A Coal Chemical Wastewater Biological Treatment System and Treatment Method Based on Sludge Ozone Catalytic Oxidation

A technology for ozone catalytic oxidation and coal chemical wastewater treatment, which is applied in the fields of oxidized water/sewage treatment, water/sludge/sewage treatment, anaerobic digestion treatment, etc. The problem of low rate of sludge digestion can be achieved to achieve the effect of low-cost sludge digestion promotion, beneficial to reduction, and complete sludge digestion.

Active Publication Date: 2021-03-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

CN102617004A discloses a sewage treatment system using self-generating sludge for carbon source development and application, which is characterized in that a broken-wall sludge return pipe is connected between the sludge output port of the secondary settling tank and the water inlet of the biological reaction tank. Ozone sludge breaking device; this device realizes the contact oxidation of ozone and sludge through a gas-water mixer, but the design of the device is simple, the utilization rate of ozone is low, and the treatment cost is high, which is not conducive to practical application
But this device and method also do not solve the problem of efficient utilization of ozone, which is still unfavorable for the engineering application of technology.

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  • A Coal Chemical Wastewater Biological Treatment System and Treatment Method Based on Sludge Ozone Catalytic Oxidation
  • A Coal Chemical Wastewater Biological Treatment System and Treatment Method Based on Sludge Ozone Catalytic Oxidation

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Experimental program
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Embodiment 1

[0093] This embodiment provides a biological treatment system for coal chemical wastewater, which includes a first-stage pre-denitrification anoxic / aerobic biological treatment system, a sludge ozone catalytic oxidation multi-phase reaction system and a second-stage anoxic denitrification / Aerobic biological treatment system;

[0094] Among them, the first-stage sedimentation tank in the anoxic / aerobic biological treatment system with pre-denitrification and the sludge ozone catalytic oxidation reactor in the sludge ozone catalytic oxidation multiphase reaction system are connected through sludge pipelines, and the sludge The clear liquid outlet of the ozone catalytic oxidation reactor in the ozone catalytic oxidation multiphase reaction system and the sewage discharge outlet of the primary sedimentation tank in the anoxic / aerobic biological treatment system of primary pre-denitrification are simultaneously connected with the secondary The liquid inlet of the secondary anoxic...

Embodiment 2

[0101] In this embodiment, the coal chemical wastewater biological treatment system described in Example 1 is used to treat the coal chemical wastewater. The COD content in the coal chemical wastewater to be treated is 3000-8000 mg / L, and the ammonia nitrogen content is 50-300 mg / L.

[0102] The coal chemical wastewater to be treated enters the anoxic / aerobic biological treatment system of the first-level pre-denitrification for the first-level anoxic treatment, the first-level aerobic treatment and the first-level sedimentation treatment. Among them, the first-level anoxic treatment adopts biological Membrane method, the primary aerobic treatment adopts the activated sludge method, the hydraulic retention time in the primary anoxic reactor is 25-30h, the hydraulic retention time in the primary aerobic reactor is 60-70h, and the primary The total hydraulic retention time of the denitrification anoxic / aerobic biological treatment unit is 100-120h.

[0103] The concentration of ...

Embodiment 3

[0108] In this example, the coal chemical wastewater biological treatment system described in Example 1 is used to treat coal chemical wastewater. Except that the hydraulic retention time in the primary anoxic reactor is 40-45h, the hydraulic retention time in the primary aerobic reactor is The residence time is 80-90h, and the total hydraulic retention time of the anoxic / aerobic biological treatment unit of the first-stage pre-denitrification is 130-140h; the flow ratio of the sludge used for backflow and the sludge used for ozone catalytic digestion is 10:1; the ozone generator produces ozone with a concentration of 10-12%, and the dosage of ozone in the sludge ozone catalytic oxidation reactor is 0.05-0.06O 3 / MLSS(g / g), the ozone catalytic digestion time is 20-30min; the hydraulic retention time of the secondary anoxic treatment is 15-20h, and the hydraulic retention time of the secondary aerobic treatment is 10-15h, other operating steps All the same as in Example 2.

[...

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Abstract

The invention provides a coal chemical wastewater biological treatment system based on sludge catalytic ozonation and a treatment method thereof. The system comprises an anoxic / aerobic biological treatment system for first-grade predenitrification, a sludge catalytic ozonation multiphase reaction system and a second-grade anoxic denitrification / aerobic biological treatment system. The method comprises the following steps: subjecting to-be-treated coal chemical wastewater to anoxic / aerobic biological treatment of first-grade predenitrification, subjecting one part of treated sludge to refuxing and the other part of the treated sludge to ozone catalytic digestion, mixing a supernatant generated by ozone catalytic digestion with the sewage obtained by anoxic / aerobic biological treatment of first-grade predenitrification, and subjecting the obtained mixture to second-grade anoxic denitrification / aerobic biological treatment so as to obtain effluent water, wherein tail gas generated by catalytic digestion is used for aeration treatment for second-grade anoxic denitrification / aerobic biological treatment. According to the invention, a sludge catalytic ozonation multiphase reactor is adopted, so highly-efficient and low-cost oxidation digestion of the sludge can be realized, and functions of a novel method are guaranteed to be realized.

Description

technical field [0001] The invention belongs to the field of coal chemical wastewater treatment, and relates to a coal chemical wastewater biological treatment system and a treatment method thereof, in particular to a coal chemical wastewater biological treatment system based on sludge ozone catalytic oxidation and a treatment method thereof. Background technique [0002] Coal chemical industry wastewater is the wastewater generated during the coal chemical production process during high-temperature coal coking, gas purification, coking product recovery and refining. There are many kinds of pollutants in coal chemical industry wastewater with complex components, such as organic pollutants such as phenols, benzene series, nitrogen-containing heterocyclic aromatic hydrocarbons, and polycyclic aromatic hydrocarbons, and toxic inorganic pollutants such as sulfide, rhodanide, and cyanide and high concentrations of ammonia nitrogen. Therefore, in the actual production process, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F11/06C02F103/34
CPCC02F1/78C02F3/28C02F3/302C02F9/00C02F11/06C02F2103/34C02F2209/40C02F2209/44C02F2301/043C02F2301/08C02F2305/00
Inventor 李海波曹宏斌李玉平
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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