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Method for treating coking wastewater

A treatment method and technology for coking wastewater, applied in chemical instruments and methods, biological water/sewage treatment, multi-stage water/sewage treatment, etc. Complicated chemical bed structure and other problems, to achieve stable treatment effect, strong impact resistance, and small equipment footprint

Inactive Publication Date: 2011-07-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes have improved the biochemical treatment effect of coking wastewater to a certain extent, but the biological fluidized bed has the disadvantages of complex structure, difficult three-phase separation, high power consumption, etc.; the microbubbles produced by anaerobic and anoxic filters It will stay in the filter for a long time, occupy the effective reaction space of the filter for a long time, and reduce the treatment efficiency. In addition, some biofilm fillers are also prone to hardening and clogging, requiring frequent backwashing, resulting in unstable treatment effects

Method used

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  • Method for treating coking wastewater
  • Method for treating coking wastewater

Examples

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Effect test

Embodiment 1

[0030] like figure 1, During the wastewater treatment process of a coking plant, the influent COD is 800-1300mg / L, ammonia nitrogen is 60-100mg / L, and pH is 7.5-8.5. The waste water enters the hydrolysis pool after adjusting the water quantity and quality in the regulating pool. The sludge concentration in the hydrolysis pool is 5500-7000mg / L, and the inside is filled with biological rope filler. Upflow water distribution is adopted, and the hydraulic retention time is 10h. The effluent from the hydrolysis tank enters the anoxic tank from the lower part, and a mechanical stirring device is installed in the anoxic tank, the sludge concentration is 4000-5000mg / L, and the hydraulic retention time is 13h. After being treated in the anoxic tank, the wastewater flows into the pre-aeration tank, and the pre-aeration tank is filled with biological rope filler, made of polypropylene, with a diameter of 100 mm, aerated by a perforated tube at the bottom of the tank, and the concentrati...

Embodiment 2

[0033] like figure 1 , During the wastewater treatment process of a coking plant, the influent COD is 1000-2000mg / L, ammonia nitrogen is 80-220mg / L, and pH is 7.0-8.5. The waste water enters the hydrolysis pool after adjusting the water quantity and quality in the regulating pool. The sludge concentration in the hydrolysis pool is 6000-7500mg / L, and the inside is filled with biological rope filler. Type water distribution, the hydraulic retention time is 12h. The effluent from the hydrolysis tank enters the anoxic tank from the lower part. A mechanical stirring device is installed in the anoxic tank. The sludge concentration is 4000-5500mg / L, and the hydraulic retention time is 16h. After being treated in the anoxic tank, the wastewater flows into the pre-aeration tank, and the pre-aeration tank is filled with biological rope filler, made of polypropylene, with a diameter of 45mm, aerated by a perforated tube at the bottom of the tank, and the concentration of dissolved oxyge...

Embodiment 3

[0036] like figure 1 , During the wastewater treatment process of a coking plant, the influent COD is 1500-2500mg / L, ammonia nitrogen is 70-210mg / L, and pH is 7.5-9.0. The waste water enters the hydrolysis pool after adjusting the water volume and quality in the regulating pool. The sludge concentration in the hydrolysis pool is 6000-8000mg / L, and the interior is filled with biological rope fillers. The rope core is surrounded by ring-shaped thin fibers made of nylon, vinylon and polypropylene. The diameter is 50mm, and the upper flow water distribution is adopted, and the hydraulic retention time is 13h. The effluent from the hydrolysis tank enters the anoxic tank from the lower part. A mechanical stirring device is installed in the anoxic tank. The sludge concentration is 5000-6000mg / L, and the hydraulic retention time is 17.5h. After being treated in the anoxic tank, the wastewater flows into the pre-aeration tank, and the pre-aeration tank is filled with biological rope f...

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Abstract

The invention discloses a method for treating coking wastewater, which belongs to the field of wastewater treatment. The method comprises the following steps that: wastewater of a coking plant enters a regulating reservoir for the adjustment of water quality and water amount, and orderly enters a hydrolytic tank, an anaerobic tank, a preaeration tank, a preliminary sedimentation tank, an aerobic tank, a secondary sedimentation tank and a coagulation reaction tank for treatment, wherein the hydrolytic tank and the preaeration tank are filled with a bio-cord filler; the sludge of the preliminary sedimentation tank refluxes into the hydrolytic tank and the anaerobic tank respectively; a clarifying solution of the secondary sedimentation tank refluxes into the anaerobic tank; and the aerobic tank adopts a moving bed bio-film reactor. The bio-cord filler adopted in the invention has short film formation time and high biomass, does not need repeated washing, and has strong shock resistance;and the moving bed bio-film reactor can fix a large amount of nitrobacteria with long generation time, and has no the problem of blocking. The method can remove high-concentration ammonia nitrogen and organic substances in the coking wastewater, and the COD and the ammonia nitrogen of treated effluent can synchronously achieve the primary standard of the national integrated wastewater discharge standard (GB9878-1996).

Description

technical field [0001] The invention relates to a treatment method for coking wastewater, which belongs to the technical field of wastewater treatment, and more specifically relates to a method for treating coking wastewater by using an activated sludge and biofilm combined system. Background technique [0002] Coking wastewater is industrial wastewater generated during high-temperature dry distillation of coal, gas purification, product recovery, and refining of tar and crude benzene. In addition to high concentrations of inorganic pollutants such as ammonia nitrogen, cyanide, thiocyanide, and sulfide, coking wastewater also contains phenolic compounds, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds containing nitrogen, oxygen, and sulfur, and fatty acids. organic pollutants such as compounds. Ammonia nitrogen is toxic to aquatic organisms and is one of the "culprits" that cause eutrophication of water bodies; phenolic compounds are protoplasmic poison...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30C02F1/52C02F3/10
CPCY02W10/10
Inventor 任洪强时孝磊王智丁丽丽
Owner NANJING UNIV
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