High-phosphorus food industry wastewater treatment method and treatment system thereof

Abstract

The invention discloses a high-phosphorus food industry wastewater treatment method and a treatment system thereof.The treatment method comprises the steps that wastewater is discharged into a coagulation air floatation tank for physicochemical pretreatment, the wastewater is discharged into a hydrolysis acidification tank for biochemical phosphorus removal, total phosphorus in wastewater at a wastewater inlet end is monitored, and when the total phosphorus of the wastewater at the wastewater inlet end is larger than a preset threshold value, the wastewater at the wastewater inlet end is discharged into the coagulation air floatation tank; and carrying out advanced treatment on the wastewater by adopting a dephosphorization agent. The wastewater is treated according to the total phosphorus in the wastewater at the wastewater inlet end, and when the total phosphorus is smaller than a preset threshold value, the coagulation floatation tank is adopted as a secondary biochemical phosphorus removal system composed of primary physicochemical pretreatment and'hydrolysis acidification tank-contact oxidation tank 'for treatment, so that the effluent can reach the discharge standard, blind dosing of chemicals is avoided, and the wastewater treatment efficiency is improved. When the total phosphorus is greater than a preset threshold value, a phosphorus removal sedimentation tank is added as a three-stage chemical phosphorus removal system, a three-stage combined phosphorus removal process is adopted to ensure that the effluent quality is stable and reaches the standard, the investment is saved, the operation is stable, and the treatment efficiency is high.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment method for high-phosphorus food industrial wastewater and a treatment system thereof. Background technique [0002] Phosphorus in natural water bodies mainly comes from pesticides and fertilizers, detergents, industrial production and domestic sewage. When the content of phosphorus in water bodies is greater than 0.02 mg / L, eutrophication can be caused, thus endangering the environment and human health. In recent years, the requirements for phosphorus discharge at home and abroad have become more and more strict, and the large-scale control of phosphorus content in water bodies is generally emphasized. At present, the main methods for treating phosphorus-containing wastewater include chemical precipitation, crystallization, adsorption, oxidation, and biological methods. Among them, chemical precipitation has become the most practical and effective method...

AI Technical Summary

Problems solved by technology

Among them, the chemical precipitation method has become the most practical and effective method for wastewater phosphorus removal due to its advantages of simple operation and stable phosphorus removal efficiency, but it also brings secondary pollution and high treatment costs.

The biological phosphorus removal method is economical and environmentally friendly, but the phosphorus removal effect is unstable and the removal effect on inorganic phosphorus is poor, and it is impossible to guarantee discharge standards

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