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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AI-Extracted 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...

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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.

Application Domain

Treatment with anaerobic digestion processes

Technology Topic

IonChemistry +17

Image

Examples

Experimental program(5)

Example Embodiment

[0032] Example 1: Start-up of the reactor

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

[0034] (1) Reactor packing preparation: Screen pyrite with a particle size of 2-5mm and limestone with a particle size of 1-2mm. According to the mass ratio of 4:1, the bed porosity is about 50%, directly filled into the reaction Device

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

[0036] a. First inoculate the anaerobic sludge from the wastewater treatment plant into the reactor, pass the Thiobacillus denitrificans culture solution into the reactor, set the hydraulic retention time to 8h, and regularly detect NO 3 - -N concentration, NO measured for 3 consecutive times 3 - -If the removal rate of N reaches more than 60% and the operation is stable, it is considered that the start-up of stage a of the reactor is successful; the composition of the Thiobacillus denitrifica 2 S 2 O 3 ·5H 2 O 0.5g/L, KNO 3 0.2g/L, KH 2 PO 4 0.2g/L, NaHCO 3 0.1g/L, MgCl 2.6H 2 O 0.05g/L, NH 4 Cl 0.05g/L, FeSO 4 ·7H 2 O 0.001g/L.

[0037] b. Then reduce the sodium thiosulfate concentration in the Thiobacillus denitrificans culture solution to 50% of stage a, and continue to acclimate until the biofilm grows and matures again, completing the initiated stage b;

[0038] c. Finally, the sodium thiosulfate in the culture solution of Thiobacillus denitrificans is completely removed in the final water, and the hydraulic retention time is gradually extended to 5 days, so that the microorganisms can use the pyrite in the filter as a sulfur source for growth and reproduction, and finally make The biofilm has grown steadily and completed the start-up phase.

[0039] The following table shows NO 3 - -N removal rate changes, the pyrite/limestone reactor is 3 - The removal rate of -N tends to be stable, but when sodium thiosulfate is completely omitted, the removal rate is significantly reduced. This is mainly because the acidity in the filter column is relatively high, and the start-up hydraulic retention time is too short, which fails to provide a better growth environment for Thiobacillus denitrificans. When the hydraulic retention time is appropriately extended to 5d, NO 3 - -N can reach more than 90%, which indicates that the reactor has started successfully.

[0040] Sampling times

[0041] 4

Example Embodiment

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

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

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

[0045] The wastewater to be treated is circulated into the reactor after the start-up. The hydraulic retention time is 5 days, so that the microorganisms and the treated wastewater are fully contacted; water samples are taken every 24 hours to determine the water quality indicators. The results are shown in the table below, effluent NO 3 - -N is less than 1mg/L, NO 2 - -N was not detected; and 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.

[0046] Sampling times

Example Embodiment

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

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

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

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

[0051] Sampling times

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PUM

Property	Measurement	Unit
Particle size	2.0 ~ 5.0	mm
Particle size	1.0 ~ 2.0	mm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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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

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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