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Method for starting and stably keeping micro-expansion of sludge in synchronous biological nitrogen and phosphorus removal system

A biological denitrification and micro-expansion technology, applied in the field of biochemical wastewater treatment, can solve problems such as the length of the secondary sedimentation tank, and achieve the effects of improving the removal rate of organic matter, improving the removal rate of organic matter and saving economic costs.

Active Publication Date: 2014-01-01
SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD
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AI Technical Summary

Problems solved by technology

Although the settling performance of the slightly expanded sludge is slightly worse than that of the unexpanded sludge, because the HRT of the secondary settling tank is generally longer, the slight deterioration of the settling performance will not affect the mud-water separation effect of the secondary settling tank

Method used

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  • Method for starting and stably keeping micro-expansion of sludge in synchronous biological nitrogen and phosphorus removal system
  • Method for starting and stably keeping micro-expansion of sludge in synchronous biological nitrogen and phosphorus removal system
  • Method for starting and stably keeping micro-expansion of sludge in synchronous biological nitrogen and phosphorus removal system

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Effect test

example 1

[0042] The actual domestic sewage of a community next to a university in Beijing was used as the treatment object (COD=210.2-369.6 mg / L, TN=49.71-82.59 mg / L, PO 4 -P =4.4-8.4 mg / L), the treated water volume is Q=198 L / d, the biochemical tank is maintained at SRT=15d, HRT=8h, the internal return ratio and the sludge return ratio are 150% and 100% respectively, and the room temperature is Around 20°C. Experimental results such as figure 2 , 3 , 4, and 5.

[0043] figure 2 The change curve of sludge SVI before and after the realization of micro-expansion shows that maintaining a constant DO can basically ensure that the SVI is maintained at a level of about 200 ml / g. During the stable maintenance for nearly 100 days, no serious deterioration of the settlement performance and effluent quality occurred.

[0044] image 3 , 4 , 5 is micro-expansion before and after the realization of the system for COD, TN and PO 4 -P removal effect. The results show that the realization ...

example 2

[0046] The actual domestic sewage of a community next to a university in Beijing was used as the treatment object (COD=210.2-369.6 mg / L, TN=49.71-82.59 mg / L, PO4 -P =4.4-8.4 mg / L), by manually adding sodium acetate, ammonium chloride or potassium dihydrogen phosphate to change the organic load, nitrogen and phosphorus load of the influent respectively, and investigate the effect of load shock on simultaneous biological denitrification Effect of microswelling stability of phosphorus systems. The treated water volume is Q=198 L / d, the biochemical pool is maintained at SRT=15d, HRT=8h, the internal return ratio and sludge return ratio are 150% and 100% respectively, and the room temperature is about 20°C. The load change adopts the method of regular dosing, and the organic load (or nitrogen and phosphorus load) is increased by 50% at 7:00-9:00 in the morning and 19:00-21:00 in the evening every day, and the water quality is normal at other times. The test results show that the sy...

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Abstract

The invention relates to a method for starting and stably keeping the micro-expansion of sludge in a synchronous biological nitrogen and phosphorus removal system, belonging to the field of treating sewage biochemically. A device for implementing the method is formed by connecting a water inlet pool, anaerobic cells, hypoxic cells, aerobic cells and a secondary settling pool in sequence. The wall of the secondary settling pool is provided with a sludge height mark so that the degree of expansion of the sludge can be known in real time. Each aerobic cell is provided with an independent dissolved-oxygen probe, and the dissolved-oxygen probe is connected with a dissolved-oxygen instrument. The control platform of a PLC (programmable logic controller) is used for controlling the concentration of the dissolved oxygen in each aerobic cell accurately according to the parameter set value and the feedback signal of the dissolved-oxygen instrument. The micro-expansion of the sludge in the synchronous biological nitrogen and phosphorus removal system is started by reducing the concentration of the dissolved oxygen in each aerobic cell to 0.8-1.0 mg / L, and the dissolved oxygen is regulated according to monitoring result of the SVI (sludge volume index), the height of the sludge in the secondary settling pool, the quality of the effluent of the device and other parameters so as to keep the micro-expansion of the sludge stable. Due to the adoption of the method, the pollutant removal rate is improved, the quality of the effluent is guaranteed, the aeration energy consumption of the water plant is reduced, and the energy-efficient treatment of the effluent is realized.

Description

technical field [0001] The invention relates to an energy-saving treatment method for synchronous biological denitrification and dephosphorization of sewage, especially a method for starting and stably maintaining the sludge micro-expansion in the synchronous biological denitrification and dephosphorization system of the anaerobic grid and the anoxic grid, which belongs to biochemical Technical field of legal sewage treatment. The invention achieves the purpose of saving aeration energy consumption and strengthening the effect of nitrogen and phosphorus removal by reducing the DO concentration of the aerobic grid and controlling the expansion degree of the sludge, and is suitable for urban sewage treatment plants and industrial wastewater treatment plants of various scales . Background technique [0002] Water is closely related to human production and life, and the seriousness of water pollution has attracted the attention and attention of countries all over the world. At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 彭永臻杨雄宋姬晨王淑莹郭建华
Owner SDIC XINKAI WATER ENVIRONMENT INVESTMENT CO LTD
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