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A kind of composite filler of biological aerated filter and its application

A technology of biological aerated filter and combined packing, which is applied in the field of water treatment, can solve the problems of long film-hanging time, collapse of packing column, high price, etc., and achieve the effects of fast film-hanging speed, strong supporting effect and wide sources

Active Publication Date: 2018-03-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon is used as a filler, which is expensive, and the agitation of the gas and aqueous solution in the activated carbon biological aerated filter makes the activated carbon biological filter effluent color darker, resulting in an increase in the turbidity of the effluent, which is even greater than the turbidity of the influent water; zeolite as aeration Biofilter packing, due to its irregular shape, large water flow resistance, easy to block, difficult to distribute water and air evenly
The surface of zeolite has a negative charge, which is not conducive to the growth of microbial film formation when used alone as a biological aerated filter filler; walnut shells as a biological aerated filter filler require a long time to form a film, and due to microbial decomposition, the filler after long-term operation Column collapsed

Method used

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  • A kind of composite filler of biological aerated filter and its application
  • A kind of composite filler of biological aerated filter and its application
  • A kind of composite filler of biological aerated filter and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The walnut shell and zeolite are mixed in a volume ratio of 3:1 and applied to the biological aerated filter.

[0037] 1. The start-up and operation effect of the biological aerated filter with membrane

[0038] (1) COD concentration and its removal rate during the start-up of film formation

[0039] From figure 1It can be seen from the figure that the COD removal rate of the biological aerated filter is about 60% at the initial stage of continuous water inflow during the start-up period of the film hanging, and when the continuous reaction reaches the fifth day, the COD removal rate rapidly increases from 61.5% of the previous day to 90%. When the influent organic matter concentration (COD) was in the range of 218.4mg / L-353.9mg / L, COD maintained a high removal rate (61.5%-94%). It can also be seen that, except for the special circumstances of a few days, the COD removal rate generally increases with time, and in the late start-up period, even if the influent COD con...

Embodiment 2

[0056] Mix walnut shells and zeolite in a volume ratio of 2:1 as the filler of the biological aerated filter, and start operation in the same manner as in Example 1. The monitoring results show that it takes 23 days for the biological aerated filter to successfully form a membrane at this time, and the COD and NH 4 + The removal rates of -N were 73.3%-87.5% and 63.2%-77.4%, respectively.

Embodiment 3

[0058] Walnut shells and zeolite are mixed evenly as the biological aerated filter filler in a volume ratio of 4:1, and start operation in the same manner as in Example 1. The monitoring results show that it takes 27 days for the biological aerated filter to successfully form a film at this time. COD and NH 4 + The removal rates of -N can reach 71.8%-89.6% and 65.1%-80.6%, respectively.

[0059] The biological aerated filter composite filler of the present invention, compared with other fillers, has a fast film-hanging speed under the same conditions, and only needs more than 20 days for film-hanging success; 4 + -N) good removal effect,

[0060] In addition, the filler is common agricultural waste with wide sources and low price, and is suitable for mass use.

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Abstract

The invention discloses combined packing for a biological aerated filter. The combined packing is composed of walnut shells and zeolite in a volume ratio of (2-4) : 1. The invention further discloses an application of the combined packing in the biological aerated filter. The combined packing for the biological aerated filter disclosed by the invention is fast in biofilm culturing speed in a same condition compared with other packing. The walnut shells and the zeolite are combined as the combined packing for the biological aerated filter, and therefore, the porosity, the adsorbability, the ion-exchange property and a relatively strong supporting effect of the zeolite are exerted; and the walnut shells are used as a solid carbon source so that no additional carbon source is needed, and the walnut shells further have a certain framework supporting effect, so that the combined packing is not prone to blockage. In addition, the walnut shells as an agricultural solid waste are wide in source and low in price.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a combined filler for an aerated biological filter, and also relates to the application of the combined filler in an aerated biological filter. Background technique [0002] In recent years, due to the improvement of human living standards and the excessive use of agricultural chemical fertilizers, a large amount of nitrogen-containing domestic sewage and industrial wastewater have been discharged into water bodies. Nitrogen is the main factor causing eutrophication of water bodies and can be transformed into "three causes" The substance nitrite seriously threatens human health. Therefore, the research and development of economical and efficient wastewater denitrification treatment technology has become the focus and hot spot in the field of water pollution control engineering. Among the many denitrification technologies, the biological aerated filter (BAF) i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/10
CPCY02W10/10
Inventor 丁绍兰谢林花封香香齐泽宁杨倩
Owner SHAANXI UNIV OF SCI & TECH
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