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Two-point water intake biofilter and method for inhibiting generation of dissolved organic nitrogen by using same

A technology of dissolved organic nitrogen and aquatic organisms, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as health risks, achieve average effects, and reduce organic nitrogen. generated effect

Active Publication Date: 2015-02-11
天津同瑜环保节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-concentration dissolved organic nitrogen is more likely to generate disinfection by-products, especially nitrogen-containing disinfection by-products (N-nitrosodimethylamine), during chlorine disinfection, which poses health risks to the public.

Method used

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  • Two-point water intake biofilter and method for inhibiting generation of dissolved organic nitrogen by using same
  • Two-point water intake biofilter and method for inhibiting generation of dissolved organic nitrogen by using same
  • Two-point water intake biofilter and method for inhibiting generation of dissolved organic nitrogen by using same

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Effect test

Embodiment

[0023] Biological filter of the present invention's dual-point water intake mode of the present invention, such as image 3 As shown, the biological filter includes a filter body 1, the top of the filter body 1 is provided with a first water inlet 6, the bottom of the filter body 1 is provided with a water outlet 2, and the inside of the filter body 1 is provided with Filter material layer 4, below the filter material layer 4, there is a support layer 3 for filtering and supporting the filter material layer (the support layer is generally composed of pebbles or large grains of coarse sand, etc., to prevent the loss of filter material) , the height of the filter material layer 4 is 100-120cm; a water distributor 5 is provided at a distance of 10-20cm from the top of the filter material layer 4, and the water distributor 5 is connected with a second water inlet 7 on the same horizontal plane; The above-mentioned first water inlet 6 and second water inlet 7 are respectively arran...

Embodiment 2

[0027] Taking activated carbon-quartz sand as an example in the double-layer filter material filter, the effect of controlling DON of the biofilter column with different water inlet methods is compared. DON change map along the biofilter ( figure 2 ) can be seen in the single-point water intake mode, the DON drops the most in the 0-20cm filter layer, and then, with the decrease of dissolved oxygen and pH, the concentration of bioavailable organic matter decreases, and the microorganisms gradually enter the stage of decreasing growth rate and internal During the source respiration stage, the DON released by microorganisms increased sharply. Compared with the single-point water intake method, the double-point water intake can provide the dissolved oxygen required by microorganisms to the lower layer, prolong the weak alkaline environment and richer bioavailable organic matter. These favorable conditions delay the time for microorganisms to enter the stage of growth rate declin...

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Abstract

The invention discloses a two-point water intake biofilter which comprises a filter body, wherein a first water inlet is formed in the top part of the filter body; a water outlet is formed in the bottom of the filter body; a filtering material layer is arranged inside the filter body; a support layer is arranged below the filtering material layer; the height of the filtering material layer is 100-120cm; a water distributor is arranged at the part 10-20cm away from the top part of the filtering material layer; a second water inlet is communicated with the water distributor on one same plane; the first water inlet and the second water inlet are respectively formed on left and right sides of the filter body; the water intake amount ratio of the first water inlet to the second water inlet is (2-2.5):1. According to the filter, two-point water intake is adopted, so that the effect in controlling DON (dissolved organic nitrogen) of discharged water of the filter is greatly superior to that of an ordinary sand filter in a single point water intake mode and that of an activated carbon-quartz sand double-layer filter in the single point water intake mode. The reason is that the change of a microenvironment after raw water is filled through the second point is applicable to activity of microorganisms, and the improvement of the microorganism activity is beneficial for reducing and inhibiting the generation of the dissolved organic nitrogen.

Description

technical field [0001] The invention belongs to the technical field of drinking water treatment, in particular to a dual-point water inflow biological filter and a method for inhibiting the generation of dissolved organic nitrogen. Background technique [0002] Dissolved organic nitrogen (DON) in drinking water is composed of a series of compounds containing various nitrogen-containing functional groups. In the process of chlorine disinfection of drinking water, chlorine can undergo addition and substitution reactions with organic substances to produce a variety of conventional halogenated organic substances that are toxic and harmful to the human body, and can also react with dissolved organic nitrogen to form nitrogen-containing disinfection by-products Such as halogenated nitromethane, halogenated acetonitrile, halogenated acetamide and non-halogenated nitrosamine compounds. These nitrogen-containing disinfection by-products are more carcinogenic to humans than conventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34
Inventor 张会宁于鑫张科锋靳慧霞古励
Owner 天津同瑜环保节能科技有限公司
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