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Method for treating lignite quality-improving waste water through aerobic cometabolism

A technology of co-metabolism and coal chemical wastewater, applied in the direction of aerobic process treatment, mining wastewater treatment, sustainable biological treatment, etc., can solve the problem of limited microbial species, increased difficulty and load of advanced treatment, and efficiency of lignite upgrading wastewater biological treatment process Low-level problems, to achieve the effect of improving treatment efficiency and biological treatment effect

Inactive Publication Date: 2015-03-25
JILIN JIANZHU UNIVERSITY +1
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Problems solved by technology

However, because some organic substances in lignite upgrading wastewater cannot be used as microbial nutrient substrates, or the types of microorganisms that can directly use this substance as nutrient substrates are limited, not only the effluent from the anaerobic reactor contains such pollutants, but also enters the aerobic environment. After the reactor, such substances still cannot be completely degraded, which leads to low efficiency of the biological treatment process of lignite upgrading wastewater and increases the difficulty and load of subsequent advanced treatment. Therefore, how to remove them in the aerobic reactor cannot be directly used as microbial nutrition. The key to economical and effective treatment of lignite upgrading wastewater is to increase the number of microbial flora that can degrade such substances or to increase the number of microbial flora that can degrade such substances.

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  • Method for treating lignite quality-improving waste water through aerobic cometabolism
  • Method for treating lignite quality-improving waste water through aerobic cometabolism

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specific Embodiment approach 1

[0010] Specific implementation mode one: this implementation mode is the method for anaerobic co-metabolism treatment of lignite upgrading wastewater, which is specifically completed according to the following steps:

[0011] ①Select lignite upgrading wastewater, which is collected from the lignite upgrading process, and after cooling and sedimentation in the intermediate sedimentation tank, the following process is used: adding demulsifier and flocculant, after demulsification, coagulation, and sedimentation treatment The final supernatant water is lifted to the anaerobic reactor by a peristaltic pump for anaerobic hydrolysis and acidification treatment, and the effluent from the anaerobic reactor is the lignite upgrading wastewater to be treated. The water quality is as follows: COD concentration 950~1200mg / L, BOD 5 The concentration is 350~400mg / L, the total phenol concentration is 70~90mg / L, the ammonia nitrogen concentration is 55~70mg / L, and the total phosphorus concentr...

specific Embodiment approach 2

[0019] Specific embodiment two: the difference between this embodiment and specific embodiment one is that step 3. in, the COD volume load of aerobic reactor is 1.2 kgCOD / (m 3 ·d) or 1.5kgCOD / (m 3 d), the hydraulic retention time is 20h or 24h, and the others are the same as the specific embodiment one.

specific Embodiment approach 3

[0020] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step 4., the initial inoculation sludge dosage in the aerobic reactor is 5g / L, other and specific embodiment one or two same.

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Abstract

The invention relates to a method for treating lignite quality-improving waste water through aerobic cometabolism, relating to a method for treating coal chemical industry waste water and solving the problems of poor removal effect of an aerobic reactor on a pollutant component which can not be directly used as a microbe nutrient substance or smaller quantity and poorer flora function of microbe florae capable of degrading the substance. The method comprises the following main steps of selecting the lignite quality-improving waste water; selecting trehalose as a first substrate used for the cometabolism, wherein the addition amount of the trehalose is regulated and controlled by an automatic addition system; and by taking return sludge of a secondary sedimentation tank of an urban sewage plant as inoculated sludge, keeping the hydraulic retention time of the aerobic reactor at 18-24 hours, and controlling a stable working condition. According to the method, the trehalose is taken as the first substrate, so that an organic substance which can not be taken as an aerobic microbe direct substrate can be degraded or the growth and propagation of an aerobic microbe which takes the substance as the substrate are intensified; after the operation is stable, the COD removal ratio of the lignite quality-improving waste water subjected to aerobic treatment can achieve more than 85%, and the total phenol removal ratio can achieve more than 80%.

Description

technical field [0001] The invention relates to a method for treating lignite upgrading wastewater, which belongs to the technical fields of municipal engineering, environmental engineering and chemical wastewater treatment. Background technique [0002] Lignite upgrading wastewater mainly comes from the high-temperature wastewater discharged from the leaching pretreatment section of the lignite upgrading process by leaching and evaporation. The lignite wastewater has a wide variety of components and a high concentration of pollutants, among which the inorganic pollutants mainly include: ammonia nitrogen, S 2- 、CN - ; There are 37 kinds of organic substances, including humic acid, phenols, long-chain alkanes, naphthalene, imidazole, benzofuran, pyrazole, etc. Most of these components are toxic and harmful substances with high biological toxicity, which seriously threatens environmental safety. Therefore, how to treat lignite upgrading wastewater economically and efficient...

Claims

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Application Information

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IPC IPC(8): C02F3/02C02F3/34C02F9/14
CPCC02F3/02C02F3/34C02F9/00C02F2101/105C02F2101/16C02F2101/345C02F2103/10Y02W10/10
Inventor 王晓玲汤洁韩相奎
Owner JILIN JIANZHU UNIVERSITY
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