Device for pretreating pyridine wastewater by using composite nano zero-valent iron material and treatment method thereof

Abstract

The invention discloses a device for pretreating pyridine wastewater by using a composite nano zero-valent iron material and a treatment method thereof. The wastewater device comprises a nano zero-valent iron synthesis tank, a solid-liquid separation tank, a wastewater reaction tank, a Fenton pond and a sedimentation pond which are communicated in sequence; the wastewater reaction tank comprises an inclined tube settling zone, a mixed reaction zone, a dense reaction zone and a porous supporting layer which are arranged in sequence; the Fenton tank comprises an acid adjusting area, a Fenton reaction area and an alkali adjusting area which are communicated in sequence. According to the device, the nano zero-valent iron can be rapidly and conveniently manufactured on site, drying, transporting and oxidizing of the nano zero-valent iron are avoided, wet adding of the nano zero-valent iron is achieved, air contact is isolated to a certain degree, the effectiveness of the nano zero-valent iron is guaranteed, the oxidation-reduction performance is better, the oxidation degree is lower, and the utilization rate is higher; the whole system is simple in structure, convenient to operate and maintain, low in cost and more flexible compared with a conventional advanced oxidation technology.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a device for pretreating pyridine wastewater with a composite nanometer zero-valent iron material and a treatment method thereof. Background technique [0002] Pyridine-based derivative pesticide products mainly include chemical products such as clopyralid, tetraclopyralid, pentachloropyridine and 2,3,5,6-tetrachloropyridinethiol. The production process of pyridine pesticides is relatively complicated, involving processes such as chlorine substitution, hydrolysis and carboxyl group addition, and esterification, resulting in more complex chemical substances contained in wastewater, reflecting the following characteristics: (1) High concentration of organic pollutants; (2) Wastewater composition (3) Most of the waste water has high toxicity, inhibits microbial activity, and is difficult to biochemically degrade. Moreover, there are many substances such as chloride ion...

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Problems solved by technology

The existing loading materials are relatively simple, and the synthetic materials stay in the laboratory stage. They are easy to oxidize and difficult to store. This leads to the complex industrial sewage environment, and the effective reaction is inhibited. How to use the new composite nano-zero-valent iron material for practical application Pyridine-based derivatives of pesticide products have become hot

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