Biological nitrogen and phosphorus removal method and system for sewage

A sewage biological, nitrogen and phosphorus removal technology, applied in the field of sewage biological nitrogen and phosphorus removal, can solve the problems of sewage treatment plants that are difficult to achieve high standards of discharge, increase treatment costs, and effluent COD exceeds the standard.

Active Publication Date: 2020-12-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of traditional biological treatment technology is mature and easy to operate, but it often faces the problem of unstable denitrification and phosphorus removal process and limited deep nitrogen and phosphorus removal capacity
In particular, my country's sewage treatment plants often face low COD in sewage. Since the denitrification process needs to consume carbon s

Method used

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  • Biological nitrogen and phosphorus removal method and system for sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0160] The system of the sewage biological denitrification and dephosphorization used in the embodiment is as figure 1 As shown, follow the steps below:

[0161] (1) The sewage flow is pretreated sequentially through the interception device 1001 and the sand settling device 1002, and the initial total nitrogen and total phosphorus concentrations of the sewage are measured. The total nitrogen concentration is 40 mg / L, and the total phosphorus concentration is 10 mg / L; wherein, the interception device 1001 is a grid, and the sand settling device 1002 is a swirling flow sand settling device;

[0162] (2) The pretreated sewage flows through the anaerobic device 1, the anoxic device 2, the aerobic device 3, the aerobic device 4 and the membrane-based biofilm device 6 for anaerobic treatment, anoxic treatment, and aerobic treatment in sequence. , anaerobic treatment and membrane-based biological treatment; in anaerobic treatment, the oxidation-reduction potential is -120mV, and the...

Embodiment 2

[0167] The system of the sewage biological denitrification and dephosphorization used in the embodiment is as figure 1 As shown, follow the steps below:

[0168] (1) The sewage flow is pretreated sequentially through the interception device 1001 and the sand settling device 1002, and the initial total nitrogen concentration of the measured sewage is 41 mg / L, and the total phosphorus concentration is 10 mg / L; wherein, the interception device 1001 is a grid, and the sand settling The device 1002 is a cyclone sand settling device;

[0169] (2) The pretreated sewage flows through the anaerobic device 1, the anoxic device 2, the aerobic device 3, the aerobic device 4 and the membrane-based biofilm device 6 for anaerobic treatment, anoxic treatment, and aerobic treatment in sequence. , anaerobic treatment and membrane-based biological treatment; in anaerobic treatment, the redox potential is -100mV, and the hydraulic retention time is 1h; in anoxic treatment, the dissolved oxygen c...

Embodiment 3

[0174] The system of the sewage biological denitrification and dephosphorization used in the embodiment is as figure 1 As shown, follow the steps below:

[0175] (1) The sewage flow is pretreated sequentially through the interception device 1001 and the sand settling device 1002, and the initial total nitrogen concentration of the measured sewage is 42 mg / L, and the total phosphorus concentration is 11 mg / L; wherein, the interception device 1001 is a grid, and the sand settling The device 1002 is a cyclone sand settling device;

[0176] (2) The pretreated sewage flows through the anaerobic device 1, the anoxic device 2, the aerobic device 3, the aerobic device 4 and the membrane-based biofilm device 6 for anaerobic treatment, anoxic treatment, and aerobic treatment in sequence. , anaerobic treatment and membrane-based biological treatment; in anaerobic treatment, the oxidation-reduction potential is -150mV, and the hydraulic retention time is 1.5h; in anoxic treatment, the di...

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Abstract

The invention relates to the field of water treatment, in particular to a biological nitrogen and phosphorus removal method and system for sewage. The method comprises the following steps: 1) performing anaerobic treatment on a to-be-treated water body; 2) carrying out anoxic treatment on the water body obtained by anaerobic treatment; 3) carrying out aerobic treatment on the water body obtained by anoxic treatment; 4) carrying out oxygen elimination treatment on the water body obtained by aerobic treatment; 5) refluxing a part of supernatant of the water body obtained by oxygen elimination treatment to the step 2) for anoxic treatment; 6) carrying out membrane-based biological treatment on part of supernatant of the water body obtained by oxygen elimination treatment; 7) carrying out precipitation treatment on a lower-layer mud-water mixture of the water body obtained by the oxygen elimination treatment; 8) refluxing part of the water body obtained by the membrane-based biological treatment to the step 1) for anaerobic treatment; and 9) refluxing part of the water body obtained by the membrane-based biological treatment to the step 3) for aerobic treatment. The method is good in removal effect of total nitrogen and total phosphorus pollutants, simple and convenient to operate, low in energy consumption and stable in up-to-standard emission.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method and system for biological denitrification and dephosphorization of sewage. Background technique [0002] With the rapid development of my country's economy, the problem of water pollution is becoming more and more serious. In 2018, the total amount of sewage generated in my country reached 70.8 billion tons, of which domestic sewage accounted for 74.4%, becoming the main source of sewage. Domestic sewage is often rich in nitrogen and phosphorus pollutants. In 2015, the total discharge of ammonia nitrogen in my country's urban domestic sewage reached 1.341 million tons, accounting for 60% of the total discharge of all types of sewage. Therefore, the problem of nitrogen and phosphorus removal is still a major challenge for my country's sewage treatment industry. Therefore, efficient removal of nitrogen and phosphorus from sewage is still a major challenge for my country's...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F101/16C02F101/10
CPCC02F3/308C02F3/30C02F2101/105C02F2101/16
Inventor 郑雄杨澜陈银广吴瑒武婧
Owner TONGJI UNIV
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