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Improved treatment system of activated sludge of urban sewage and starting method

A technology for treating system and urban sewage, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of low SVI value, improved precipitation performance, and cost savings

Inactive Publication Date: 2010-06-09
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the existing synchronous start-up method with the problems of few microorganisms with coagulation performance, slow growth, long start-up time and low efficiency, the present invention uses the latest microbial detection technology to find that the microorganisms existing in urban sewage have different growth and coagulation characteristics , Microorganisms that cannot settle mainly exist in a free state. Although the activity is high, the coagulation performance is poor, and most of them do not have the ability to form bacterial micelles and then form activated sludge flocs; and a large number of beneficial microorganisms grow on the sedimentable particles. , high activity, and strong coagulation ability of bacterial micelles

Method used

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  • Improved treatment system of activated sludge of urban sewage and starting method
  • Improved treatment system of activated sludge of urban sewage and starting method
  • Improved treatment system of activated sludge of urban sewage and starting method

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Embodiment 1

[0029] An intermediate pilot plant of an urban sewage secondary treatment system adopts the anaerobic / anoxic / aerobic (A2 / O) biological treatment method to remove nitrogen and phosphorus. The COD concentration of urban sewage entering the secondary treatment system is 200-300mg / L. Total nitrogen 30-40mg / L, total phosphorus 2-4mg / L. If the traditional synchronous start-up process is adopted, the sludge concentration of the biological treatment system will only be 300-500 mg / L after 30 days of start-up, and the denitrification and phosphorus removal efficiency cannot meet the requirements. After adding 30mg / L flocculant (polyaluminum chloride), the sludge concentration increased slowly until the sludge concentration reached 1500mg / L after 2 months, but the sludge floc structure was loose and the activity was low.

[0030] Adopt the urban sewage denitrification and dephosphorization (A2 / O method) starting method with quick start function of the present invention, as figure 1 and ...

Embodiment 2

[0037] An intermediate pilot plant of an urban sewage secondary treatment system adopts the anaerobic / anoxic / aerobic (A2 / O) biological treatment method to remove nitrogen and phosphorus. The COD concentration of urban sewage entering the secondary treatment system is 200-300mg / L. Total nitrogen 30-40mg / L, total phosphorus 2-4mg / L. Processing methods such as image 3 shown. Its processing step 1, step 3 and step 4 are identical with embodiment 1. Step 2 is as follows:

[0038] Part of the sludge settled in the primary sedimentation tank is subjected to physical crushing pretreatment, and the size range of the crushed sludge is less than 1mm, and then used as the inoculation sludge of the secondary biological treatment system, and injected regularly and quantitatively through the primary sludge return system In the anaerobic tank of the secondary treatment system; the inoculation amount is intermittent, twice a day, each time the inoculation amount is 1 / 20 to 1 / 40 of the tota...

Embodiment 3

[0041] An intermediate pilot plant of an urban sewage secondary treatment system adopts anaerobic / aerobic (A / O) biological treatment method to carry out biological phosphorus removal of urban sewage. The concentration of COD entering the biological treatment system is 250-300 mg / L, and the concentration of total phosphorus 3 to 4 mg / L. Processing methods such as Figure 4 shown.

[0042] Concrete processing steps of the present invention are as follows:

[0043] (1) Urban sewage first passes through the grid and the primary settling tank for the first-level treatment system, and the sludge deposited in the primary settling tank is the primary sludge;

[0044] (2) Part of the sludge settled in the primary sedimentation tank is injected into the anaerobic tank of the biological treatment system in a regular and quantitative manner through the primary sludge return system, and inoculated. The primary sludge return system is composed of a sludge pump 1, a sludge pipeline 2 and ...

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Abstract

The invention discloses an improved treatment system of activated sludge of urban sewage and a starting method. The improved treatment system of activated sludge of urban sewage comprises a primary treatment system and a secondary treatment system, wherein the primary treatment system mainly comprises a grid and a primary sedimentation pond; the secondary treatment system mainly comprises an anaerobic pond, an anoxic pond, an aerobic pond and a sedimentation pond; a primary sedimentation sludge reverse-flow system is arranged between the primary treatment system and the secondary treatment system; and a part of sludge deposited in the primary sedimentation pond as vaccination sludge of the secondary biological treatment system is added to the secondary treatment system in fixed time and fixed quantity by the primary sedimentation sludge reverse-flow system. By using the treatment system, the biological treatment system of the secondary treatment of the urban sewage is quickly started, thereby shortening a starting period; the treatment system exerts performance to the largest limit within the shortest time; at the same time, the operation expense is saved; and the improved treatment system is suitable for the start and the operation maintenance of the secondary treatment system of various urban sewage treatment factories with the primary sedimentation pond by an activated sludge method.

Description

Technical field [0001] The invention relates to an urban sewage treatment system, in particular to an improvement and a start-up method for a sewage activated sludge treatment system of a new urban sewage treatment plant. Background technique [0002] The traditional urban sewage treatment system consists of two parts: primary treatment and secondary treatment. The primary treatment mainly includes grids and primary sedimentation tanks. The grids are used to remove large suspended solids and floating solids in urban sewage, while the primary sedimentation tanks are used to remove suspended solids that can settle in urban sewage; secondary treatment is mainly biological Treatment, including anaerobic ponds, anoxic ponds, aerobic ponds and sedimentation ponds, treats organic matter, nitrogen and phosphorus in sewage. The removal and purification of pollutants in urban sewage is achieved through the action of microorganisms in the activated sludge formed in the reactor (or str...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30
Inventor 彭党聪范奎敬世平万琼房平裴立影
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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