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Method for treating lignite upgrading wastewater by virtue of micro-aerobic co-metabolism

A treatment method and co-metabolism technology, which is applied in the field of lignite upgrading wastewater treatment, can solve the problems that organic pollution components cannot be completely mineralized, bacteria are difficult to adapt to wastewater, and microbial proliferation is difficult, so as to improve biological treatment effect and strengthen biological Effects of processing power and shortened start-up time

Inactive Publication Date: 2015-04-08
JILIN JIANZHU UNIVERSITY +1
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Problems solved by technology

[0004] The purpose of the present invention is to solve the difficulty in starting the conventional micro-aerobic process to treat lignite upgrading wastewater, the difficulty in adapting the bacteria to the wastewater, and the inability to completely mineralize many organic pollutants, which lead to the difficulty in microbial proliferation and the treatment effect. lower problems, and then provide a micro-aerobic co-metabolism method for degrading lignite upgrading wastewater

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  • Method for treating lignite upgrading wastewater by virtue of micro-aerobic co-metabolism

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specific Embodiment approach 1

[0009] Specific implementation mode one: this implementation mode is a micro-aerobic co-metabolism method for degrading lignite upgrading wastewater, which is specifically completed according to the following steps:

[0010] ① Select lignite upgrading wastewater, which is collected by the lignite upgrading process, cooled and precipitated in the intermediate sedimentation tank, and then undergoes demulsification, coagulation, and sedimentation treatment. The water quality is as follows: COD concentration 1250~1500mg / L, BOD 5 The concentration is 300~350mg / L, the total phenol concentration is 70~80mg / L, the ammonia nitrogen concentration is 70~90mg / L, and the total phosphorus concentration is 3~4mg / L.

[0011] ② Use the return sludge from the secondary settling tank of the urban sewage treatment plant as the seed sludge to start the microaerobic activated sludge reactor. The dosage of inoculum sludge is 4~6g / L.

[0012] ③Using trehalose as the first co-metabolism s...

specific Embodiment approach 2

[0018] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the lignite upgrading wastewater in step 1 is collected from the lignite upgrading process and treated by cooling and sedimentation in the intermediate sedimentation tank. The water quality is as follows: COD concentration 2800~ 3300mg / L, BOD 5 The concentration is 500~600mg / L, the total phenol concentration is 90~110mg / L, the ammonia nitrogen concentration is 70~90mg / L, the total phosphorus concentration is 9~13mg / L, and the cyanide concentration is 0.75~1.25mg / L. same.

specific Embodiment approach 3

[0019] Specific embodiment three: The difference between this embodiment and specific embodiment one or two is that in step ②, the initial inoculated sludge dosage in the micro-aerobic activated sludge reactor is 5.5g / L, and other specific implementations Way 1 or 2 are the same.

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Abstract

The invention discloses a method for treating lignite upgrading wastewater by virtue of micro-aerobic co-metabolism and relates to a method for treating coal chemical engineering wastewater. The method is used for solving the problems of difficulties in starting and proliferation of microbes in the conventional micro-aerobic process for treating lignite upgrading wastewater. The method comprises the following main steps: selecting lignite upgrading wastewater; by adopting returned sludge from a secondary sedimentation tank of an urban sewage treatment plant as inoculation sludge and using trehalose as a first substrate for co-metabolism, controlling the ratio of the concentration (COD equivalent weight) of added trehalose to the COD concentration of to-be-treated lignite upgrading wastewater at 0.1-1.0; maintaining the COD sludge load at 0.3-1.0kgCOD / (kgMLSS.d) at the hydraulic retention time of 6-24 hours and the superficial gas velocity of 0.09-0.15cm / s; and controlling stable industry and mining. According to the method, by adopting trehalose as the first substrate for treating lignite upgrading wastewater by virtue of micro-aerobic co-metabolism, the biodegradability of the lignite upgrading wastewater is greatly improved and the starting time of a reactor is shortened. After the reactor stably operates, the removal rate of COD in the lignite upgrading wastewater treated by micro-aerobic co-metabolism can reach above 70% and the removal rate of the total phenol can reach 80-90%.

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] As a kind of coal, lignite is rich in resources in my country, ranking third in the world, mainly distributed in Inner Mongolia, Northeast China, Yunnan and other places. The degree of coalification of lignite is between peat and bituminous coal, with high moisture content, low calorific value, easy weathering and spontaneous combustion, which is not conducive to long-distance transportation and storage, the thermal efficiency of direct combustion is low, and the emission of greenhouse gases is large. The liquefaction, dry distillation and gasification of raw materials all need to reduce the moisture in coal to less than 10%. Therefore, if lignite is not upgraded, it will be difficult to use it efficiently. There are many ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/00C02F3/1215C02F9/00C02F2103/34C02F2301/08
Inventor 王晓玲韩相奎汤洁褚腊林宋铁红李娜殷宝勇李静文
Owner JILIN JIANZHU UNIVERSITY
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