Natural pyrrhotite biological filter and method for synchronously removing nitrate nitrogen and phosphorus out of water by using natural pyrrhotite biological filter

A biofilter and pyrrhotite technology, applied in biological treatment adjustment methods, chemical instruments and methods, biological water/sewage treatment, etc., can solve high treatment costs, low denitrification rate, complex microbial culture solution, etc. problem, to achieve high processing capacity, simple method and good effect

Active Publication Date: 2014-03-12
NANJING UNIV
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AI Technical Summary

Problems solved by technology

[0008] For the treatment of low carbon nitrogen ratio sewage, the traditional biological water treatment process such as A 2 / O and other simultaneous denitrification and phosphorus removal effects are not good; the sulfur / limestone system has a good denitrification effect, but basically no phosphorus removal effect; the pyrite / limestone system has a good denitrification and phosphorus removal effect, but the denitrification The rate is very low, and limestone needs to be added as an auxiliary material; the sulfur autotrophic denitrification and phosphorus removal system using industrial ferrous sulfide improves the denitrification rate while maintaining a high denitrification and phosphorus removal effect, but this technology is not suitable for anaerobic High environmental requirements, only intermittent operation, poor water treatment ability, complex microbial culture solution, high treatment cost, low practical application value and other existing problems in the prior art, the present invention provides a natural pyrrhotite A biofilter and a method for synchronously removing nitrate nitrogen and phosphorus in water by using it, which utilizes a single pyrrhotite, and in the case of continuous water inflow, Thiobacillus denitrification uses pyrrhotite as a sulfur source to reduce nitrate to nitrogen, Metabolite iron ions and pyrrhotite itself are used to remove phosphorus in water to achieve efficient simultaneous denitrification and phosphorus removal. The H produced during the simultaneous denitrification and phosphorus removal of pyrrhotite + Rarely, there is no need to add limestone for neutralization, which greatly improves the unit reactor processing capacity

Method used

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  • Natural pyrrhotite biological filter and method for synchronously removing nitrate nitrogen and phosphorus out of water by using natural pyrrhotite biological filter
  • Natural pyrrhotite biological filter and method for synchronously removing nitrate nitrogen and phosphorus out of water by using natural pyrrhotite biological filter
  • Natural pyrrhotite biological filter and method for synchronously removing nitrate nitrogen and phosphorus out of water by using natural pyrrhotite biological filter

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Effect test

Embodiment 1

[0036] The treatment object is artificially prepared sewage composed of tap water, potassium dihydrogen phosphate and potassium nitrate, and the content of some pollutants is: NO 3 - -N27mg / L, PO 4 3--P6mg / L, water temperature 18°C. Its processing steps are:

[0037] (1) Preparation and construction of biofilter filler: prepare pyrrhotite into granular materials with a particle size between 2-20 mm; fill granular pyrrhotite into the reactor, and then rinse the reactor with clean water. The flushing can be stopped when the water out of the outlet is basically colorless; the measurement shows that the pH of the flushing water is 6, the bottom of the reactor is equipped with a water inlet, and the top is equipped with a water outlet; the reactor is a cylindrical reaction column with a height-to-diameter ratio of 3 ︰1. The cone is connected to the cylinder to facilitate even water in and out;

[0038] (2) Start-up of the biofilter: Mix anaerobic sludge and nutrient solution ...

Embodiment 2

[0041] Same as Example 1, the difference is: the hydraulic retention time of the mixed nutrient solution is 24 hours during the start-up process of the biofilter in step (2). After the start-up, the reactor is pumped into the waste water to be treated, the hydraulic retention time is 24 hours, it runs for one month, and sampling analysis is performed every 2 days. The results are as follows: figure 2 shown. The final effluent nitrate nitrogen is stable at 1.13mg / L, phosphate phosphorus is stable at 0.22mg / L, the removal rate of nitrate nitrogen is 95.8%, and the removal rate of phosphorus is 96.3%.

Embodiment 3

[0043] Same as Example 1, the difference is: the hydraulic retention time of the mixed nutrient solution during the start-up of the biofilter in step (2) is 20 hours. The external structure of the reactor is a cuboid, and the ratio of the length to the width of the cuboid is equal to 3:1.

[0044] The test water is artificially prepared sewage composed of tap water, potassium dihydrogen phosphate and potassium nitrate, NO 3 - -N28mg / L, PO 4 3- -P12mg / L, water temperature 18°C; pump the reactor after start-up into the waste water to be treated, the hydraulic retention time is 24 hours, run for one month, sample and analyze every 2 days, the results are as follows image 3 shown. The final effluent nitrate nitrogen is stable at 2.03mg / L, phosphate phosphorus is stable at 0.47mg / L, the removal rate of nitrate nitrogen is 92.8%, and the removal rate of phosphorus is 96.1%.

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Abstract

The invention discloses a natural pyrrhotite biological filter and a method for synchronously removing nitrate nitrogen and phosphorus out of water by using the natural pyrrhotite biological filter, which belongs to the field of advanced wastewater treatment. The method comprises the following steps: (1) preparing and constructing biological filter fillers; (2) starting the biological filter; and (3) operating the biological filter. Pyrrhotite is used as an electron donor of sulfur autotrophic denitrification bacteria to reduce nitrate in the water to nitrogen so as to remove nitrate nitrogen out of the water; and the pyrrhotite and an oxidative product of the pyrrhotite remove phosphorus in such manners as adsorption and chemical precipitation so as to synchronously remove nitrate nitrogen and phosphorus out of the water. The biological filter disclosed by the invention is simple to construct, convenient to start, stable to operate, high in nitrogen and phosphorus removal efficiency and free of auxiliary materials, and the biological filter is applied to advanced wastewater treatment.

Description

technical field [0001] The invention belongs to the field of advanced treatment of sewage, and in particular relates to a natural pyrrhotite biological filter and a method for synchronously removing nitrate nitrogen and phosphorus in water by using it. Background technique [0002] In the traditional water treatment biological denitrification process, digestive bacteria convert ammonium nitrogen into nitrate nitrogen under aerobic conditions, and heterotrophic denitrifying bacteria convert nitrate nitrogen into nitrogen gas under anoxic conditions, thereby realizing the removal of nitrogen in water. The traditional process of biological phosphorus removal in water treatment is that phosphorus removal bacteria release phosphorus under anaerobic conditions, absorb phosphorus excessively under aerobic conditions, and reproduce in large quantities, and finally realize phosphorus removal from Remove from water. The two processes of biological denitrification and biological phosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
CPCC02F3/006C02F3/345C02F2209/001C02F2209/06C02F2209/44C02F2305/06C02F3/2826C02F1/281C02F2003/001C02F2101/105C02F2101/163C02F1/5245
Inventor 李睿华胡俊松孙茜茜张小梅刘卓占新民李爱民
Owner NANJING UNIV
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