DTC类重捕剂在化学镀镍浓废液深度除镍中的应用研究

以催化氧化还原预处理后的化学镀镍浓废液为对象,通过使用DTC(二硫代氨基甲酸盐)类复合重捕剂对其进行深度除镍,研究了重捕剂用量、反应时间、初始pH、反应温度和初始镍浓度对处理效果的影响。结果表明,在重捕剂用量为600 mg/L、初始pH为7、反应温度为25℃的条件下,反应3 min后即可将镍浓度从24.5 mg/L稳定降低至0.05 mg/L,镍去除率高达99.8%,符合电镀废水中重金属镍的排放要求。

电氧化设备在高浓废液处置中的应用探讨

近几年,我国农药产量呈显著上升趋势,仅2019年上半年农药原药产量就达到了86.8万t.农药在生产过程中会产生大量废水,这些废水中污染种类繁多、水质复杂、化学需氧量高,含有大量难以生物降解的物质,盐分高、有恶臭气味,对人的健康有较为严重的影响.文章利用电氧化实验设备对高浓农药废液进行实验处置,并最终论证电氧化设备可以在农药废液处置中应用.

新排放标准下电镀园区废水处理转型与发展趋势的探讨

在新的环保形势下,探讨电镀园区废水处理思路和方法的转型突破。本文重点阐述了对电镀园区高浓度废水处理必要性和重要性,分析了电镀园区高浓废液处理工艺及发展趋势,以期为相关同行提供参考。

电镀废水稳定达标排放的解决思路

从工艺、源头管理和现场管理等方面总结了许多电镀企业处理后的废水无法稳定达标的原因,并提出了增加混排水处理工艺,加强源头浓废液管理,加强水质分析化验,将废水处理设施交给第三方运管等实现稳定达标排放的解决思路。

Kinetics of Reductive Leaching of Low-grade Pyrolusite with Molasses Alcohol Wastewater in H_2SO_4

The kinetics of reductive leaching of manganese from low grade pyrolusite in dilute sulfuric acid in the presence of molasses alcohol wastewater was investigated. The shrinking core model was applied to quantify the effects of reaction parameters on leaching rate. The leaching rate increases with reaction temperature, concentrations of H 2 SO 4 and organic matter in molasses alcohol wastewater increase and ore particle size decreases. The leaching process follows the kinetics of a shrinking core model and the apparent activation energy is 57.5 kJ·mol –1 . The experimental results indicate a reaction order of 0.52 for H2SO4 concentration and 0.90 for chemical oxygen demand (COD) of molasses alcohol wastewater. It is concluded that the reductive leaching of pyrolusite with molasses alcohol wastewater is controlled by the diffusion through the ash/inert layer composed of the associated minerals.