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Using ldhs as a slow-release carbon source for biological denitrification and denitrification

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

Active Publication Date: 2017-11-10
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 0.05 mol AlCl to a clean beaker filled with 500 mL deionized water 3 ·6H 2 O and 0.15mol MgCl 2 ·6H 2 O, transferred to a 1000 ml three-neck flask, exposed to nitrogen for 30 min, then slowly added 15.7 ml of 50% (w / w) NaOH solution under vigorous stirring, and then stirred under nitrogen at 90 °C for 12 h, and the obtained Sample centrifugation, washing, drying;

[0017] (2) Accurately weigh 2.0 g of dry sample and disperse it in 500 ml of 0.15 M NaAc solution, then stir for 6 h under nitrogen at 90 °C, centrifuge the obtained sample, repeat the above steps once again after washing, and dry the final sample. Grinding and sieving to obtain Mg with a particle size of 355-600 μm 0.68 Al 0.32 (OH) 2 (CO...

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Abstract

The invention discloses a method for biological denitrification and denitrification by using LDHs as a slow-release carbon source. The slow-release carbon source material with layered double hydroxyl compound metal oxide as a matrix can be used for carbon in the process of biological denitrification and denitrification of sewage. source supplement. The slow-release carbon source material of the present invention is composed of acetate-intercalated LDH, and utilizes the anion exchangeability and positively charged properties of the LDH to synthesize a controllable and slow-release denitrification carbon source. The slow-release carbon source material synthesized by the invention has good mechanical properties and biological affinity, can enrich microorganisms, increase the biomass per unit area, and improve the denitrification rate, and is suitable for the biological denitrification process of sewage with low carbon-to-nitrogen ratio. The 6-hour denitrification efficiency is as high as 96%, and the TOC of the effluent is less than 5.5 mg / L, which can effectively avoid the secondary pollution caused by directly adding additional carbon sources. Therefore, Ac‑LDH will become a new slow-release carbon source material with 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 Patents(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