A3O industrial wastewater biochemical treatment technology and apparatus thereof

Abstract

The invention discloses an A3O industrial wastewater biochemical treatment technology and an apparatus thereof. The A3O industrial wastewater biochemical treatment technology comprises the following steps: 1, injecting sewage having a pH value of 8-9 to a hydrolysis acidifying reaction tank, and allowing the sewage to sequentially flow through an anoxic denitrification reaction tank, an anoxic dephosphorization reaction tank and an activated sludge reaction tank; 2, returning sludge in the anoxic dephosphorization reaction tank to the hydrolysis acidifying reaction tank; 3, returning sludge in the activated sludge reaction tank to the anoxic denitrification reaction tank; and 4, returning sludge in the activated sludge reaction tank to the anoxic dephosphorization reaction tank, and discharging the sludge. The reflux ratio of the sludge is adjusted on the premise that the hydraulic retention time is not increased, the volumes of the above tanks are not enlarged and the engineering cost is not increased in order to reach COD reduction, denitrification and dephosphorization efficacies of a biochemical system, and make the ammonia nitrogen and total phosphorus in outlet water reach the first level standards of Integrated Wastewater Discharge Standard (GB8978-1996).

Description

technical field [0001] The present invention relates to the field of industrial wastewater treatment, in particular to A 3 O industrial wastewater biochemical treatment process and its equipment. Background technique [0002] Traditional A 2 O biochemical treatment process, that is, anaerobic-anoxic-oxic method (Anaerobic-Anoxic-Oxic), can be divided into two parts: one is phosphorus removal, phosphorus in sewage is released in anaerobic state, and phosphorus-accumulating bacteria are released. Under aerobic conditions, it is absorbed more and discharged from the system in the form of residual sludge. The second is denitrification. Due to the action of facultative oxygen denitrification bacteria, BOD in water is used as a hydrogen supplier (organic carbon source) to reduce the nitrate and nitrite from the mixed solution of the aerobic tank into nitrogen and escape into the atmosphere to achieve purpose of denitrification. [0003] At present, after most industrial wastew...

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Problems solved by technology

[0004] At present, the country's control over nitrogen and phosphorus in wastewater discharge is becoming more and more strict, and the requirements for treatment technology are getting higher and higher. This has virtually increased the cost of sewage treatment for enterprises and caused a burden on enterprises.

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