Catalytic flue gas desulfurization wastewater exceeds standards

With PTU unit? What is the furnace temperature of the waste heat boiler in front? Nitrogen content of raw materials?

Is the purified water from sewage stripping used as the washing water source?

Is it Berg's craftsmanship? If it is Berg's or Berg's process package, the oxidation tank is designed for SO32- in the drainage liquid. If there are other oxygen-consuming substances in the water, the oxidation tank is powerless. The PTU drainage COD index in the Berg process package is less than 60 mg/l, which specifically refers to the COD generated by sulfites. So is it the result of COD concentration in fresh water? As for the excessive nitrogen oxides, we can analyze it through the changes in raw materials and the supply of ozone!

What are the indicators you control? And tell me what process you use for processing. Let you analyze it for you. Because various manufacturers of flue gas desulfurization now use different ones, and others may not be consistent with yours.

It is similar to the process designed by Jinan Coal Design Institute. The 180°C flue gas discharged from the waste heat boiler enters the flue gas desulfurization quenching tower through the flue gas booster fan, and is sprayed and cooled through two layers of fresh water nozzles. The flue gas whose temperature drops to 70°C enters the desulfurization tower to add alkali liquid and fresh water for desulfurization. The sewage discharged from the bottom of the desulfurization tower and the quench tower enters the sedimentation tank to settle, then enters the oxidation tank for oxidation and is finally discharged. Now the COD of sewage has reached more than 5,000, and the sulfate content is more than 15,000. The sewage treatment plant is not allowed to discharge. I can't figure out what sulfide is contained in the water. How can the flue gas desulfurization sewage contain sulfide? Then there is the question of how to solve the problem of high COD indicators. If the wind in the oxidation tank is turned on appropriately, the effect will not change much. Is the design of the oxidation tank and oxidation air pipeline unreasonable?

First, confirm the flue gas temperature of the waste heat boiler. Test the nitrogen content in flue gas. The sulfide should be discharged with the desulfurization water due to insufficient oxidation. Further settling is required. Water with a COD of 5,000 and ammonia nitrogen of more than 10,000 can be treated, and the gas can be removed in one step. If you need anything, please contact me directly QQ52365354

There is a problem with the analysis method of sulfide, and the error caused by sulfite needs to be eliminated. The brine containing flue gas desulfurization does not contain sulfides. High COD is not necessarily caused by sulfites, but may also be related to insufficient combustion.