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Nitrogen and phosphorus removal technological method for sewage treatment with capabilities of endogenesis strengthening and postposition denitrification

A post-denitrification, denitrification and phosphorus removal technology, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The problem of age contradiction and nitrate problem, reducing the phosphorus removal efficiency of the system, etc., achieves the effect of improving the post-endogenous denitrification function, reducing the amount of sludge produced, and improving the phosphorus removal efficiency of the system

Inactive Publication Date: 2015-03-04
HUNAN UNIV OF SCI & TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

In the simultaneous biological denitrification and biological phosphorus removal sewage biological treatment system, biological denitrification and biological phosphorus removal usually have carbon source conflicts, sludge age conflicts and nitrate problems, which makes it difficult for TN and TP in the effluent to meet the discharge standards at the same time
The traditional sewage biological nitrogen and phosphorus removal process (such as SBR, A 2 O process), according to the "anaerobic / anoxic / aerobic / sedimentation / effluent" process operation or in the form of "anaerobic / anoxic / aerobic" process layout, basically no post-built endogenous denitrification function, resulting in The nitrate concentration in the effluent and return sludge is high, which in turn affects the absorption of volatile fatty acids and phosphorus release by phosphorus accumulating bacteria under anaerobic conditions, reducing the phosphorus removal efficiency of the system, and the system has a high sludge production

Method used

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  • Nitrogen and phosphorus removal technological method for sewage treatment with capabilities of endogenesis strengthening and postposition denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The influent water quality of a city sewage plant is as follows: COD C 438.6mg / L, NH + 4 -N is 30.08mg / L, NO 3 - -N is 1.1mg / L, TN is 35.18mg / L, TP is 4.52mg / L, adopts the method of the present invention to carry out denitrification and dephosphorization, and the specific embodiment is:

[0021] (1) Referring to Fig. 1, the control time of each process in the present embodiment is as follows: water inflow and anaerobic reaction time are 90min altogether, aerobic 1 reaction time is 165min, anoxic reaction time is 40min, aerobic 2 reaction time is 30min, Settling time is 30min, drainage is 5min, sludge pre-anoxic reaction time is 120min, and reaction cycle is 8h.

[0022] (2) The process parameters of this embodiment are mainly controlled as follows: the flushing ratio of the system feed water (the ratio of the system feed water volume to the reactor volume in one cycle) is 0.5, and the MLSS of aerobic 1 is controlled to be about 4000mg / L The dissolved oxygen concent...

Embodiment 2

[0027] The influent water quality of a city sewage plant is as follows: COD C 330.5mg / L, TN is 37.13mg / L, NH + 4 -N is 28.53mg / L, NO 3 - -N is 1.50mg / L, TP is 5.09mg / L, adopts the method of the present invention to carry out denitrification and dephosphorization, and the specific embodiment is:

[0028] (1) Referring to Fig. 1, the control time of each process of the present embodiment is as follows: water inflow and anaerobic reaction time are 90min altogether, aerobic 1 reaction time is 180min, anoxic reaction time is 40min, and aerobic 2 reaction time is 30min , the sedimentation time is 30min, drainage is 5min, the sludge pre-anoxic reaction time is 90min, and the reaction cycle is 8h.

[0029] (2) The process parameters of this embodiment are mainly controlled as follows: the flushing ratio of the system feed water is 0.5, the MLSS of aerobic 1 is controlled to be about 4300mg / L; the dissolved oxygen concentration of aerobic 1 is controlled to be 2.5~3.5mg / L L, the d...

Embodiment 3

[0034] The water quality of a city's sewage (including a small amount of industrial wastewater) is as follows: COD C is 390.2mg / L, TN is 37.8mg / L, NH + 4 -N is 32.77mg / L, NO 3 - -N is 1.5mg / L, TP is 4.36mg / L, adopts the method of the present invention to carry out denitrification and dephosphorization, and the specific embodiment is:

[0035] (1) Referring to Fig. 1, the control time of each process in the present embodiment is as follows: water inflow and anaerobic reaction time are 90min altogether, aerobic 1 reaction time is 150min, anoxic reaction time is 30min, and aerobic 2 reaction time is 30min , the sedimentation time is 30min, drainage is 5min, the sludge pre-anoxic reaction time is 145min, and the reaction cycle is 8h.

[0036] (2) The process parameters of this embodiment are mainly controlled as follows: the flushing ratio of the system feed water is 0.5, the MLSS of aerobic 1 is controlled to be about 4300mg / L; the dissolved oxygen concentration of aerobic 1 ...

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Abstract

The invention discloses a nitrogen and phosphorus removal technological method for sewage treatment with the capabilities of endogenesis strengthening and postposition denitrification. The nitrogen and phosphorus removal technological method is a sequencing batch type nitrogen and phosphorus removal process and comprises the following eight steps: water intake procedure, anaerobic procedure, primary aerobic procedure, hypoxic procedure, secondary aerobic procedure, precipitation procedure, water and sludge discharge procedure, sludge hypoxic preconditioning procedure. According to the nitrogen and phosphorus removal technological method disclosed by the invention, endogenesis denitrification process of a system is strengthened by virtue of the hypoxic procedure and the sludge hypoxic preconditioning procedure, so that the nitrogen removal effect of the system is improved; meanwhile, by virtue of the endogenesis denitrification process in the sludge hypoxic preconditioning procedure, the nitrate concentration in returned sludge is effectively lowered, so that the nitrate problem in synchronous nitrogen and phosphorus removal process is effectively relieved, and good foundation of anaerobic phosphorus release is laid. With the adoption of the nitrogen and phosphorus removal technological method, the contradiction of biological nitrogen removal and biological phosphorus removal can be relieved, the efficiencies of nitrogen and phosphorus removal are both high, and the system is small in sludge yield, is simply controlled, is easy in production and implementation and has potential and wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and environmental protection engineering, and specifically relates to a process method for denitrification and denitrification of sewage treatment by strengthening endogenous post-position denitrification. Background technique [0002] Research and development of new high-efficiency simultaneous denitrification and phosphorus removal technologies and processes is one of the research hotspots in the field of sewage treatment today. In the simultaneous biological denitrification and biological phosphorus removal sewage biological treatment system, biological denitrification and biological phosphorus removal usually have carbon source contradictions, sludge age contradictions and nitrate problems, which makes it difficult for TN and TP in the effluent to meet the discharge standards at the same time. The traditional sewage biological nitrogen and phosphorus removal process (such as SBR, A 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
CPCC02F3/305C02F3/308
Inventor 邓仁健任伯帜
Owner HUNAN UNIV OF SCI & TECH
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