Multifunctional purification tank for treating extracted benzoic acid wastewater

Abstract

The invention relates to a multifunctional purification tank for treating extracted benzoic acid wastewater. The multifunctional purification tank comprises a tank body, a water feeding pipe and a water discharging pipe, wherein the interior of the tank body is divided into an anaerobic zone, a first-stage aerobic zone, a second-stage aerobic zone, a settling zone and a disinfection zone in sequence through partition plates; the water feeding pipe is mounted on the left side wall of the tank body and is communicated with the anaerobic zone; the water discharging pipe is mounted on the right side wall of the tank body and is communicated with the disinfection zone; the disinfection zone is arranged on the settling zone at the water discharging pipe; biological filtering beds are mounted in the anaerobic zone, the first-stage aerobic zone and the second-stage aerobic zone, and adopt corrugated packing; the corrugated width of a corrugated plate in the anaerobic zone is less than the corrugated widths of the corrugated plates of the two stages of aerobic zones; aeration devices are mounted in the first-stage aerobic zone and the second-stage aerobic zone. The purification tank adopts the first-stage aerobic zone and the second-stage aerobic zone, so that the wastewater enters the anaerobic zone for acidification and hydrolysis at first, then enters the first-stage aerobic zone and the second-stage aerobic zone, and is finally discharged through the settling zone and the disinfection zone. By the adoption of the device for treating the extracted benzoic acid wastewater, the biological degrading speed can be greatly increased, and the treatment effect can be improved.

Description

Technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a multifunctional purification tank used for processing extracted benzoic acid wastewater. Background technique [0002] Benzoic acid, also known as benzoic acid, is the main raw material for the production of food preservative sodium benzoate. Benzoic acid is mainly produced under the catalysis of organic acid metal salts, and there are also some by-products such as benzaldehyde and benzyl alcohol. After the high-concentration organic wastewater produced during the production of benzoic acid is extracted with toluene, the wastewater still contains 60-100mg / L of benzoic acid and benzyl alcohol; the soluble characteristics of these organic substances will remain in the water, resulting in higher COD concentration 20000mg / L, it belongs to high-concentration organic wastewater, so it is difficult to directly treat it by biodegradation. At present, the commonly used treatment m...

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Problems solved by technology

Although the toluene extraction process greatly reduces the concentration of organic pollutants in the wastewater, the wastewater still cannot be discharged up to the standard, and subsequent biochemical treatment must be carried out

[0004] In the prior art, there is no relevant literature record about the biodegradation of benzoic acid wastewater after toluene extraction using a self-made bioreactor

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