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Phenol inhibition-coupled low temperature short-cut denitrification method
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A phenol and short-range technology, which is applied in the field of short-range denitrification process under low temperature conditions, can solve the problem of whether the treatment effect of new pollution is stable, and achieve the effect of ensuring sewage treatment performance and strong impact resistance
Active Publication Date: 2013-07-10
中山公用水务投资有限公司
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At present, although chemical plants have set up corresponding phenol water treatment processes, such as adsorption method, extraction method, membrane filtration, electrochemical catalysis, anaerobic treatment, etc., the treatment effect, whether there is new pollution, and whether the operation is stable are all to be considered. question
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Embodiment example 1
[0036] The volume of the reactor is 5L, and the raw water comes from domestic sewage in a living quarter.
[0037] COD=190-270mg / L, NH 4 + -N=50~69mg / L, pH=7.20-7.80. The inoculum sludge was taken from the return sludge of the secondary settling tank of an urban sewage treatment plant in Beijing, which is a sludge with good nitrification performance throughout the process. At each stage, the sludge concentration in the sludge control system is maintained at the set level, and the DO is maintained at 0.5-1.3mg / L. During the implementation process, the temperature gradually decreases from 25°C to 15°C as the temperature decreases.
[0038] 1. The concentration of phenol is 0mg / L, 15mg / L, 30mg / L: the concentration of inoculated sludge is 3000mg / L, after 15 days of operation, the temperature gradually changes from 25°C to 19°C, and the effluent COD=32-54mg / L, NH 4 + -N2 - -N=2-4mg / L; NO 3 - -N=15-20mg / L; NO 2 - -N / NO 3 - The -N value is maintained between 9% and 22%, wi...
Embodiment example 2
[0043] The volume of the reactor is 10L, and the raw water comes from domestic sewage in a residential area.
[0044] COD=206~260mg / L,NH 4 + -N=51~70mg / L, pH=7.43-8.13. The inoculum sludge was taken from the secondary sedimentation sludge of a pilot reactor with good denitrification effect. At each stage, the sludge concentration in the sludge control system is maintained at the set level, DO is maintained at 0.5-1.3mg / L, and the temperature is gradually reduced from 25°C to 15°C during the implementation process.
[0045] 1. The concentration of phenol is 0-30mg / L: the concentration of inoculum sludge is 3000mg / L. After 15 days of operation, the temperature gradually changes from 25°C to 19°C, and the effluent COD=39-51mg / L, NH 4 + -N2 - -N=1-5mg / L; NO 3 - -N=17-23mg / L; NO 2 - -N / NO 3 - The -N value is between 5% and 15%, and the nitrous accumulation rate changes little.
[0046] 2. Phenol concentration 60mg / L: After 15 days of operation, the temperature gradually...
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Abstract
A phenol inhibition-coupled low temperature short-cut denitrification method belongs to the field of sewage treatment. The pre-denitrification operation mode of a sequencing batch reactor (SBR) is adopted, raw water and phenol compound are sufficiently utilized as carbon source, and additional carbon source is not added. When the temperature is linearly decreased to 15 DEG C from 25 DEG C and thephenol concentration is 0mg / L to 30mg / L, the system does not discharge sludge; when the phenol concentration is 60mg / L, the sludge concentration is kept at 4000mg / L; and when the phenol concentrationis 90mg / L, the sludge concentration is kept at 5000mg / L. The increase of the nitrite accumulation rate under low-concentration phenol is slow, and the nitrite accumulation rate is less than 5 percentwhen the phenol concentration is 0mg / L, reaches 22 percent at the final stage when the phenol concentration is 30mg / L, and is 43 percent at the final stage when the phenol concentration is 60mg / L; the affection of high-concentration phenol on the composition of system sludge is great, and the nitrite accumulation rate reaches 91 percent and is stably kept at more than 90 percent at the final stage. The method is applicable to industrial wastewater treatment in cold northern regions and can be adopted as a technical reference for the inhibition of the toxicity of phenolic compounds in urban sewage.
Description
technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a start-up method for short-range nitrification of wastewater containing phenol and nitrogen, especially a short-range denitrification process under low temperature conditions, which is suitable for industrial wastewater treatment and urban sewage phenol in colder northern regions A technical reference for the inhibition of compound toxicity. Background technique [0002] The denitrification process of sewage biological treatment is divided into whole-process nitrification and denitrification and short-term nitrification and denitrification. Among them, short-cut nitrification and denitrification has attracted more and more attention due to its unique advantages: energy consumption is reduced by 25%, organic carbon source is reduced by 40%, reaction time is shortened by 63%, sludge production is reduced by 50%, and the volume of denitrification It can be red...
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