BAF (biological aerated filter), construction method thereof and method for treating water by using BAF constructed with method

The invention relates to a technology of an aerated biological filter and a construction method, which are applied in the field of using a double-layer aerated biological filter to domesticate low-temperature nitrifying bacteria to pretreat ammonia nitrogen in water source water, and can solve the problem of poor ammonia nitrogen removal effect, aggravated ammonia nitrogen pollution of water source water, and unstable operation. And other issues

Active Publication Date: 2018-01-16
北京市自来水集团有限责任公司技术研究院 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for constructing a low-temperature domesticated aerated organism in view of the existing low-temperature period of water plant water source water ammonia nitrogen pollution aggravated, drinking water biological treatment process has poor ammonia nitrogen removal effect in the low-temperature period, unstable operation and other technical problems. The method for the filter tank, the biological aerated filter tank constructed and the method for treating the water source water of drinking water by the filter tank constructed by the method

Method used

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  • BAF (biological aerated filter), construction method thereof and method for treating water by using BAF constructed with method
  • BAF (biological aerated filter), construction method thereof and method for treating water by using BAF constructed with method
  • BAF (biological aerated filter), construction method thereof and method for treating water by using BAF constructed with method

Examples

Experimental program
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Embodiment 1

[0081] Example 1 Stable light packing-zeolite double-layer biological aerated filter at room temperature

[0082] The inner diameter of the double-layer biological aerated filter is 100mm, wherein: the height of the buffer water distribution area in the lower layer of the filter is 0.2m; the lower filter layer is a light filler (polyethylene) layer with a height of 1m (usually 1-2.5m, preferably 1- 1.5m, in the embodiment of the present invention, take 1m as an example), the filling rate of light filler is 80% (usually 80-90%), and the bulk density is 150kg / m 3 The porous filter plate interlayer is composed of a porous filter plate and a pebble layer with a particle size of 3-6mm fixedly placed on its upper part, with a height of 0.2m, and is laid from bottom to top in order of particle size from large to small; the upper filter layer It is a zeolite filter layer, the particle size of zeolite is 1-3mm, and the filling height of zeolite is 1m (usually 1-1.5m, preferably 1-1.2m,...

Embodiment 1A

[0091] In situ domestication of embodiment 1A low temperature nitrifying bacteria

[0092] Water quality of source water to be treated:

[0093]

[0094]

[0095] In this embodiment, the ammonia nitrogen concentration of the source water to be treated is 1.7 mg / L as an example for illustration, and other source waters of ≤4 mg / L are applicable to the present invention.

[0096] In the stable double-layer biological aerated filter (light filler-zeolite double-layer biological aerated filter) in Example 1, under the condition that the temperature is maintained at 3°C ​​(usually at 1-5°C), the The source water to be treated flows into the water distribution area from the bottom of the double-layer biological aerated filter through the water inlet pipe, and runs upward; aeration, the air-water ratio is 2.5:1 (usually 2:1~3:1), hydraulic retention The time is 60 minutes (usually 30-60 minutes), the gas and water mixed flow successively pass through the lower layer of light p...

Embodiment 2

[0100] The rapid domestication of embodiment 2 low temperature nitrifying bacteria

[0101] 1. Prepare backwash concentrate

[0102]In embodiment 1, in the process of carrying out backwashing to the lightweight filler-zeolite double-layer biological aerated filter with stable operation, the backwashing water is collected, and the ratio of the amount of backwashing water to the volume of the filter tank is 2.5:1 ( Usually 1.5-3:1); Then, the collected backwash water is left standing at room temperature (20-30°C) for 20-30min, the supernatant is removed, and the lower backwash concentrate is obtained, wherein the backwash concentrate is mixed with The volume ratio of the collected backwash water is 10:100 (usually 10-20:100).

[0103] The backwashing of the biofilter in the present invention is described by taking air flushing first, followed by air-water combined flushing, and then water flushing as an example, and other backwashing methods are also applicable to the present i...

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Abstract

The invention relates to a construction method of a BAF (biological aerated filter), the BAF and a method for treating water by using the BAF. The construction method comprises the steps as follows: backwashing water of the BAF is collected and concentrated at the low temperature, then, the concentrated solution is subjected to primary low-temperature acclimation culture, and a proliferation culture solution is obtained; the proliferation culture solution is added to the BAF for airtight aeration treatment; then, source water is introduced into the BAF for secondary low-temperature acclimationculture. In the constructed BAF, the ecological niche advantage of low-temperature nitrifying bacteria in the system is outstanding, and ammonia-nitrogen pollution to the source water at the low temperature stage is effectively controlled. The BAF is stable in operation, low in energy consumption, applicable to both low temperature stage and normal temperature stage and high in ammonia nitrogen removal rate; the BAF is applicable to treatment of source water with ammonia and nitrogen as main pollutants at the low temperature and the treatment safety of drinking source water is guaranteed. Theproblem of high difficulty in removing ammonia and nitrogen with a drinking water treatment process in winter, particularly at the low temperature in the north is solved.

Description

technical field [0001] The invention relates to a method for treating source water, in particular to a method for pretreating ammonia nitrogen in source water by using a double-layer aerated biological filter to domesticate low-temperature nitrifying bacteria. Background technique [0002] BAF-Biological Aerated Filters (BAF-Biological Aerated Filters), also known as Submerged Biological Aerated Filters (SBAF-Submerged Biological Aerated Filters), is used in ordinary biological filters, high-load biological filters, biological filter towers, and biological contact oxidation methods. Developed on the basis of the biofilm method, it is called the third generation biofilter (The Third Generation Filter), which has the functions of removing SS, COD, BOD, nitrification, denitrification, phosphorus removal, and removal of AOX (harmful substances). effect. Biological aerated filter is a new process integrating biological oxidation and interception of suspended solids. Foreign cou...

Claims

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Application Information

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IPC IPC(8): C02F3/02C02F3/10C02F3/34C02F101/16
CPCY02W10/10
Inventor 韩梅曹曦催福义
Owner 北京市自来水集团有限责任公司技术研究院
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