Title:
METHOD FOR DEEP DENITRIFICATION USING SHORT-RANGE NITRIFICATION AND DENITRIFICATION COUPLED TWO-STAGE AUTOTROPHIC DENITRIFICATION
Document Type and Number:
WIPO Patent Application WO/2019/228472
Kind Code:
A1
Abstract:
A method for deep denitrification with short-range nitrification and denitrification coupled two-stage autotrophic denitrification, the method comprising the following steps: S1: introducing sewage into a nitrification and denitrification tank for short-range nitrification and denitrification treatment, and then introducing same into an adjustment tank 1, controlling dissolved oxygen content in the nitrification and denitrification tank to be 0.4-0.6mg/L, and discharging water when the molar ratio of nitrite to ammonia nitrogen in the adjustment tank 1 is (1.0-1.3) to 1; S2: introducing the water discharged from the adjustment tank 1 into an anaerobic ammonium oxidation tank for anaerobic ammonia oxidation treatment, introducing same into an adjustment tank 2, and controlling the pH in the anaerobic ammonium oxidation tank to be 7.0-7.4 and the temperature to be 22-28°C; and S3: introducing the water discharged from the adjustment tank 2 and 1.1-1.5g/L sulfide into a sulfur autotrophic denitrification tank for denitrification treatment and discharging the water, and controlling the pH of the sulfur autotrophic denitrification tank to be 7.5-8.0, the temperature to be 28-32°C and the mass ratio of sulfur to nitrogen to be (1.9-2.0) to 1. The present method has a high sewage treatment efficiency, the ammonia and nitrogen in the discharged water is reduced to be 10mg/L or below, the nitrate and nitrogen in the discharged water is reduced to be 5mg/L or below, and the treatment performance is good.
Inventors:
LV HUI (CN)
DIAO XINGXING (CN)
PENG HEQU (CN)
LIU SHIJUN (CN)
ZHAO QING (CN)
MENG LIAO (CN)
SONG NAIQIAO (CN)
DIAO XINGXING (CN)
PENG HEQU (CN)
LIU SHIJUN (CN)
ZHAO QING (CN)
MENG LIAO (CN)
SONG NAIQIAO (CN)
Application Number:
PCT/CN2019/089344
Publication Date:
December 05, 2019
Filing Date:
May 30, 2019
Export Citation:
Assignee:
UNIV SUN YAT SEN (CN)
SHENZHEN LISAI IND DEVELOPMENT CO LTD (CN)
SHENZHEN LISAI IND DEVELOPMENT CO LTD (CN)
International Classes:
C02F3/30
Foreign References:
| CN108483655A | 2018-09-04 | |||
| CN107140735A | 2017-09-08 | |||
| CN107364967A | 2017-11-21 | |||
| CN105330023A | 2016-02-17 | |||
| CN107285465A | 2017-10-24 | |||
| JPH067789A | 1994-01-18 |
Attorney, Agent or Firm:
WAYNE INTELLECTUAL PROPERTY AGENCY CO., LTD. (CN)
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