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Device and method for starting and maintaining short-cut nitrification by alternate side treatment of hydroxylamine and free nitrite

A short-range nitrification and treatment device technology, applied in biological treatment devices, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of high cost of hydroxylamine, AOB impact, and inability to achieve long-term maintenance, etc., to achieve NOB inhibition and small inhibition , to maintain the effect of running for a long time

Active Publication Date: 2021-11-09
BEIJING UNIV OF TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to previous studies, mainstream dosing of hydroxylamine and FNA have strong inhibitory effects on Nitrospira and Nitrobacter in NOB respectively, but since both are reversible inhibitory effects, it is impossible to achieve long-term maintenance by adding one alone.
At the same time, when the concentration of hydroxylamine and FNA is high, it will affect AOB, and the cost of hydroxylamine is high, so a new method is needed to maintain the operation of short-range nitrification

Method used

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  • Device and method for starting and maintaining short-cut nitrification by alternate side treatment of hydroxylamine and free nitrite

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Effect test

Embodiment Construction

[0020] refer to figure 1 The test device shown in the figure follows the steps below to maintain long-term stable short-range nitrification of urban sewage:

[0021] 1) Full-process nitrification start: use the full-process nitrification sludge of the actual urban sewage treatment plant as inoculation sludge to inject into SBR (2), the concentration is 3000-5000mg / L; use artificially synthesized wastewater as raw water, initial NH 4 + -N concentration is 40-60mg / L, inject SBR through the raw water inlet pump (1.2), and the water inlet time is 5 minutes; run the SBR stirring device (2.1) to achieve full mixing of mud and liquid, and the stirring time is 10 minutes; start the aeration pump ( 2.2) Aerate domestic sewage for 60 minutes, keep DO at 1-2mg / L, and maintain pH at 6.5-8.5; after settling for 30 minutes, drain for 5 minutes, the SBR drainage ratio is 0.3-0.5, and discharge the supernatant into the effluent pool (7); The reactor runs 6 cycles every day, and there is an ...

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Abstract

The invention discloses a device and a method for starting and maintaining short-cut nitrification by alternate side treatment of hydroxylamine and free nitrite, and belongs to the field of sewage treatment. The device comprises a raw water tank, a sequencing batch reactor (SBR), a side treatment reactor and an automatic control system. The method comprises the following steps that: after a reactor starts whole-course nitrification, hydroxylamine with a certain concentration is added into a side reactor to treat sludge so as to promote the activity of ammonia oxidizing bacteria (AOB) and inhibit Nitrospira in nitrite oxidizing bacteria (NOB), then the sludge flows back to a mainstream reactor in batches, and short-course nitrification is started; then, FNA is added into the side reactor, the FNA has a relatively strong inhibition effect on Nitrobacter, and short-cut nitrification is consolidated; and the long-term maintenance of short-cut nitrification is realized by alternately adding hydroxylamine and FNA in the later stage. Short-cut nitrification can be started, the nitrite accumulation rate is high, and long-time operation is maintained. The device and the method have the advantages of quick starting, long-term nitrite supply and the like.

Description

technical field [0001] The invention relates to a device and method for starting and maintaining short-range nitrification through alternate side treatment of hydroxylamine and nitrite, which belongs to the field of sewage biological treatment and is suitable for biological denitrification of urban domestic sewage, especially the application of short-range nitrification related processes. Background technique [0002] In the process of urban domestic sewage treatment, due to the relatively low carbon and nitrogen in urban domestic sewage, insufficient carbon sources in the whole process of nitrification-denitrification technology will easily lead to incomplete denitrification and affect the efficiency of nitrogen removal, so it is often necessary to add additional carbon sources , and the whole process of nitrification requires long-term aeration, which consumes relatively large energy and does not meet the requirements of sustainable development. [0003] Short-cut nitrific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/12C02F101/38
CPCC02F3/1263C02F1/00C02F2209/005C02F2209/22C02F2209/06C02F2203/006C02F2101/38C02F2209/44C02F2209/36Y02W10/10
Inventor 彭永臻马雨晴王博李笑迪
Owner BEIJING UNIV OF TECH
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