphorus recovery rate of the induced crystallization reactor in the sewage is above 83%, and the phosphorus concentration in the effluent water is below 8.0mg / L, which meets the requirements of "GB18596-2001 Livestock an...

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Abstract

The invention relates to environmental protection and resource recycling techniques and devices and particularly relates to an induced crystallization reactor, a solid-liquid separation device and a method for efficiently recycling phosphorus from sewage. The induced crystallization reactor and the solid-liquid separation device comprise an water inlet part, a medicating part, an acidity regulating part, an aeration stirring part, an induced crystallization reaction part, a solid-liquid separation part and a crystal recycling part, wherein the induced crystallization reactor is communicated with the solid-liquid separation device to adequately play seed crystal induction function. According to the device and the method, calcite is utilized as a seed crystal for inducing phosphorus in sewage so as to recycle phosphorus in a form of hydroxyl calcium phosphate crystals, and the recycled product can be directly applied to industrial and agricultural production, so that the sewage treatment, the environmental protection and the resource reutilization are organically combined. Besides, the method has the characteristics of small occupied area, high recycling efficiency, good quality of the recycled product, little equipment investment and convenient operation.

Description

technical field [0001] The invention relates to environmental protection and resource recycling technologies and devices, in particular to an induced crystallization reactor, a solid-liquid separation device and a method for efficiently recovering phosphorus from sewage. Background technique [0002] Nitrogen and phosphorus are important factors leading to eutrophication of water bodies. According to Liebig's law of minimum factors, phosphorus is the key factor leading to eutrophication of water bodies (C 106 h 263 o 110 N 16 P) is a limiting factor for growth, and many countries have strict restrictions on its emission concentration. When the concentration of phosphorus in the water body reaches 0.015mg / L, it will cause rapid growth of algae, and every 1g of phosphorus discharged into the water body will lead to the growth of 950g (dry weight) of algae. The direct consequence of the rapid growth of algae is to accelerate the aging process of the water body, making the w...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F101/10
Inventor 邹海明
Owner ANHUI SCI & TECH UNIV
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