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A method for realizing rapid start of denitrification in low temperature period of deep bed filter

A rapid start-up and denitrification technology, applied in chemical instruments and methods, anaerobic digestion treatment, water treatment under temperature conditions, etc., can solve the problems of long start-up time in low temperature period, and achieve simple operation process, shorten start-up time, and key parameters clear effect

Active Publication Date: 2022-07-01
NORTH CHINA MUNICIPAL ENG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of too long start-up time in the low temperature period, it is necessary to develop and design a method to realize the rapid start-up of denitrification in the low temperature period of the deep bed filter, so as to provide support for design and project operation

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  • A method for realizing rapid start of denitrification in low temperature period of deep bed filter
  • A method for realizing rapid start of denitrification in low temperature period of deep bed filter

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0025] When the water temperature drops to 20 °C, the deep bed filter starts the carbon source dosing system, and the carbon source is initially added according to the externally added COD concentration of 20-30 mg / L. After the operation is stable, the COD and nitrate nitrogen in the filter inlet and outlet water According to the test results, the concentration of the carbon source is adjusted accurately, and the COD of the external carbon source is controlled to not be lower than 20mg / L. After 7 to 10 days, the denitrification is completed and the initial denitrification filming of the first stage is started in advance;

[0026] Starting from the end date of the first stage, the denitrification function is maintained in the second stage. When the filter only needs to perform the filtering function for more than 20-25d of the set carbon source start-up period, 20-25d is used as a start-up period. Add carbon source to the filter, the concentration of COD of carbon source is 5-10...

Embodiment approach 2

[0029] When the water temperature drops to 20 °C, the deep bed filter starts the carbon source dosing system, and the carbon source is initially added according to the externally added COD concentration of 20-30 mg / L. After the operation is stable, the COD and nitrate nitrogen in the filter inlet and outlet water According to the test results, the concentration of the carbon source is adjusted accurately, and the COD of the external carbon source is controlled to not be lower than 20mg / L. After 7 to 10 days, the denitrification is completed and the initial denitrification filming of the first stage is started in advance;

[0030] Starting from the end date of the first stage, enter the second stage of denitrification function maintenance, the filter only needs to perform the filtering function for less than 20 to 25 days after the set carbon source start-up period, end the second stage and enter directly into denitrification. Recovery starts the third stage.

[0031] When ente...

experiment example

[0033] The present invention and the traditional deep bed filter denitrification start-up method were compared in parallel, and a simulation device of a deep bed filter of a city sewage treatment plant in the north was established. The filter influent is the sedimentation tank effluent. Table 1, the operating parameters of the present invention and the traditional deep bed filter denitrification start-up method are shown in Table 2.

[0034] Table 1 Influent water quality of deep bed filter

[0035] project COD(mg / L) NO 3 - -N(mg / L)

The first stage 10.9-14.5 7.8-9.5 second stage 9.9-22.7 8.5-9.4 The third phase 9.1-16.1 10-14.2

[0036] Table 2 Operational parameters of the present invention and traditional deep bed filter denitrification start-up method

[0037]

[0038] Effluent NO from the filter 3 - -N is 9.5mg / L as the set target. The stable time and effect of denitrification in the low temperature period of the two start...

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Abstract

A method for realizing rapid start-up of denitrification in a low-temperature period of a deep-bed filter, including the first stage of denitrification in advance, the second stage of denitrification function maintenance, and the third stage of resumption of denitrification in the low-temperature period, the denitrification in advance of the first stage. The first stage is to add a certain concentration of carbon sources during the set normal temperature period to achieve initial denitrification and film formation. The second stage of maintaining the denitrification function starts on the end date of the first stage of denitrification in advance, according to the set The carbon source dosing system is started periodically, and the third stage of the denitrification low temperature period is to continue to start the carbon source dosing system when the denitrification function needs to be exerted in the low temperature period in winter, until the denitrification reaches a stable level and enters the denitrification process. Nitrification stabilization stage. This method can significantly shorten the start-up time of denitrification in the low temperature period.

Description

technical field [0001] The invention belongs to the technical field of advanced sewage treatment, and in particular relates to a method for realizing rapid start-up of denitrification in a low temperature period of a deep bed filter. Background technique [0002] The deep bed filter with denitrification function is designed, which can meet the requirements of effluent water quality. The deep bed filter only removes suspended solids and converts it into a carbon source to simultaneously play the role of denitrification. It is used in urban sewage treatment plants in my country. It has been widely used in the advanced treatment process. In actual operation, due to the optimization of biological secondary treatment, the total nitrogen concentration of the effluent can basically meet the requirements of Class A of the Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB18918-2002), and most of our countries have denitrification functions. The deep bed filter does n...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
CPCC02F3/286C02F3/2806C02F2209/02C02F2305/06C02F2209/08C02F2209/15C02F2301/10C02F2209/44
Inventor 张玲玲尚巍陈轶顾淼游佳张维李鹏峰
Owner NORTH CHINA MUNICIPAL ENG DESIGN & RES INST