The greatest joy one can experience is when, after some effort, everything gradually transforms into what you desire. Iron-carbon microelectrolysis is a wastewater treatment process in which iron and carbon spontaneously generate a weak electric current in an electrolyte solution to decompose pollutants in wastewater. The large amount of nascent Fe2+ and nascent [?H] produced by this process exhibit extremely high chemical activity, capable of altering the structure and characteristics of many organic compounds in the wastewater, leading to chain scission, ring opening, and other reactions. The iron-carbon microelectrolysis process integrates multiple functions such as oxidation, reduction, electrodeposition, flocculation, adsorption, bridging, sweeping, and co-precipitation.
Papermaking wastewater mainly originates from steaming, washing, screening, and bleaching during the pulping process. The wastewater contains a large amount of lignin and other substances that are difficult to biodegrade. Many papermaking enterprises fail to meet the national first-level standard for water pollutant emissions in the papermaking industry in terms of various emission indicators such as CODCr and chromaticity after undergoing primary physicochemical and secondary biochemical treatments. After chemical micro-electrolysis reaction, Ca(OH)2 is used to adjust the pH value of the effluent to neutral, and it reacts with Fe2+ and Fe3+ in the electrolyte to form Fe(OH)2 and Fe(OH)3 flocs, which further trap CODCr in the water and remove Fe2+, Fe3+, and SO42+ ions from the water, thereby further improving the chromaticity of the solution. Compared with conventional treatment methods, the micro-electrolysis catalytic process has outstanding effects in the treatment of low-concentration and refractory organic wastewater. Its advantage lies in the fact that it utilizes micro-electrolysis materials filled in the wastewater to generate a 1.2V potential difference for electrolytic treatment of the wastewater without electricity, thus achieving the purpose of degrading organic pollutants.
After the system is filled with water, countless micro-battery systems will form inside the equipment, constituting an electric field in their active space. During the treatment process, nascent [H] and Fe2+ generated can undergo redox reactions with many components in the wastewater, such as destroying the chromogenic or auxochrome groups of colored substances in colored wastewater, or even breaking the chain, achieving decolorization and degradation. The generated Fe2+ is further oxidized to Fe3+, and their hydrates exhibit strong adsorption-flocculation activity. Especially after adding alkali to adjust the pH value, ferrous hydroxide and ferric hydroxide colloidal flocculants are generated, whose adsorption capacity is far higher than that of ferric hydroxide colloids obtained through general chemical hydrolysis. They can adsorb a large number of tiny particles, metal particles, and organic macromolecules dispersed in the water. Its working principle is based on the combined action of electrochemistry, oxidation-reducti
造纸废水主要来源于制浆过程中的蒸煮、清洗、筛分、漂白。废水中含有大量的木质素等难以生物降解的物质，许多的造纸企业在经过一级物化、二级生化处理后出水的CODCr、色度等各项排放指标都不能达到国家造纸工业水污染物排放一级标准。化微电解反应后，用Ca(OH)2调节出水的pH值至中性，并与电解液中的Fe2+和Fe3+生成Fe(OH)2和Fe(OH)3絮体，进一步网捕水中的CODCr并去除了水中的Fe2+和Fe3+以及SO42+等离子，使溶液的色度进一步得到改善与常规处理方法相比,微电解催化工艺在低浓度、难降解有机废水的处理方面具有突出的效果,其优点在于它是在不通电的情况下,利用填充在废水中的微电解材料自身产生1.2V电位差对废水进行电解处理，以达到降解有机污染物的目的。
当系统通水后，设备内会形成无数的微电池系统,在其作用空间构成一个电场。在处理过程中产生的新生态[H] 、Fe2 + 等能与废水中的许多组分发生氧化还原反应，比如能破坏有色废水中的有色物质的发色基团或助色基团，甚至断链，达到降解脱色的作用；生成的Fe2 + 进一步氧化成Fe3 +，它们的水合物具有较强的吸附- 絮凝活性，特别是在加碱调pH 值后生成氢氧化亚铁和氢氧化铁胶体絮凝剂，它们的吸附能力远远高于一般药剂水解得到的氢氧化铁胶体，能大量吸附水中分散的微小颗粒，金属粒子及有机大分子。其工作原理基于电化学、氧化- 还原、物理吸附以及絮凝沉淀的共同作用对废水进行处理。