Electrochemical synchronous nitrogen and phosphorus removal apparatus and municipal sewage treatment method

Abstract

The invention discloses an electrochemical synchronous nitrogen and phosphorus removal apparatus and a municipal sewage treatment method, and belongs to the technical field of sewage treatment. A dimensionally stable electrode, an iron electrode, an aluminum electrode, a magnesium electrode and a copper modified stainless steel electrode which are commonly used in an electrochemical water treatment technology are combined to realize the nitrogen and phosphorus removal treatment of the municipal sewage in a same electrolytic cell. The apparatus has the advantages of simple structure, operation convenience, high efficiency, stable indexes of discharged water, and realization of the large-scale automatic sewage treatment. The municipal sewage method has the advantages of simple technology, operation convenience, manpower and material resource saving, low energy consumption, high removal rate of sewage pollution indexes, and realization of the removal rate of each of the municipal sewage indexes comprising the chemical oxygen demand, nitrate nitrogen, ammonia nitrogen and total phosphorus to reach above 92%.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to an electrochemical synchronous denitrification and phosphorus removal device and an urban sewage treatment method. Background technique [0002] At present, the traditional sewage treatment process can effectively treat organic matter in sewage, but the treatment effect on nitrogen, phosphorus and other nutrients is poor. A large amount of nitrogen and phosphorus are discharged, resulting in eutrophication of water bodies. At present, the nitrogen and phosphorus removal technologies for sewage are mainly biological methods and chemical precipitation methods, but these technologies also have some shortcomings in the actual operation process, such as a large amount of sludge that is difficult to dispose of, and the stability of the biological treatment process is relatively low. Poor, the conventional denitrification process needs to add carbon sources, and the operation ...

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Problems solved by technology

[0004] There are many studies on chemical denitrification or phosphorus removal alone, but there are few studies on the combination of electrochemical denitrification and electrocoagulation dephosphorization technology for sewage denitrification and phosphorus removal.

Ikematsu et al. conducted a study on the use of PtIr / Fe / PtIr electrodes to simultaneously denitrify and dephosphorize urine from source separation. The iron electrode was used as the anode in the electrochemical oxidation denitrification, and the iron electrode was switched to electrocoagulation for dephosphorization. For the cathode, it is necessary to frequently replace the positive and negative electrodes of the electrode, the operation is troublesome, and the current efficiency is low; Feng et al. combined the iron electrode electroflocculation process using a DC power supply and the Ti / RuO2 electrode electrochemical oxidation process using a pulse power supply. The process treats sewage, and it is found that the removal rate of total nitrogen, total phosphorus, ammonia nitrogen and COD in domestic sewage is almost 90%.

Chinese patent CN103130308B discloses an electrochemical wastewater treatment system and its application method for wastewater treatment. It mainly uses electrocoagulation technology to treat wastewater. The equipment structure of the wastewater treatment system is complex, inconvenient to operate, and high in operating costs.

Chinese patent CN102010091B discloses a sewage advanced treatment method. The sewage is passed through an electrolytic cell composed of three sections of different electrodes, and a three-stage selective sewage treatment process is formed by adjusting the current density and residence time. Through the advanced treatment of urban sewage, the sewage The removal rates of index chemical oxygen demand, nitrate nitrogen, ammonia nitrogen and total phosphorus reached 79.96%, 92.41%, 83.93% and 95.83% respectively, but the process is complicated, the operation is inconvenient, and the removal rate of sewage index is not very ideal

The above process separates electrocoagulation and electro-oxidation water treatment technology, and the flocs produced in the electro-coagulation process need to be precipitated in time, otherwise it will affect the treatment efficiency of electro-oxidation; at the same time, the overall process is long and the current efficiency is low

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