A wastewater phosphorus removal device and method for treating phosphorus-containing wastewater

A treatment method and wastewater technology, applied in water/sewage treatment, water/sewage treatment equipment, water/sludge/sewage treatment, etc., can solve the problem of small contact area between precipitant and sewage, difficulty in removing sediment, and reagent utilization. It can reduce the cost of phosphorus removal, improve the utilization of phosphorus removal agent, and achieve the effect of small footprint.

Active Publication Date: 2020-08-04
浙江利欧环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The reagents mentioned above can effectively precipitate inorganic phosphorus in wastewater, and the effect is remarkable, but the utilization rate of these reagents is very low, often less than 1%
The contact area between the precipitant and the sewage is small, and one of the main reasons for the low utilization due to the contact time period
In addition, the phosphate radical removal rate mainly depends on the equilibrium constant of the reaction formula and the ion concentration. According to the above main reaction, since the phosphorus concentration in domestic sewage is low, if the reaction needs to proceed forward, it is necessary to reduce the concentration of sediment and increase the concentration of ions. The concentration of cations is high, and it is difficult to remove the precipitate. Only by continuously increasing the concentration of cations can the effective removal of phosphorus be achieved, resulting in a large amount of phosphorus removal agents being ineffective and wasted.

Method used

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  • A wastewater phosphorus removal device and method for treating phosphorus-containing wastewater
  • A wastewater phosphorus removal device and method for treating phosphorus-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] For a stream of 30m 3 / d of rural domestic sewage, the influent total phosphorus concentration is 7.7mg / L, and the influent pH is 6.3; the height of the phosphorus removal device used is 1.4 meters, and the diameter is 0.7 meters; The finished phosphorus removal agent sold (brand Kaixiong, by Fe 3+ , OH - , SO 4 2- , Mg 2+ and Cl - and other ions).

[0049] In traditional stirred tank+sedimentation tank reactor, when every ton of waste water is added with this dephosphorization dose as 50g, the total phosphorus concentration in the effluent reaches 1.3mg / L, and when the reagent is used in the dephosphorization device of the present invention, every Only 12g needs to be added per ton of wastewater, and the total phosphorus concentration in the wastewater effluent will reach 1.2mg / L.

Embodiment 2

[0051] The sewage system and the device used are the same as in Example 1; the phosphorus removal reagent selected is a finished phosphorus removal liquid sold directly in the market (brand name Zhongbei Environmental Protection, composition is unknown).

[0052] In the traditional stirred tank+sedimentation tank reactor, the dosing amount is 0.3kg / cubic water of liquid, and the total phosphorus concentration in the effluent reaches 0.7mg / L, and when the reagent is used in the phosphorus removal device of the present invention, every ton of wastewater Only 0.09kg needs to be added, and the total phosphorus concentration in the wastewater effluent will reach 0.7mg / L.

Embodiment 3

[0054] For a flow of 75m 3 / d of rural domestic sewage, the influent total phosphorus concentration is 4.5mg / L, and the influent pH is 6.1; the height of the phosphorus removal device used is 1.8 meters, and the diameter is 1 meter; the selected phosphorus removal reagent is directly from the market Finished dephosphorization agent (brand name Zhongbei Environmental Protection, ingredients unknown) sold in China.

[0055] In the traditional stirred tank + sedimentation tank reactor, the dosing amount is 0.2kg / cubic water, and the total phosphorus concentration in the effluent reaches 1.0mg / L. When the reagent is used in the phosphorus removal device of the present invention, every ton of wastewater Only 0.07kg needs to be added, and the total phosphorus concentration in the wastewater effluent will reach 0.9mg / L.

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Abstract

The invention discloses a wastewater dephosphorization device and a method for treating phosphorus-containing wastewater, the dephosphorization device comprises a cylindrical outer casing and a spiraldevice arranged in the outer casing, the spiral device comprises a vertically-arranged central shaft and spiral pieces continuously winding around the central shaft, and the outer edge of the spiralpieces are in contact with the inner wall of the outer casing; the wall, above the top-layer spiral piece, of the outer casing is provided with a medicine feeding port and a water discharge port, themedicine feeding port is arranged above the water discharge port, the wall, between the lowest two layers, of the outer casing is provided with a sewage inlet, and the bottom of the outer casing is provided with a sewage outlet. The wastewater dephosphorization device can effectively improve the contact area and contact time of the wastewater and a phosphorus removal reagent, cleverly realizes regulation of the concentration of phosphate radicals and a precipitant by the self-precipitation principle of the precipitant to promote reaction to proceed in the forward direction, thereby improving the utilization of the phosphorus removal agent.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a spiral phosphorus removal device and a method for treating phosphorus-containing wastewater. Background technique [0002] Phosphorus is an essential element for organisms. However, if the phosphorus content in water exceeds a certain amount, it will not only pose a threat to human health, but also cause harm to aquatic organisms. Studies have shown that when the total phosphorus content in the water body exceeds 0.2mg / L, it can promote the overgrowth of algae, destroy the balance of the original water body, and cause eutrophication pollution. In large sewage treatment plants, the A2O process is often used for biological phosphorus removal, but in small sewage treatment plants or decentralized rural domestic sewage treatment equipment, this cumbersome step is difficult to operate. [0003] Based on this, chemical precipitation is currently an effective method fo...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C02F1/58C02F101/10
CPCC02F1/58C02F2101/105C02F2201/002
Inventor冯华军梁禹翔余晓琴邓永斌周志阳黄鹏张华杰
Owner浙江利欧环保科技有限公司