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A kind of preparation and application method of phosphorus removal agent

A technology of chemicals and influent total phosphorus, which is applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc. Water quality compliance and other issues, to achieve the effect of improving sludge settling performance, efficient phosphorus removal, and extreme sludge production

Active Publication Date: 2021-07-09
GUANGDONG PROVINCIAL ACADEMY OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention uses iron salts and aluminum salts as phosphorus removal agents, which can achieve good results for sewage treatment with high influent total phosphorus content, but the effect is not good for sewage with low influent total phosphorus content. Dosing will lead to a large amount of chemical sludge, which will seriously affect the water quality standard, and the dosage of phosphorus removal agent is large, and the cost is high

Method used

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  • A kind of preparation and application method of phosphorus removal agent
  • A kind of preparation and application method of phosphorus removal agent
  • A kind of preparation and application method of phosphorus removal agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation and use of embodiment 1 phosphorus removal agent

[0022] With a processing scale of 80000m 3 / d, use the sewage treatment plant of CASS technology as the implementation object, and carry out productive experiments. The CASS process flow is as follows: the sewage enters the aeration grit chamber after being pretreated by the thick and fine grids, and the effluent from the grit chamber enters the biochemical reaction pool. The CASS tank is the experimental group), using a six-cycle operation process, in which water intake is 1 hour, reaction is 1 hour (aeration starts after 0.5 hours of water intake, and the actual aeration reaction takes 1.5 hours), precipitation is 1 hour, and decanting water (D) = 1 hour . The sediment effluent from the CASS biochemical pool is finally discharged after ultraviolet disinfection.

[0023] The test began on June 15 and ended on July 8. Iron powder with a micron mesh of 400 mesh and aluminum powder with a micron mesh of 400...

Embodiment 2

[0027] The effect of embodiment 2 dephosphorization agent

[0028] Every two days, get raw water and embodiment 1, comparative example 1, comparative example 2, the total phosphorus content of the effluent after comparative example 3 treatment compares, and total phosphorus content ammonium molybdate spectrophotometry is measured, and concrete data is shown in Table 1; The total nitrogen content of the effluent in Example 1 is compared with the total nitrogen content of the effluent of the comparative example 3 system, and the specific data are shown in Table 2; table 3.

[0029] Table 1

[0030]

[0031] Table 2

[0032]

[0033] table 3

[0034]

[0035]

[0036]As can be seen from Table 1, for sewage with low influent total phosphorus concentration, the phosphorus removal effect of Example 1 is obviously better or stable than that of Comparative Examples 1-3, and Comparative Example 3 only relies on biological phosphorus removal, and the phosphorus removal ef...

Embodiment 3

[0037] The long-term use effect of embodiment 3 dephosphorization agent

[0038] Similarly, the sewage treatment plant in Example 1 is used as the treatment object to carry out production and application. From June 2015 to April 2016, add 20 tons of this patent dephosphorization agent (micron order number is 400 mesh iron powder) in total, The total treated water volume is 4.0058 million tons, and the average dosage concentration is about 5mg / L. When the influent total phosphorus concentration is about 2mg / L, the effluent average total phosphorus concentration has been between 0.3-0.5mg / L for a long time, achieving stability Up to the standard, the drug cost is about 0.03 yuan / m 3 , which is only 1 / 2 of the cost of conventional metal salt agents. Since this product has a long-lasting phosphorus removal effect, long-term use of the product of the present invention can effectively reduce the cost of agents.

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Abstract

The invention provides a novel phosphorus removal agent and its use method. The phosphorus removal agent is composed of pure iron powder and aluminum powder. The weight ratio of iron powder and aluminum powder is: 10‑1:5‑1, iron powder and aluminum powder The particle size of the powder is in the order of microns, and the mesh number is above 300 mesh. The method of using the phosphorus removal agent is to adopt the method of dry injection, and use the screw feeder to directly add the phosphorus removal agent to the aerobic pool at multiple points, and the dosage is 5-15 mg per liter of sewage. The aerobic tank can be an obligate aerobic tank or the aeration section of the sequence batch activated sludge process, and it can also be directly thrown into the biochemical tank for the oxidation ditch process regardless of time period or division. The dissolved oxygen in the section and the biochemical tank is greater than 2 mg / L. The phosphorus removal agent of the present invention realizes the efficient phosphorus removal of sewage, and helps to improve the sludge settleability, and has no adverse effect on the removal of total nitrogen and ammonia nitrogen.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a phosphorus removal agent and a using method thereof. Background technique [0002] The principle of biological phosphorus removal: in the biological treatment of wastewater, under anaerobic conditions, the growth of phosphorus accumulating bacteria is inhibited, and the polyphosphate in its cells is released for its own growth, and at the same time, it produces and utilizes simple dissolved organic compounds in wastewater. The energy required by the matrix is ​​called the release of phosphorus in this process. After entering the aerobic environment, the vitality is fully restored. While making full use of the substrate, it absorbs a large amount of dissolved orthophosphate from the wastewater, thereby completing the process of phosphorus accumulation. The purpose of phosphorus removal can be achieved by removing these microorganisms that consume a large amount of ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12
CPCC02F3/1257C02F3/1263Y02W10/10
Inventor 曾祥专卢欢亮汪永红
Owner GUANGDONG PROVINCIAL ACADEMY OF ENVIRONMENTAL SCI
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