Method and device for improving COD detection precision of high-chlorine wastewater

Abstract

The invention discloses a method and a device for improving the COD detection precision of high-chlorine wastewater. Self-vacuumizing, a sand core plate and an electronic valve control technology areintroduced into COD detection, specially for improving the COD detection precision of high-chlorine wastewater in a laboratory. The method and the device have the advantages that the method is convenient to realize, simple in principle, high in practicability degree and high in chlorine absorption efficiency, so that the COD detection precision of high-chlorine wastewater is effectively improved,the accuracy of data is greatly ensured, and the detection level is improved.

Description

technical field [0001] The invention relates to a COD detection method, in particular to a method and a device for improving the COD detection accuracy of high-chlorine wastewater, belonging to the field of COD detection methods. Background technique [0002] Xinjiang oilfield combined treatment station uses strong acidic cation exchange resin to adsorb Ca 2+ , Mg 2+ Wait for divalent cations to achieve the purpose of reducing hardness. When the resin reaches a state of adsorption saturation and loses its adsorption capacity, regenerate the resin for recycling. Resin regeneration is to use 10% saturated NaCl solution to wash the adsorbed Ca on the resin. 2+ , Mg 2+ and other divalent cations, resin regeneration produces a large amount of high-salt organic wastewater, and high-salt organic wastewater is produced by ion exchange; it is characterized by less oil, high salinity, and many refractory substances, and there are a lot of petroleum, volatile phenol, COD and other o...

AI Technical Summary

Problems solved by technology

[0008] ①Air tightness: During the whole testing process, the testing device has poor air tightness, there is a phenomenon of air leakage, and the path of the transmission gas pipeline is long; this phenomenon will lead to an imbalance between the amount of chlorine gas produced by oxidation and the amount of chlorine gas absorbed by the absorbing liquid, resulting in the detection data High;

[0009] ② Insufficient absorption: if figure 2 As shown, the absorption process of chlorine gas is a gas-liquid contact reaction, and the structure of the absorption bottle directly affects the absorption efficiency. In the traditional absorption method, the gas guide glass tube is inserted into the conical flask liquid too shallow, and the residence time of the body in the liquid is short, resulting in chlorine gas Low absorption efficiency

The key is the height of the absorption liquid and the size of the bubbles; if the size of the bubbles is too large, the contact surface between the gas and the liquid will be greatly reduced, the height of the absorption liquid will be low, and some chlorine gas will leave the absorption liquid with the nitrogen before the complete reaction; ③ nitrogen flow rate: the flow rate is too high If the concentration is large, the contact time between the chlorine gas and the solution will be shortened correspondingly, resulting in incomplete absorption.

[0010] If the above problems occur in the absorption operation, it will affect the measurement results of chlorine gas correction COD (chloride ion correction value), resulting in high COD results, which cannot clearly guide on-site production and engineering technical requirements, and cannot accurately evaluate environmental pollution. The core of the COD detection accuracy of chlorine wastewater is to eliminate interference as much as possible, and improve the detection accuracy of high chlorine wastewater COD from the accurate determination of chlorine gas absorption results, and make a practical exploration for the improvement of high chlorine wastewater COD detection accuracy, making the data Reliable and accurate, increase social and economic benefits, and make important contributions to environmental protection

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