Automatic treatment system and method for denitrification and dephosphorization of wastewater

Abstract

The invention discloses an automatic treatment system and an automatic treatment method for removing nitrogen and phosphorus from wastewater. The automatic treatment system comprises a sewage treatment system and an automatic control system, wherein the automatic control system comprises a monitoring device and a remote control device; the sewage treatment system comprises an anaerobic tank, a facultative tank and an aerobic sludge tank, wherein a water distribution guide wall is arranged between the facultative tank and the aerobic sludge tank, the anaerobic tank is internally provided with a submersible stirrer, the facultative tank is internally provided with an inverted-umbrella-shaped surface aerator, the aerobic sludge tank is internally provided with a low-speed mixing flow booster, a water decanter, a submersible nitrification return pump and a sludge-discharge submersible pump and meanwhile, the aerobic sludge tank is externally connected with a frequency conversion fan and a liquid caustic soda adding pump. By introducing the automatic treatment system, the labor intensity is decreased, the wastewater treatment work is smarter and the overall operating cost is reduced. In addition, by adopting the automatic treatment method, namely, intermittent service of the anaerobic tank and the facultative tank according to the drainage requirement of the aerobic sludge tank, the purposes of individual and flexible running and in-series running are achieved and the phosphorus and nitrogen removal effect is greatly improved.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to an automatic treatment system and method for removing nitrogen and phosphorus from medium and low concentration COD and ammonia nitrogen wastewater in the fields of food, printing and dyeing, electroplating, slaughtering and the like. Background technique [0002] In the medium and low concentration COD and ammonia nitrogen wastewater in the fields of food, printing and dyeing, electroplating, slaughtering, etc., the COD content is 700 mg / L, the ammonia nitrogen content is 100 mg / L, the total phosphorus content is 5 mg / L, and the total nitrogen content is 120 mg / L. L. At present, there are many denitrification processes for medium and low concentration ammonia nitrogen wastewater, mainly including pretreatment + A / O system, pretreatment + CASS system, pretreatment + SBR system, complete mixed anaerobic reaction system, biological contact oxidation, Sub-sodium oxidation method...

AI Technical Summary

Problems solved by technology

At present, there are many denitrification processes for medium and low concentration ammonia nitrogen wastewater, mainly including pretreatment + A / O system, pretreatment + CASS system, pretreatment + SBR system, complete mixed anaerobic reaction system, biological contact oxidation, Sub-sodium oxidation method, etc. These traditional processes have their own shortcomings, such as incomplete phosphorus removal, poor removal effect of total nitrogen up to ammonia nitrogen standard, poor controllability, high operating cost, unstable system parameters, large floor area, etc.

At the same time, these traditional processes still need to be established under human control, and there is no complete automation system, which has caused operational problems such as excessive energy consumption and increased personnel costs.

Images