Method for simultaneous removal of nitrogen and phosphorus

A technology for simultaneous denitrification and dephosphorization and wastewater treatment, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of difficult simultaneous removal of phosphate and new pollution, avoid secondary pollution and reduce pharmaceutical costs Effect

Active Publication Date: 2018-06-19
JINGDEZHEN CERAMIC UNIV
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  • Abstract
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Problems solved by technology

[0008] Aiming at the technical problems that it is difficult to simultaneously remove nitrate nitrogen, ammonia nitrogen and phosphate in the sewage treatment process and the treatment based on microbial nitrification and denitrification mechanism is easy to produce new pollution, the present invention provides a method for synchronous nitrogen and phosphorus removal

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  • Method for simultaneous removal of nitrogen and phosphorus

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Embodiment 1

[0044] A kind of magnesium ammonium phosphate-electrooxidation integrated device of this embodiment, such as figure 1 As shown, it includes magnesium ammonium phosphate electro-oxidation crystallization system and nitrogen electro-oxidation system, ammonium magnesium phosphate electro-oxidation crystallization system includes reactive base and anode B6; nitrogen electro-oxidation system includes reactive base and anode A5; reactive base includes electrochemical instrument 1, Switch 3, reference electrode 4, iron filings 7, cathode 8 and reactor 9, wherein: reference electrode 4 and cathode 8 are connected in parallel through wires, and are respectively connected to electrochemical instrument 1 and suspended in the reactor 9 in a vertical state , the iron filings 7 can be suspended in the reactor 9 by magnetic stirring; the switch 3 and the electrochemical instrument 1 can be switched and connected to the anode A5 and the anode B6 respectively after being connected by wires. Th...

Embodiment 2

[0059] An integrated magnesium ammonium phosphate-electrooxidation integrated device in this embodiment has a basic structure as in Embodiment 1, except that the material of the anode A5 is SnO 2 electrode. The anode A5 and the anode B6 are arranged in parallel back and forth in the reactor 9 . The material of cathode 8 is iron plate. The reference electrode 4 is a silver chloride electrode. Used in the treatment of urban sewage.

[0060] The experimental results show that when the anode material is SnO 2 When the electrode is used, the removal rate of phosphate in urban sewage is 90.3%, but SnO 2 The electrode is beneficial to the accumulation of HO·, and the removal efficiency of nitrate nitrogen is slightly higher than that of the DSA electrode, reaching 95%, but the removal efficiency of ammonia nitrogen is reduced to 91%.

Embodiment 3

[0062] An integrated magnesium ammonium phosphate-electro-oxidation integrated device in this embodiment has the same basic structure as in Embodiment 2, except that it also includes a pH-temperature double display 2 vertically inserted and suspended in the reactor 9 . Anode A5 material is IrO 2 electrode. Anode A5 and anode B6 are arranged side by side in parallel in reactor 9 . Reactor 9 is circular in shape. Used in the treatment of landfill seepage.

[0063] The experimental results show that the circular reactor is conducive to the fluidization of iron filings, and at the same time, there is no dead angle, which is conducive to the growth of magnesium ammonium phosphate crystals, while the large particles of magnesium ammonium phosphate crystals have a faster sedimentation rate and high phosphorus removal efficiency. When the electrooxidized anode is IrO 2 electrode, IrO 2 The electrode has the characteristics of selective oxidation, in Cl - Under the condition of ...

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Abstract

Belonging to the wastewater treatment field, the invention discloses a method for simultaneous removal of nitrogen and phosphorus. The method for simultaneous removal of nitrogen and phosphorus includes the steps of: A. injecting wastewater containing nitrogen and phosphorus into a reactor; B. connecting a reference electrode, an electrochemical instrument and a cathode well; C. switching a change-over switch to an anode B, regulating the current and voltage of the electrochemical instrument, and using a magnesium alloy electrode as the anode B material; D. starting magnetic stirring to let scrap iron in a fluidized suspension state; E. adjusting the pH to weak alkalinity; F. turning on the power, and carrying out electrolytic reaction to remove phosphate and part of ammonia nitrogen in wastewater to obtain the product magnesium ammonium phosphate crystal; G. switching the change-over switch to an anode A, and maintaining other lines and the electrochemical instrument at an on-state; H. converting redundant ammonia nitrogen and nitrate nitrogen to nitrogen under the action of electrooxidation; and I. at the end of the reaction, turning off the power, discharging the supernatant, and then recovering the precipitate. The method provided by the invention can achieve simultaneous removal of nitrogen and phosphorus through simple switching of electrodes.

Description

[0001] The application of the present invention is a divisional application, the application number of the parent application: 2016102235937; the name of the parent application: a magnesium ammonium phosphate-electrooxidation integrated device and its simultaneous denitrification and phosphorus removal method; the application date of the parent application: 2016-4-12 . technical field [0002] The invention relates to the technical field of waste water treatment, in particular to a method for synchronous denitrification and phosphorus removal for the treatment of urban sewage, garbage seepage liquid and waste water from chemical fertilizer plants. Background technique [0003] With the vigorous development of my country's sewage treatment industry, the country's requirements for sewage discharge are becoming more and more stringent. However, the problem of eutrophication caused by nitrogen and phosphorus pollution has not only not been solved, but has become increasingly seri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/72C01B25/45C02F101/16C02F101/10
CPCC01B25/451C02F1/4672C02F2101/105C02F2101/16C02F2101/163
Inventor 余荣台马湘谢志鹏汪长安
Owner JINGDEZHEN CERAMIC UNIV
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