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Water treatment device and treatment method for nitrogen and phosphorus removal

A technology of water treatment device and sewage treatment method, which can be applied in biological water/sewage treatment, special compound water treatment, water/sludge/sewage treatment, etc.

Active Publication Date: 2021-09-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not rely on organic carbon sources and has a certain phosphorus removal effect. However, after the reactor has been in operation for a period of time, the surface of the iron ore will be passivated, resulting in significantly worse nitrogen and phosphorus removal effects.

Method used

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  • Water treatment device and treatment method for nitrogen and phosphorus removal
  • Water treatment device and treatment method for nitrogen and phosphorus removal
  • Water treatment device and treatment method for nitrogen and phosphorus removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The experimental device adopted by the sewage treatment method of the present invention is as figure 1 As shown, the water treatment device of the present invention includes a biofilter 1 and a nitrification reaction tank 10; a pyrite filler 6 is filled in the biofilter 1, and an activated sludge microbial film is attached to the surface of the pyrite filler 6; the biofilter 1 is equipped with water inlet I4, water outlet I5 and water outlet II7 (the water inlet I4, water outlet I5 and water outlet II7 are all equipped with valves), and the water inlet I4 of biological filter 1 is connected to two water inlet branches. The water inlet branch passes the sewage to be treated into the biofilter 1 through the water inlet pump I3, and the second water inlet branch connects with the nitrification reaction liquid storage tank 14 through the water inlet pump I3, and the first water inlet branch and the second water inlet branch are both There are switches (respectively switch 2...

Embodiment 2

[0036] The sewage treatment method of the present embodiment, the basic process is the same as that of the embodiment 1, the difference is that in the step 1 of the present embodiment, the influent NO 3 - -N concentration is 21.88mg / L, PO 4 3- -P concentration is 12.31mg / L, the hydraulic retention time of sewage to be treated in biofilter 1 is 48h, the result is as follows image 3 As shown, the measured effluent NO 3 - -N and PO 4 3- -P concentrations were 8.67mg / L and 6.15mg / L, respectively. After biofilter 1 has been in operation for 60 days, the removal rate of nitrate nitrogen in biofilter 1 is only 12.49%. At this time, the surface of pyrite filler is passivated; in step 2, the concentration of ammonia nitrogen in ammonia nitrogen wastewater is 47.89mg / L, and the nitrification reaction The hydraulic retention time of ammonia nitrogen wastewater in pool 2 is 24h, and the pH of the effluent is 5.2; in step 3, pickling pyrite is soaked in an acid solution with a pH o...

Embodiment 3

[0038] The sewage treatment method of the present embodiment, the basic process is the same as the embodiment 1, the difference is that in the step 2 of the present embodiment, the concentration of ammonia nitrogen in the ammonia nitrogen wastewater is 50mg / L, and the hydraulic retention time of the ammonia nitrogen wastewater in the nitrification reaction tank 2 is 72h, The pH of the effluent was 4.9; in step 3, pickling the pyrite was soaked in an acid solution with a pH of 4.9 for 24 hours, and 1.14 g of precipitate was recovered from the washing liquid recovery pool 8, and the recovery rate of total phosphorus was 66.22%.

[0039] The sewage treatment process of the present invention first adopts pyrite autotrophic denitrification to simultaneously remove nitrogen and phosphorus in water; then utilizes nitrification reaction to produce acid, and finally utilizes the acid solution generated by nitrification reaction to carry out pickling regeneration on the passivated pyrite ...

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Abstract

The invention discloses a water treatment device for denitrification and phosphorus removal and a method for deep denitrification and phosphorus removal of sewage. The device includes a biological filter and a nitrification reaction tank; the biological filter is filled with pyrite filler, sulfur iron There is a microbial film attached to the surface of the mineral filler; the biofilter is provided with a water inlet, a drain port I and a drain port II, and the water inlet of the biofilter is connected to two water inlet branches, and the first water inlet branch passes through the water inlet pump I to treat Sewage is input into the biofilter, and the second water inlet branch is connected to the nitrification reaction liquid storage tank through the water inlet pump I, and is used for flushing the filler in the filter. After the sewage is treated by the biological filter, it is discharged from the outlet I, and the biological filter is connected to the flushing liquid recovery tank through the outlet II; the nitrification reaction tank is equipped with a water inlet and a drain outlet, and the ammonia nitrogen wastewater is input into the nitrification reaction tank by the inlet pump II, and the nitrification The outlet of the reaction tank is connected to the nitrification reaction liquid storage tank, and the nitrification reaction tank is inoculated with activated sludge and aerated by an air pump.

Description

technical field [0001] The invention relates to a water treatment device for nitrogen and phosphorus removal, and also relates to a sewage treatment method of the water treatment device for nitrogen and phosphorus removal, belonging to the technical field of sewage treatment. Background technique [0002] In recent years, with the rapid development of my country's economy and society, the amount of sewage discharged by human activities has increased significantly, leading to the accumulation of nitrogen and phosphorus in water bodies, resulting in eutrophication of water bodies and deterioration of water quality, affecting natural landscapes and drinking water safety, and threatening the survival of aquatic organisms. This leads to the death of a large number of aquatic organisms due to hypoxia. Therefore, the removal of nitrogen and phosphorus from wastewater has attracted widespread attention. How to improve the removal rate of nitrogen and phosphorus in wastewater discharg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C01B25/04C02F101/16
CPCC01B25/04C02F3/34C02F2101/105C02F2101/163C02F2305/06
Inventor 叶林黄开龙张良颖张徐祥任洪强
Owner NANJING UNIV
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