What are the technical advantages of microwave wastewater treatment equipment

1. A high COD wastewater treatment method, characterized in that it includes the following steps: Step 1: add calcium salt to the wastewater, calcium ions react with the carbonate in the wastewater to generate calcium carbonate, and then precipitate to remove the calcium carbonate, the amount of calcium salt added should be so that the calcium salt will be completely removed from the carbonate in the wastewater; Step 2: under stirring to the wastewater after the treatment in Step 1 to add sulfamate in batches, sulfamate to reduce the nitrite in the wastewater to generate N2, when no more bubbles in the wastewater is completed the removal of nitrite; sulfamate to add the total amount should be completed when no more bubbles are generated; sulfamate to remove the nitrite. N2 in the wastewater nitrite reduction, when the wastewater no longer produces bubbles that is the completion of the removal of nitrite; the total amount of sulfamic acid should be added so that the sulfamic acid will be completely removed from the wastewater nitrite; Step 3: The pH value of the wastewater treated in Step 2 is adjusted to 10-12; Step 4: The wastewater after the adjustment of the pH is sent to the reactor for microwave catalytic oxidation, and the reactor is added with microwave catalysts, and a microwave catalyst is added to the reactor. Add microwave catalyst, to the wastewater in the reactor to apply power between 100W ~ 1000W microwave, said microwave catalyst from the activated carbon surface loaded transition metal manganese oxides, and the specific surface area of the microwave catalyst at least 800 ~ 1200m2 / g, microwave oxidation treatment time lasts for 3-4h; Step 5: Repeat step 4 a number of times to COD of the microwave-treated wastewater falls below the discharge standard. 2. A high COD wastewater treatment method according to claim 1, characterized in that the process of adding calcium salt to the wastewater in step 1 should be accompanied by stirring of the wastewater, so that the wastewater reacts fully with the calcium salt. A high COD wastewater treatment method according to claim 1, characterized in that a microwave catalyst is put into the reactor in step 4, and the dosage of said microwave catalyst is 35-45g/L by volume of the high COD organic wastewater. A high COD wastewater treatment device characterized in that it is provided with a sedimentation filtration tank, an acid and alkali adjusting tank, and a microwave catalytic oxidation reactor, wherein a sedimentation filtration tank is provided with a charging pipe and a filtering pipe, and a microwave catalytic oxidation reactor is provided with an acid and alkali adjusting tank. The pool is provided with a charging pipe and a filter module, and the microwave catalytic oxidation reactor is provided with an exhaust pipe and a catalyst addition port in the upper part of the shell, and a drainage port in the lower part of the shell. 5. A high COD wastewater treatment device according to claim 4, characterized in that the precipitation filtration tank is provided with a multi-stage filtration module sequentially disposed along the wastewater flow direction, and said filtration module is a filtration grid fixed with an adsorbent. DESCRIPTION OF THE HIGH COD WASTEWATER TREATMENT METHOD AND DEVICE TECHNICAL FIELD: The present invention relates to the field of wastewater treatment technology, specifically a high COD wastewater treatment method and a device with a reasonable process and high treatment efficiency. BACKGROUND TECHNOLOGY: Wastewater with high nitrite, high carbonate and high COD concentration usually comes from the chemical production industry, with COD concentration >5000mg/L, nitrate concentration >1000mg/L, carbonate concentration >1000mg/L, BOD5/COD <0.1, the toxicity of this type of wastewater is high, the biochemistry is poor, and organic pollutants in it are This kind of wastewater has high toxicity and poor biochemistry, in which there are many kinds of organic pollutants, mainly benzene, organic nitrile and heterocyclic, and so on. At present, three-effect evaporation and high-temperature incineration methods are mainly used to deal with this kind of wastewater, but these methods have the following shortcomings: (1) the energy consumption of evaporation and incineration is too high, and the treatment cost is very high; (2) the organic pollutants in the wastewater can not be completely degraded, and it is easy to cause the secondary pollutants; (3) a large number of nitrite hazardous solid wastes will be produced in the process of treatment, and nitrites are strongly carcinogenic, and the contact with organic substances is easy to explode, and the secondary waste will be easily destroyed. Organic contact is prone to explosion, secondary pollution is more serious.