Preparation method of high-activity iron-carbon micro-electrolysis filler

Abstract

The invention relates to a preparation method of high-activity iron-carbon micro-electrolysis filler, belongs to the technical field of sewage treatment and is applicable to treatment of municipal sewage as well as industrial sewage such as pharmaceutical wastewater, heavy metal wastewater, printing and dyeing wastewater and the like. The filler is prepared from an iron-based material, a carbon-based material and a binder by homogenization treatment, carbonization treatment, mechanical forming treatment and high-temperature sintering treatment sequentially. The prepared iron-carbon micro-electrolysis filler can substantially increase the quantity of micro-primary batteries in unit volume, iron-carbon contact area, electron transfer efficiency and electrical conductivity of a material, hashigher reaction rate, can realize advanced purification treatment of sewage, effectively broadens the application range of micro-electrolysis, solves the problems of hardening and passivation, shows good stability and long effectiveness and has reduced operation cost and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a preparation method of a highly active iron-carbon micro-electrolytic filler, which is suitable for the treatment of industrial sewage such as urban sewage, pharmaceutical wastewater, heavy metal wastewater, and printing and dyeing wastewater. Background technique [0002] Micro-electrolysis technology is based on the synergistic treatment effect of oxidation-reduction reaction, which realizes the chain scission of macromolecular organic matter and the reduction of oxidative substances in wastewater, so as to degrade or remove organic pollutants in wastewater and improve the biodegradable coefficient (BOD / COD), to achieve the purpose of (pre)treatment of wastewater. Because of its simple process and convenient operation, it is a widely researched and applied wastewater treatment technology. This technology is generally applied to the pretreatment process o...

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Problems solved by technology

[0004] However, the iron-carbon micro-electrolytic fillers disclosed in relevant literatures and the commercial micro-electrolytic fillers on the market all have a common problem in that: the primary battery composed of solid particle-type iron-carbon raw materials is strictly speaking angelica. For batteries or relative micro-batteries, since the number of micro-primary batteries that form an effective electrochemical degradation reaction to organic pollutants will be significantly affected by the particle size and quantity of material particles, the number of micro-primary batteries per unit volume is limited, and sewage treatment The current density of the process is low, and the ability to improve the efficiency of sewage treatment through the above improvement methods is limited

Moreover, since the anode iron used as the corrosion electrode is mainly consumed during use, the cathode carbon is not lost. In order to ensure the effective equivalent ratio of the primary battery, the volume ratio of filler iron to carbon is usually close to 1:1, resulting in excessive carbon. Iron active sites, reducing processing efficiency

In addition, iron and carbon in traditional fillers are physically mixed. On the one hand, the distribution of iron and carbon is uneven, and an isolation layer is easily formed between electrode materials or separated by washing, making micro-electrolysis useless; on the other hand, iron materials in direct contact It is easy to rust and harden, which reduces the effect of sewage treatment, and requires frequent replacement of micro-electrolysis materials. Not only is the workload high and the cost is high, it also affects the treatment effect and efficiency of wastewater, which restricts the promotion and application of micro-electrolysis technology.

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