Device and method for improving biological dephosphorizing and denitriding efficiency of low carbon source sewage

Abstract

The invention provides a device and a method for improving the biological dephosphorizing and denitriding efficiency of low carbon source sewage, belonging to the technical fields of sewage treatment and residual sludge treatment. The method comprises the following steps of: under the microwave alkaline hydrolysis condition, hydrolyzing solid organic matters in the residual sludge into soluble organic matters; recovering and hydrolyzing nitrogen and phosphor in supernate by adopting a magnesium ammonium phosphate setting method; and adding the hydrolyzed supernate subjected to dephosphorizing and denitriding treatment in the low carbon source sewage and carrying out biological dephosphorizing and denitriding treatment on the hydrolyzed supernate so as to improve the biological dephosphorizing and denitriding efficiency of the low carbon source sewage. According to the invention, by carrying out the microwave alkaline hydrolysis treatment on the residual sludge to produce high-concentration soluble organic matters easy to biodegrade, the product can be used as a low-price carbon source subjected to biological dephosphorizing and denitriding treatment in the lower carbon source sewage, and the biological dephosphorizing and denitriding efficiency in the lower carbon source sewage can be improved; meanwhile, sludge minimization, reclamation and harmlessness can be realized. The VSS (Volatile Suspended Solids) solubility in the sludge can be improved to 82 percent, so that the effluent quality of the low carbon source sewage treated by the device and the method achieves the first-class B standard 'Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant' (GB18918-2002).

Description

Technical field

[0001] The invention belongs to a sewage and surplus sludge treatment method, in particular to a device and a treatment method for improving the biological phosphorus and nitrogen removal efficiency of low-carbon source sewage. Background technique

[0002] With the increasing eutrophication of the water environment, my country has increasingly strict requirements on the concentration of total nitrogen (TN) and total phosphorus (TP) in the effluent from urban sewage treatment plants. In the biological treatment process of urban sewage, biological nitrogen and phosphorus removal processes require a large amount of carbon sources.

[0003] For most sewage treatment plants, the carbon source in the influent water is the limiting factor for biological phosphorus and nitrogen removal. For example, after the completion of many urban sewage treatment plants in my country, the COD concentration in influent water is generally low, while the content of TN and TP is relativel...

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