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

A technology for simultaneous denitrification and dephosphorization and urban sewage removal is applied in the field of electrochemical synchronous denitrification and dephosphorization devices, which can solve the problems of complicated equipment structure of wastewater treatment system, unsatisfactory sewage index removal rate, affecting the efficiency of electro-oxidation treatment, etc. To achieve the effect of being beneficial to denitrification and phosphorus removal, saving manpower and improving oxidation effect

Inactive Publication Date: 2015-05-20
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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Effect test

Embodiment 1

[0036] Example 1 A device for electrochemical simultaneous denitrification and dephosphorization of urban sewage

[0037] The device such as figure 2 As shown, the electrolytic cell 1 is provided with a conical bottom 2, which is convenient for flocculation and oxidation precipitation collection; the bottom of the conical bottom 2 is welded to the three-way valve 3, and the three-way valve 3 is respectively connected to the sewage pipe 4 and the water outlet pipe 5. ;

[0038] The side wall of the electrolytic cell 1 above the conical bottom 2 is provided with a water inlet, and the water inlet is fixedly welded with the water inlet pipe 6, and a flow meter 7 is arranged on the water inlet pipe 6, and the flow meter 7 passes through the outlet of the sewage pump 8 The water inlet pipe 6 is movably connected, and the inlet of the sewage pump 8 is movably connected with the water outlet valve 21 of the sewage tank 9 through a water pipe;

[0039] One side of the conical botto...

Embodiment 2

[0045] Open the outlet valve of the sewage tank, start the sewage pump, pump the sewage to be treated into the electrolytic cell, the sewage volume is 75% of the total capacity of the electrolytic cell, close the sewage pump and the sewage tank outlet valve after entering the water; turn on the DC power supply, adjust the current density 25mA / cm 2 , carry out electrochemical treatment for 15 minutes, at this time, reverse the electrode treatment for 5 minutes, pass compressed air into the aeration device during the whole process, and the aeration volume is 1.0L air / min.L sewage; then turn off the DC power supply and compressed air, and turn off the electrolytic cell Open the conical bottom three-way valve to the sewage pipe to collect nitrogen and phosphorus sediments; then open the conical bottom three-way valve of the electrolytic cell to the outlet pipe to collect the treated sewage for further solid-liquid separation, and the treated water can be discharged up to the standa...

Embodiment 3

[0052] Open the outlet valve of the sewage tank, start the sewage pump, pump the sewage to be treated into the electrolytic cell, the sewage volume is 75% of the total capacity of the electrolytic cell, close the sewage pump and the sewage tank outlet valve after entering the water; turn on the DC power supply, adjust the current density 15mA / cm 2 , carry out electrochemical treatment for 10 minutes, and supply compressed air to the aeration device during the whole process. Sewage pipes to collect nitrogen and phosphorus sediments; then open the three-way valve at the conical bottom of the electrolytic cell to the outlet pipe to collect the treated sewage for further solid-liquid separation, and the treated water can be discharged up to the standard.

[0053] Treated by the above method, the treated water pollution indicators are shown in Table 3

[0054] table 3

[0055]

[0056] Note: The degree of electrode passivation from light to heavy is: slight, normal, relatively...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/463C02F1/467
Inventor 赵旭曲久辉刘会娟兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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