Device and method for recovering nitrogen and phosphorus in sewage by aeration disturbance type induced crystallization

A technology of induced crystallization and aeration device, which is applied in the direction of crystallization separation, oscillating crystallization, solution crystallization, etc., can solve the problems of inability to remove nitrogen elements, poor separation effect of crystal seeds, and high water content of products, so as to achieve high purity of recovered products, The effect of small footprint and energy consumption, high purity

Inactive Publication Date: 2020-06-09
JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

HAP crystallization has a wide range of applications to recover phosphorus in sewage, and can treat phosphorus-containing wastewater of different concentrations, but cannot remove nitrogen in sewage
[0004] At present, the main nitrogen and phosphorus crystallization reactors include DHV crystallization reactor, CSIR fluidized bed crystallization column and Kurita fixed bed crystallization column, etc., but there are generally disadvantages such as low crystallization efficiency, high product water content and poor seed separation effect.

Method used

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  • Device and method for recovering nitrogen and phosphorus in sewage by aeration disturbance type induced crystallization
  • Device and method for recovering nitrogen and phosphorus in sewage by aeration disturbance type induced crystallization
  • Device and method for recovering nitrogen and phosphorus in sewage by aeration disturbance type induced crystallization

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Experimental program
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Effect test

Embodiment 1

[0060] Embodiment 1, for only phosphorus-containing laboratory configuration sewage treatment:

[0061] Using a single phosphorus-containing sewage with a concentration of 20mg / L in the laboratory, the efficiency of phosphorus recovery based on the induced HAP crystallization method of the invented device and method was studied. The initial pH of phosphorus-containing sewage is 6.95, and the alkalinity is ~65.20mg / L. The height of the reaction chamber of the aeration disturbance type induced crystallization reactor 2 is 20cm, the inner diameter is 10cm, the total volume is about 1.5L, the effective volume is 1.2L, the water inflow is 1.6L / h, the hydraulic retention time is 45min, and the quartz sand is used as The amount of induced crystallization seed crystal 211 is 30g / L, and the aeration rate of the aeration device 29 is 2.0L / min. During the reaction process, according to the Ca:P molar ratio of 2:1, CaCl is pumped in from the calcium ion reagent pool 31 2 solution. Expe...

Embodiment 2

[0062] Embodiment 2, for the sewage treatment plant sewage containing phosphorus and nitrogen simultaneously, only carry out phosphorus removal treatment:

[0063] Take the anaerobic tank mixed solution from the sewage treatment plant, and take the supernatant after precipitation to induce crystallization reaction. The water quality characteristics are as follows: PO 4 3- -P~21.20mg / L; NH 4 + -N~38.45mg / L; COD~78.65mg / L; pH~7.23; alkalinity~321.23mg / L; About 1.5L, the effective volume is 1.2L, the water intake is 1.6L / h, the hydraulic retention time is 45min, the quartz sand is used as the induced crystallization seed 211, the addition amount is 40g / L, and the aeration rate of the aeration device 29 is 2.5L / min . During the reaction process, according to the Ca:P molar ratio of 2.5:1, CaCl is pumped in from the calcium ion reagent pool 31 2 solution. Experimental results: The concentration of phosphorus in the effluent of the device is below 0.5mg / L, and the recovery rat...

Embodiment 3

[0064] Embodiment 3, for the laboratory configuration sewage containing phosphorus and nitrogen simultaneously, carry out phosphorus removal and nitrogen removal treatment simultaneously:

[0065] The laboratory is equipped with sewage containing nitrogen and phosphorus at the same time. The concentration of nitrogen and phosphorus is 60mg / L, the initial pH of sewage is 7.12, and the alkalinity is ~86.35mg / L; , the inner diameter is 10cm, the total volume is about 1.5L, the effective volume is 1.2L, the water intake is 1.6L / h, the hydraulic retention time is 45min, the quartz sand is used as the induced crystallization seed 211, the addition amount is 30g / L, and the aeration device 29 is aerated Gas rate 2.0L / min. During the reaction, MgCl is pumped from the magnesium ion reagent pool 32 according to the Mg:N:P molar ratio of 1:1:1. 2 solution. Experimental results: the concentration of nitrogen and phosphorus in the effluent of the device are respectively below 8.0mg / L and ...

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Abstract

The invention discloses a device and a method for recovering nitrogen and phosphorus in sewage by aeration disturbance type induced crystallization. The device for recovering nitrogen and phosphorus in sewage by aeration disturbance type induced crystallization comprises a sewage tank, an aeration disturbance type induced crystallization reactor and an agent tank, wherein the sewage tank and the agent tank are respectively communicated with the aeration disturbance type induced crystallization reactor. The method for recovering nitrogen and phosphorus in sewage by adopting aeration disturbancetype induced crystallization mainly comprises four steps of equipment connection, reactant pumping, aeration reaction and separation and recovery, and can realize removal and recovery of nitrogen andphosphorus resources in sewage. An induced crystallization mode is adopted, the product recovery efficiency is high, the purity is high, and seed crystals are easy to separate and recover; quartz sand is used as an induced crystallization seed crystal, is cheap, and can be directly applied to agriculture together with a recovered product to be used as a slow-release fertilizer for crops; and water eutrophication is avoided, cyclic utilization of resources can be achieved, and economic and environmental benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an aeration disturbance-type induced crystallization device and method for recovering nitrogen and phosphorus in sewage. Background technique [0002] Nitrogen and phosphorus are the main elements of water eutrophication, but they are also valuable resources. With the growth of world population and the rapid development of industrial and agricultural production, people's demand for nitrogen and phosphorus is increasing day by day. The sewage contains "richer" nitrogen and phosphorus, which has great recovery potential. If the nitrogen and phosphorus in the sewage are recovered, not only can the eutrophication of the water body be avoided, but also the recycling of resources can be realized, which has both economic and environmental benefits. [0003] There are many recovery methods for nitrogen and phosphorus, such as adsorption, chemical precipitation, induced crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52B01D9/00B01D9/02C01B25/32C01B25/45C02F101/16
CPCB01D9/0036B01D9/0081C01B25/32C01B25/451C02F1/52C02F1/5236C02F2001/5218C02F2101/105C02F2101/16
Inventor 代洪亮廖志民周荣忠陈勇陶涛谢锦文代振鹏易佳璐胡姣姣刘玉娇程音弘
Owner JIANGXI JDL ENVIRONMENTAL PROTECTION CO LTD
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