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Nitrogen and phosphorus removal method by using pyrite as biochemical filling

A technology for nitrogen and phosphorus removal and pyrite removal, which is applied in the direction of anaerobic digestion treatment, can solve problems such as poor results, and achieve the effects of easy engineering promotion and application, low effluent hardness, and simple operation

Active Publication Date: 2011-02-16
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. The technical problem to be solved by the invention: In view of the poor effect of the existing synchronous denitrification and phosphorus removal method, the present invention provides a method for denitrification and phosphorus removal of pyrite as a biochemical filler, which can utilize the physiological and biochemical characteristics of Thiobacillus denitrification and The properties of pyrite, the removal of nitrate in water is achieved by oxidizing pyrite with nitrate as an oxidant under anaerobic conditions by Thiobacillus denitrificans, and the removal of phosphorus in water by using the oxidation product ferrous ions and iron ions to achieve denitrification. Nitrogen and phosphorus removal integration

Method used

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  • Nitrogen and phosphorus removal method by using pyrite as biochemical filling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the start-up of reactor

[0033] The process used in the test is as figure 1 As shown, the waste water to be treated is located in the water tank 1, enters the reactor through the peristaltic pump 2, the inflow flow is measured by the liquid flow meter 3, and the treated water is discharged from the water outlet 5.

[0034] (1) Preparation of reactor packing: screening pyrite with a particle size of 2 to 5 mm and limestone with a particle size of 1 to 2 mm, with a mass ratio of 4:1 and a bed porosity of about 50%, are directly filled into the reaction device;

[0035] (2) In order to start the reactor as soon as possible, the start of the reactor is divided into three stages:

[0036] a. First inoculate the anaerobic sludge from the sewage plant into the reactor, feed the culture solution of Thiobacillus denitrificans into the reactor, set the hydraulic retention time to 8h, and regularly detect NO 3 - -N concentration, NO measured for 3 consecutive ti...

Embodiment 2

[0042] Example 2: Denitrification and dephosphorization of artificially prepared domestic sewage

[0043] The experiment was continued on the basis of the start-up of the Example 1 reactor.

[0044] The test water is artificial water, and the influent NO 3 - -N concentration is 29.52mg / L, TP is 15.37mg / L, pH=7.18, water temperature is 30°C.

[0045] The waste water to be treated is circulated into the reactor after the start-up, and the hydraulic retention time is 5 days, so that the microorganisms can fully contact with the treated waste water; water samples are taken every 24 hours to measure the water quality indicators. The results are shown in the table below, the effluent NO 3 - -N below 1mg / L, NO 2 - -N was not detected; while TP was lower than 0.05mg / L. It can be seen that the treated effluent is better than the first-level discharge standard of pollutant discharge standards for urban sewage treatment plants in my country, and the device operates stably.

[004...

Embodiment 3

[0047] Example 3: Denitrification and dephosphorization of artificially prepared domestic sewage

[0048] The experiment was continued on the basis of the start-up of the Example 1 reactor.

[0049] The test water is artificial water, and the influent NO 3 - -N concentration is 30.14mg / L, TP is 14.19mg / L, pH=5.03, water temperature is 20°C.

[0050] The waste water to be treated is circulated into the reactor after the start-up, and the hydraulic retention time is 5 days, so that the microorganisms can fully contact with the treated waste water; water samples are taken every 24 hours to measure the water quality indicators. The results are shown in the table below.

[0051] Sampling times

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Abstract

The invention discloses a nitrogen and phosphorus removal method by using pyrite as biochemical filling, belonging to the field of simultaneous nitrogen and phosphorus removal of low-carbon and nitrogen ratio sewage. The basic principle is as follows: thiobacillus denitrificans is subject to autotrophic denitrification by using sulfur in pyrite as an energy source, and ferrous ions and iron ions generated in the process of denitrification are used to react with phosphate radical to form precipitation so as to remove phosphorus, thus integral nitrogen and phosphorus removal is realized. The method comprises three stages of the preparation of reactor filling, the starting of a reactor and the operation of the reactor, and has the advantages of high process efficiency, low operation cost and low sludge yield. The reactor of the invention also has the advantages of small floor space and convenient operation. The reactor can work continuously, can be used singly in waste water processing, and also can be used as a processing unit of a processing system.

Description

technical field [0001] The invention relates to a method for removing nitrogen and phosphorus in waste water, more specifically a method for removing nitrogen and phosphorus by using pyrite as a biochemical filler. Background technique [0002] Due to the development of economy, the improvement of living standards, and the acceleration of urbanization, a large amount of nutrients such as N and P enter lakes, reservoirs and oceans along with rivers, causing increasingly serious water eutrophication problems. At present, there is an urgent need for economical and feasible nitrogen and phosphorus removal technologies to control the input of exogenous N and P nutrients, reduce the concentration of N and P in lakes, reservoirs and other water bodies, and control the process of water eutrophication. [0003] Simultaneous nitrogen and phosphorus removal is the development trend of modern wastewater treatment technology. Biological synchronous denitrification and phosphorus removal...

Claims

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Application Information

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IPC IPC(8): C02F3/28
Inventor 李睿华袁玉玲牛建敏刘波
Owner NANJING UNIV
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