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Methanation, denitrification and anammox coupling process based sewage treatment process

A technology of anaerobic ammonium oxidation and sewage treatment, which is applied in the fields of sewage treatment and environmental protection, can solve the problems such as the limitation of denitrification effect, and achieve the effect of simple operation steps

Inactive Publication Date: 2011-09-07
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some deficiencies in denitrification phosphorus removal: (1) NH 4 + -N is only fully oxidized to NO 3 - -N, can be removed through denitrification and phosphorus removal, A designed according to the theory of denitrification phosphorus accumulation 2 The denitrification effect of the NSBR process is therefore limited, and the NH 4 + -N oxidation requires a lot of oxygen; (2) TN / TP of typical urban sewage is about 6-12, and the amount of phosphate absorption in the anoxic section of denitrification phosphorus removal has a certain proportional relationship with the consumption of nitrate, so even if is NH 4 + -N is all oxidized, denitrification phosphorus removal technology can only remove part of nitrogen while removing phosphorus, and the rest of nitrogen cannot be removed through denitrification phosphorus removal

Method used

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  • Methanation, denitrification and anammox coupling process based sewage treatment process
  • Methanation, denitrification and anammox coupling process based sewage treatment process

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Embodiment 1

[0033] Such as figure 1 Shown, use airlift type anaerobic reactor among the present invention, its housing is made of plexiglass, outer cylinder Φ5.2 * 88 (diameter * long cm), reactor total volume is 8.1L, and effective volume is 6.4 L. Aeration head 13 is built in, and internal circulation air pump 6 is used for air lifting and stirring; the temperature of the reactor is controlled on-line in real time, and the water temperature is 32±1°C. The reactor is wrapped with black cloth to avoid light and heat preservation at the same time. The peristaltic pump 4 introduces the synthetic wastewater in the water inlet tank 3 into the reactor from the upper part with a small flow rate, and the effluent is discharged with the peristaltic pump 9. The synthetic wastewater is exposed to argon for 30 minutes before entering the water, so as to Remove oxygen from incoming water. The way of water intake by the peristaltic pump 4 can avoid sudden increase of dissolved oxygen in the reactor ...

Embodiment 2

[0044] In this embodiment, the inoculated sludge and the reaction steps are the same as in Example 1, the difference is that the sewage pumped into the reactor is a simulated domestic sewage water quality, and the specific water quality is: COD 120-150mg / L, ammonia nitrogen 40-80mg / L, nitric acid State nitrogen 5-20mg / L, phosphate 3-10mg / L. After coupling methanation, denitrification and anammox reactions, the effluent NH 4 + -N can be stabilized at 5-15mg / L; effluent NO 2 - -N 0-1mg / L, effluent NO 3 - -N is about 2-5mg / L, the total nitrogen in the effluent is reduced to about 6-18mg / L, and the phosphate in the effluent is 0.1-0.3mg / L. The requirement of TN in grade standard B, namely 20mg / L. In the examples, it was found that DPB accumulates NO 2 - , these NO 2 - Utilized by anammox bacteria, DPB denitrification consumes the dissolved oxygen entrained in the water, eliminates oxygen for anammox bacteria, and creates conditions for the anammox reaction to proceed. At...

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Abstract

The invention provides a methanation, denitrification and anammox coupling process based sewage treatment process. The process is characterized by comprising the following steps: (1) inoculating granular sludge with denitrifying dephosphatation function in an air-lift anaerobic reactor to ensure that the sludge concentration in the reactor is between 5 and 10g / L; (2) pumping the sewage to be treated into the air-lift anaerobic reactor, wherein the sewage to be treated at least contains HCO3-, CO2, NH4+, SO42-, NO3- and PO43-; (3) carrying out air-lift stirring on the pumped sewage by using aninternal circulating gas pump, depositing the sewage after the sewage performs an anaerobic reaction for 3 to 5 hours under an anaerobic condition that the temperature is of 32+ / -1 DEG C; (4) discharging supernate out of the system after deposition; and (5) discharging 10 to 40 volume parts of sludge when the sludge volume is more than 30 percent of the reactor volume. The process realizes coupling of methanation, denitrification and anammox, and simultaneously realizes removal of COD, ammonia nitrogen and total nitrogen in the air-lift anaerobic reactor.

Description

technical field [0001] The invention belongs to the fields of environmental protection and sewage treatment. It specifically relates to a wastewater biological treatment process based on the coupling process of methanation, anaerobic ammonium oxidation and denitrification. Background technique [0002] Anaerobic AMMonium OXidation (ANAMMOX for short) is a new type of biological denitrification process first discovered and named by Delft University of Technology in the Netherlands. Ammonia nitrogen is directly oxidized into nitrogen gas and removed from water, and its biochemical reaction equation is: [0003] NH 4 + +1.32NO 2 - +H + →1.02N 2 +0.26NO 3 - +2H 2 o [0004] In the process of anaerobic ammonium oxidation, not only does organic matter not need to be used as an electron donor, but organic matter can inhibit anaerobic ammonium oxidation. However, 10% of nitrate will be generated during the anammox process, and this part of nitrate cannot be removed throu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F3/12C02F101/16
CPCY02E50/30Y02W10/10
Inventor 操家顺周文理
Owner HOHAI UNIV
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