Method for treating wastewater with high COD (Chemical Oxygen Demand), high ammonia nitrogen and high salt content
A wastewater treatment and high ammonia nitrogen technology, which is applied in the field of high COD, high ammonia nitrogen, and high salt wastewater treatment, can solve the problems of unstable treatment effect, excessive ammonia nitrogen index in sewage stations, and high disposal costs, so as to alleviate the pressure of sewage disposal and improve operation The effect of process optimization and low salt index
Pending Publication Date: 2022-05-24
山东东顺环保科技有限公司
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Problems solved by technology
[0003] The following problems exist in the prior art treatment process: 1) the COD removal rate of wastewater with high COD, high ammonia nitrogen, and high salt content is about 40% after Fenton oxidation, and the COD is still very high; 2) the treatment effect is unstable and waste A large amount of chemicals; 3) The ammonia nitrogen removal rate of the treated supernatant is very low. Disposal will lead to an increase in the salt content of the sewage station, which is not conducive to the normal survival of the sludge, and may lead to the paralysis of the biochemical system of the sewage station; 5) The follow-up wastewater treatment process is complicated, the disposal difficulty is increased, and the disposal cost is high
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Embodiment 1
[0035] The high COD, high ammonia nitrogen, high salt-containing wastewater treatment system adopted in this embodiment is as follows: figure 1 As shown, it includes a raw water collection tank 1, an integrated Fenton oxidation tower 2, a primary pH adjustment device, a plate and frame filter press 13, a three-phase catalytic oxidation tower 14, an evaporation device, a secondary pH adjustment device, and an ammonia nitrogen stripping tower. 19 and the ammonia nitrogen absorption tower 20; the above devices are communicated through the outlet pipe. The water inlet pipe of the integrated Fenton oxidation tower 2 is connected to the raw water collecting tank 1 where the sewage is placed; the integrated Fenton oxidation tower 2 includes a ferrous sulfate dosing device 3, a PAC dosing device 4, a PAM dosing device 3 for adding drugs to it. Dosing device 5, sulfuric acid dosing device 6, defoamer dosing device 7, hydrogen peroxide dosing device 8, water inlet device, sludge tank 10...
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Abstract
The invention discloses a method for treating wastewater with high COD (Chemical Oxygen Demand), high ammonia nitrogen and high salt content. The method comprises the following steps: regulating the pH value of the wastewater to 3-4, carrying out Fenton oxidation, regulating the pH value to 5-6, carrying out filter pressing, carrying out catalytic oxidation on filtrate, evaporating to remove salt, regulating the pH value of distillate to 9-10, and stripping to separate out ammonia to obtain treated wastewater. When the wastewater treatment method disclosed by the invention is used for treating wastewater with high COD (Chemical Oxygen Demand), high ammonia nitrogen and high salt content, the treatment cost is reduced to 1400 yuan / ton from the original 2400 yuan / ton; the wastewater treatment method has the advantages that the process operation flow is optimized, the operation is simplified, the generated ammonia water can be effectively utilized when the ammonia nitrogen is removed, the indexes of COD, ammonia nitrogen and salt content of the treated wastewater are low, the subsequent sewage treatment difficulty is reduced, and the sewage treatment pressure is relieved.
Description
technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for treating wastewater with high COD, high ammonia nitrogen and high salt content. Background technique [0002] With the development of the organic chemical industry and the improvement of the refining rate, the amount of waste liquids with high chemical oxygen demand (COD), high ammonia nitrogen, and high salt content is increasing. Such waste liquids generally contain very low calorific value. If the incineration method is used for disposal, not only the disposal cost is high, but also energy waste will be caused. At present, the commonly used treatment method in China is generally to use Fenton's reagent for oxidation treatment to reduce the COD of waste liquid. See the treatment process flow. figure 1 , specifically: 1) First add lye to the waste liquid, adjust the pH value of the waste liquid to about 8.0-9.0, if precipitate occurs, add PAC (polyaluminum...
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IPC IPC(8): C02F9/10C02F101/16
CPCC02F9/00C02F1/66C02F1/722C02F1/725C02F1/04C02F1/5245C02F1/56C02F2101/16Y02W10/10
Inventor 苏立伟禚权谊沈彦志董超谭健张莹莹
Owner 山东东顺环保科技有限公司