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Method of intensified denitrification and dephosphorization of urban sewage

A technology for nitrogen and phosphorus removal and urban sewage, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of poor nitrogen and phosphorus removal effect and high cost, and achieve Good effect, low cost, beneficial to growth

Inactive Publication Date: 2009-11-11
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is in order to solve existing A 2 O process has the problems of poor denitrification and phosphorus removal effect and high cost in the treatment of urban sewage, and provides a method for strengthening the denitrification and phosphorus removal of urban sewage

Method used

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  • Method of intensified denitrification and dephosphorization of urban sewage

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specific Embodiment approach 1

[0008] Specific embodiment one: the method for strengthening denitrification and dephosphorization of urban sewage in this embodiment is carried out according to the following steps: the method for strengthening denitrification and dephosphorization of urban sewage is carried out according to the following steps: a, account for 10% of the total volume of residual sludge in the secondary sedimentation tank %~40% of the sludge is ultrasonically crushed and ozone treated, and enters the primary sedimentation tank in an anaerobic environment together with urban sewage for hydrolysis and acidification treatment. The hydraulic retention time of the primary sedimentation tank is 0.5~2h, and the surface load is 0.8~ 1.2m 3 / m 2 h; b. In step a, the mud-water mixture after the hydrolysis and acidification treatment in the primary sedimentation tank and the sludge returned in the secondary sedimentation tank enter the anaerobic section together. The hydraulic retention time of the anaer...

specific Embodiment approach 2

[0013] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the ultrasonic intensity during ultrasonic crushing in step a is 2 to 5 kw / m 3 , Ultrasonic crushing time is 5 ~ 20min. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0014] Specific embodiment 3: The difference between this embodiment and specific embodiment 1 or 2 is that the dosage of ozone during the ozone treatment in step a is 2-10 mg / L, and the time of ozone treatment is 5-10 min. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method of intensified denitrification and dephosphorization of urban sewage, which relates to a method of denitrification and dephosphorization of urban sewage. The method solves the problem of poor denitrification and dephosphorization effect and high cost existing in the existing AO technique for treating urban sewage. The method comprises the steps: a. partial sludge in a secondary sedimentation tank enters into a primary sedimentation tank after ultrasonication and ozone treatment with urban sewage for hydrolyzation and acidification; b. sewage treatment in an anaerobic zone is conducted; c. sewage treatment in an anoxic zone is conducted; d. partial mixed liquid of sludge and sewage in the anoxic zone enters a water distribution sedimentation tank; e. supernatant in the water distribution sedimentation tank enters a chemical reaction sedimentation tank; f. the mixed liquid of sludge and sewage in the Step e and the mixed liquid of sludge and sewage left in the Step d enter an oxic zone; and g. the mixed liquid of sludge and sewage in the oxic zone enters the secondary sedimentation tank, and effluent obtained from the supernatant in the secondary sedimentation tank is the urban sewage after denitrification and dephosphorization. The method has good denitrification and dephosphorization effect and low cost.

Description

technical field [0001] The invention relates to a method for removing nitrogen and phosphorus from sewage. Background technique [0002] As my country's urban sewage discharge standards become more and more stringent, ordinary biological treatment processes can no longer meet the requirements, especially the nitrogen and phosphorus content in sewage is difficult to be effectively removed. At present, the process of phosphorus and nitrogen removal in most sewage treatment plants is activated sludge method A 2 O craft, but A 2 O process also has the following problems: One, A 2 Nitrogen removal and phosphorus removal in the O process have different requirements on sludge age. The sludge age for nitrification and denitrification is more than 15 days, while the sludge age for phosphorus removal is less than 8 days. Because the sludge age cannot meet the requirements of denitrification and removal at the same time Phosphorus requirements, A 2 The effect of the O process on th...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F11/00C02F3/30
Inventor 马军于德淼
Owner HARBIN INST OF TECH
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