Method for synchronously removing nitrogen and phosphorus in mixed nutritional biofilter based on pyrite

A technology of simultaneous nitrogen and phosphorus removal and biological filter, which is applied in the field of simultaneous nitrogen and phosphorus removal by mixed nutrient biological filter based on pyrite, can solve the problem that it is difficult to effectively achieve simultaneous nitrogen and phosphorus removal without sulfide. Wastewater is not suitable for use, the scope of application is narrow, etc., to achieve the effect of rational utilization, increased abundance and low cost

Inactive Publication Date: 2019-02-01
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of the invention is difficult to effectively realize simultaneous denitrification and depho

Method used

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  • Method for synchronously removing nitrogen and phosphorus in mixed nutritional biofilter based on pyrite
  • Method for synchronously removing nitrogen and phosphorus in mixed nutritional biofilter based on pyrite
  • Method for synchronously removing nitrogen and phosphorus in mixed nutritional biofilter based on pyrite

Examples

Experimental program
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Effect test

preparation example Construction

[0037] Step (1), preparation and filling of filler

[0038] Uniformly mix pyrite or pyrite and inorganic carbonate minerals, and fill them into the reactor;

[0039] Step (2), inoculation and hanging film

[0040] Inoculate the sludge of sulfur-containing autotrophic denitrifying bacteria to the reactor in step 1), add nutrient solution to cultivate and carry out inoculation and film formation;

[0041] Step (3), sewage treatment

[0042] Feed the sewage to be treated into the reactor, and add organic carbon sources to the sewage to be treated during the water intake process, and control the carbon-nitrogen ratio of the sewage by adding organic carbon sources to 0.5-12, and the sewage flows through the reaction in an upflow manner The reaction system is formed into a mixed nutrient biofilter, and the hydraulic retention time of the biofilter composed of coupling fillers is controlled at 0.3-1.5h. The sewage is denitrified and dephosphorized in the mixed nutrient biofilter to...

Embodiment 1

[0044] In this example, pyrrhotite was used as the sulfur source, limestone was used as the inorganic carbon source, and they were uniformly mixed at a volume ratio of 9:1 to prepare a filler with a total volume of 10 L. The average particle sizes of the two minerals were 4 mm and 3 mm, respectively. Fill the filler into the reactor, inoculate the anaerobic sludge and add the culture solution, and complete the film formation after 3 days of cultivation. Feed the influent water into the reactor, and add methanol to the influent water, so that the carbon-nitrogen ratio in the sewage is about 3, the hydraulic retention time is 1h, and the nitrogen, phosphorus and sulfate radicals in the influent and effluent water during 101 days of operation are as follows: figure 1 shown. The average influent nitrogen is 11.0mg / l, the average influent phosphorus is 0.74mg / l, the average effluent nitrogen is 0.32mg / l, the average effluent phosphorus is 0.07mg / l, and the average effluent sulfate ...

Embodiment 2

[0047] In this example, pyrite was used as the sulfur source, limestone was used as the inorganic carbon source, and they were uniformly mixed at a volume ratio of 4:1 to prepare a filler with a total volume of 2.3 L. The average particle sizes of the three minerals were 4 mm and 1 mm, respectively. Fill the filler into the reactor, inoculate the anaerobic sludge and add the culture solution, and complete the film formation after 4 days of cultivation. Influent water was passed into the reactor, and glucose was added to the influent water, so that the carbon-nitrogen ratio in the sewage was about 5, the hydraulic retention time was 0.3h, and the influent nitrogen, phosphorus and sulfate radicals were as follows figure 2 shown. The average influent nitrogen is 8.7mg / l, the average influent phosphorus is 1.1mg / l, the average effluent nitrogen is 0.24mg / l, the average effluent phosphorus is 0.07mg / l, and the average effluent sulfate is 71.7mg / l.

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Abstract

The invention discloses a method for synchronously removing nitrogen and phosphorus in a mixed nutritional biofilter based on pyrite, and belongs to the technical field of sewage treatment. A reactoris filled with the pyrite or pyrite and inorganic carbonate minerals which are uniformly mixed, sludge containing autotrophic denitrification bacteria is inoculated into the reactor to realize biofilmformation, sewage to be treated is led into the reactor, the carbon nitrogen ratio of the sewage is controlled by adding an organic carbon source, a reaction system forms the mixed nutritional biofilter, and nitrogen and phosphorus are removed from the sewage in the mixed nutritional biofilter. The biofilter is simple and easy, and hydraulic retention time of only 0.3-1.5 hours is needed when thebiofilter is used for treating the sewage containing nitrogen and phosphorus, so that requirements can be met, nitrogen and phosphorus removing effects are excellent, and the biofilter is low in costand suitable for engineering application. Besides, compared with a traditional sulfur autotrophic denitrification biofilter, the biofilter has the advantage that the concentration of effluent sulfateradicals is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a method for synchronous denitrification and dephosphorization of a pyrite-based mixed nutrition biological filter. Background technique [0002] In recent years, the state has invested a lot of money in the research and development and application of environmental protection technologies. Among them, the upgrading and transformation of sewage treatment is in full swing, and various technologies are also emerging. However, some of these technologies have relatively high costs, and some have limited effects, and many technologies need to consume a large amount of energy when they are applied. Therefore, technologies with low energy consumption, low cost and high efficiency are expected by the market. [0003] The advanced treatment of nitrogen and phosphorus is the top priority of sewage treatment upgrading. Biological methods have the lowest relative c...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/10C02F101/16
CPCC02F3/28C02F2101/105C02F2101/16C02F2305/06
Inventor 李睿华葛志斌王卫罗黎煜关梦莎程绍举
Owner NANJING UNIV
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