Method for performing biological denitrification nitrogen removal by taking LDHs as slow-release carbon source

A slow-release carbon source and denitrification technology, applied in the field of microbial water treatment, can solve the problems of insufficient or excessive carbon source addition, increased sewage treatment cost, complicated system operation, etc., so as to solve the problem of secondary pollution and avoid secondary pollution. Pollution problems, the effect of improving the denitrification rate

Active Publication Date: 2015-12-30
SHANGHAI YOULIAN ZHUYUAN FIRST SEWAGE TREATMENT INVESTMENT DEV CO LTD
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Problems solved by technology

Methanol, glucose, etc. are often added to sewage as supplementary carbon sources to ensure high nitrogen removal efficiency. However, adding these carbon sources not only increases the cost of sewage treatment, but also makes it difficult to control the process of carbon source addition, resulting in insufficient carbon source addition. Or excessive, but also cause complex system operation and secondary pollution problems

Method used

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Embodiment Construction

[0014] Preferred embodiments of the present invention are described in detail as follows:

[0015] In this embodiment, a method of using LDHs as a slow-release carbon source to carry out biological denitrification denitrification, the steps are as follows:

[0016] (1) Add 0.05mol AlCl to a clean beaker filled with 500mL deionized water 3 ·6H 2 O and 0.15molMgCl 2 ·6H 2 O, transferred to a 1000ml three-neck flask, exposed to nitrogen for 30min, then slowly added 15.7ml of a 50% (w / w) NaOH solution under vigorous stirring, then stirred at 90°C for 12h with nitrogen, and centrifuged the resulting sample. wash, dry;

[0017] (2) Accurately weigh 2.0g of dry sample and disperse it in 500ml of 0.15M NaAc solution, then stir for 6 hours under nitrogen gas at 90°C, centrifuge the obtained sample, repeat the above steps once again after washing, and dry, grind and sieve the final sample Mg with a particle size of 355-600 μm was obtained 0.68 al 0.32 (OH) 2 (CO 3 ) 0.02 (Ac) ...

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Abstract

The invention discloses a method for performing biological denitrification nitrogen removal by taking LDHs as a slow-release carbon source. The layered double hydroxides serve as slow-release carbon source materials of a matrix and can be used as a carbon source supplement in the biological denitrification nitrogen removal process of sewage. The slow-release carbon source materials are composed of the LDHs intercalated with acetate moieties, and the denitrification carbon source which can be controllably and slowly released is synthesized through the anionic exchangeability of the LDHs and the property that the surface carries positive charges. The synthesized slow-release carbon source materials have the good mechanical property and biocompatibility, can gather microorganisms, increase the biomass of the unit area and improve the nitrogen removal rate and are suitable for the biological denitrification process of the sewage with the low carbon nitrogen ratio, the 6-h nitrogen removal efficiency is more than 96 percent, the effluent TOC is smaller than 5.5 mg / L, and the secondary pollution problem caused when an external carbon source is directly put can be effectively avoided. Accordingly, Ac-LDH can become a novel slow-release carbon source material with the great potential.

Description

technical field [0001] The invention relates to a treatment method for nitrogen-containing wastewater, in particular to a sewage biological denitrification denitrification treatment process, which is applied in the technical field of microbial water treatment. Background technique [0002] Nitrogen in sewage is one of the main factors causing water eutrophication. Biological denitrification is an effective method to remove nitrogen in sewage, but it needs sufficient carbon source. The carbon-to-nitrogen ratio of urban sewage in my country is low, and the biological denitrification process of sewage with low carbon-to-nitrogen ratio reduces the denitrification efficiency due to insufficient carbon sources in sewage. With the improvement of sewage discharge standards, the contradiction of insufficient carbon sources in the biological denitrification process has become increasingly prominent. Methanol, glucose, etc. are often added to sewage as supplementary carbon sources to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 刘建勇段腾飞杨潇剑左康朱雪东钱光人
Owner SHANGHAI YOULIAN ZHUYUAN FIRST SEWAGE TREATMENT INVESTMENT DEV CO LTD
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