System and method for deeply treating chemical wastewater and biochemical tail water

Abstract

The invention discloses a system and a method for deeply treating chemical wastewater and biochemical tail water, belonging to the technical field of wastewater treatment. The system comprises a physicochemical treatment system and a biochemical treatment system, wherein a distribution reservoir, a coagulating reaction tank, a sedimentation tank, an ozone oxidation reactor and a buffering tank in the physicochemical treatment system are connected in sequence; and the biochemical treatment system comprises a biological activated carbon filter, a drain tank and a sludge thickening tank. In the method, the pH value of the wastewater is regulated, and then, effluent is obtained after being sequentially subjected to coagulation, sedimentation, ozone oxidation and biological filter treatment, wherein part of sludge can be used as a catalyst to be recycled. Potassium permanganate and aluminum salt are used as a pre-oxidant and a coagulant, and manganese dioxide generated through reaction is used as an oxidant, an adsorbent, a catalyst and a reaction crystal nucleus, so that organic matters are further degraded, and the sludge settleability is improved. The effluent obtained through treating the wastewater by using the method disclosed by the invention can completely conform to the grade-A discharge standard of a wastewater treatment plant.

Description

Technical field [0001] The invention involves the field of wastewater treatment technology, and more specifically, it involves a system and method of deep treatment of biochemical tailwater in chemical wastewater. Background technique [0002] With the increasingly serious pollution situation, the requirements of environmental protection are getting higher and higher, and the depth treatment of biochemical tailwater has become one of the key factors restricting the sustainable development of my country's environmental protection.According to statistics, about 70 % of the sewage plants in more than 300 chemical parks in my country are difficult to stabilize the standards, and the depth governance situation of chemical wastewater is still severe. [0003] Biochemical tail water often contains difficulty degradable solubility organic pollutants. The conventional treatment process, such as concrete precipitation, is difficult to ensure stable water out of standards.For the characteri...

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Problems solved by technology

Potassium permanganate pre-oxidation technology is widely used in the treatment of low-concentration and low-turbidity water source sewage, such as Chinese Patent No. ZL200410013515.1, the authorized announcement date was June 28, 2006, and the name of the invention is: Ozone and high The oxidative coagulation aiding method of combined treatment with potassium manganate, the application uses potassium permanganate or a mixture of potassium permanganate and other agents to treat drinking water sources before or after ozone, which has achieved better treatment effects and improved However, when this method is applied to the advanced treatment of chemical wastewater, on the one hand, the effluent is difficult to meet the first-class A standard, and on the other hand, potassium permanganate or a mixture of potassium permanganate and other chemicals are used Oxidation is carried out in the same process, the ratio of the sediment after the coagulation reaction to the ozone oxidation reaction is not easy to control, too much or too little sediment remaining in the ozone reaction system will affect the treatment effect

Application No. 201310690136.5, Invention Name: A chemical conversion and granulation coagulation method for refractory organic matter. In this application, potassium permanganate is first added to wastewater, followed by ozone, and finally coagulation and precipitation. The granulation and coagulation of organic pollutants has achieved certain results, but this method is not conducive to continuous operation and is difficult for large-scale engineering applications. Exceeding the standard

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