Method for advanced oxidation treatment of wastewater through complex ferrous activated persulfate or hydrogenperoxosulfate by multicomponent blending

Abstract

The invention discloses a technology for advanced oxidization treatment of wastewater through complex ferrous activated persulfate or hydrogenperoxosulfate by multicomponent blending, and belongs to the field of water pollution control technology. According to the technology, a blending complexing agent is selected according to different water quality, and the mixing ratio of the blending complexing agent is controlled; the coordination space of active center irons is fully utilized to improve the stability of a complex compound, and thus the organic matter treatment efficiency of complex Fe2<+> catalyzed and activated sulfate or hydrogenperoxosulfate can be effectively improved. By blending, the pH (Potential of Hydrogen) range of complex Fe2<+> catalyzed and activated sulfate or hydrogenperoxosulfate is further expanded, relatively high pollutant removal rate can be kept at high pH condition, and the output of iron cements is decreased. The novel technology for the advanced oxidization treatment of the wastewater through complex ferrous activated persulfate or hydrogenperoxosulfate by multicomponent blending is high in efficiency, easy in operation, and applicable to the water treatment technology of organic wastewater with high pH (Potential of Hydrogen), and has a wide application potential in the field of advanced treatment of the wastewater.

Description

Technical field: [0001] The invention relates to a method for oxidatively treating waste water with multi-component complexation compounding as ferrous complex to catalyze and activate persulfate or monoperoxyhydrogensulfate, and belongs to the technical field of water pollution control. Background technique: [0002] In recent years, SO has been produced by activating substances such as persulfate (PS) or monoperoxyhydrosulfate (PMS) 4 ·- The method of oxidative treatment of organic pollutants has attracted more and more attention because of its better oxidative degradation potential for persistent organic pollutants than the conventional Fenton method. [0003] In the actual wastewater treatment process, Fe 2+ Activation is widely used as the most feasible method of persulfate or monoperoxybisulfate activation. However, currently Fe 2+ There are still many problems to be solved in the activation method: when the wastewater pH is near neutral or even higher, Fe 2+ The ...

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Problems solved by technology

However, although the above-mentioned complexation method can increase the Fe 2+ Catalytically activated persulfate or monoperoxyhydrogensulfate oxidatively degrades the removal efficiency of refractory organic matter, but there are still some problems as follows: (1) Complexing agent complexes Fe 2+ The ability of organic acids varies greatly, and in general, organic acids complex Fe 2+ The ability is weak, and it needs to pass through a higher complexing agent and Fe 2+ Ratio to improve the efficiency of complexing catalytic activation of persulfate or monoperoxyhydrogensulfate to oxidize and degrade refractory organic matter, increasing the dosage of complexing agent

And complexing agents such as EDTA and pyrophosphoric acid complex Fe 2+ The ability is extremely strong, and can be used in a lower complexing agent Fe 2+ Under the condition of proportioning, keep Fe 2+ solubility properties while effectively reducing Fe 2+ The reaction rate with persulfate or monoperoxyhydrogensulfate, however, is too high for complexation stability, so that Fe 2+ The reactivity of the active center site is severely inhibited, and the complexing catalytic performance is very low. At the same time, EDTA and pyrophosphate are strong complexing agents and nutrient salts, respectively, which also have certain environmental risks.

(2) Fe 2+ On the one hand, single-ligand complexes complex Fe 2+ Weak ability, prone to dissociation and complexation of Fe 2+ The catalytic activation performance is reduced. On the other hand, the above-mentioned weak acid complexing agents containing carboxylic acids are more likely to react with sulfate radicals to degrade than refractory organics, thus losing the ability of complexing catalytic activation of persulfate or monoperoxyhydrogensulfate. capacity, while also reducing the utilization efficiency of sulfate radicals

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