摘要：
针对河北某富硒面粉厂洗麦过程产生的高浓度含硒废水，对比和优化了混凝（4种絮凝剂）和电絮凝（Fe、Al阳极）两种工艺的处理效果。混凝实验结果表明，三氯化铁（FeCl3）对含硒废水的处理效果优于其他3种混凝剂（聚合氯化铝、聚合硫酸铁、硫酸铝），在投加量2 500 mg/L、初始pH=5条件下，Se和COD去除率达到最佳，分别达到90%和35%。电絮凝实验结果表明，电流密度和pH对Se去除效果影响显著，高电流密度和酸性环境更有利于Se和COD的去除。采用Fe阳极，在电流密度为40 mA/cm2和初始pH=4条件下，电絮凝120 min后，Se和COD去除率分别达到99.5%和52%，出水Se质量浓度降至1.70 mg/L，远低于企业排放限值（<5 mg/L）。此外，三维荧光光谱分析表明，电絮凝对废水中的芳香族蛋白质和可溶性微生物副产物的去除效果优于混凝法。综合考虑处理效能与技术经济性，电絮凝法更适合该厂含硒废水的高效处理。
关键词:
含硒废水,
混凝,
电絮凝
Abstract:
In response to the high concentration selenium-containing wastewater generated during the wheat washing process at a flour factory in Hebei Province, the treatment effects of two processes, coagulation (4 types of coagulants) and electrocoagulation (Fe, Al electrodes), were compared and optimized. The results of the coagulation experiments showed that ferric chloride(FeCl3) had a better treatment effect on selenium-containing wastewater than the other three coagulants (polyaluminum chloride, polymeric ferric sulfate, and aluminum sulfate). Under the conditions of dosage of 2 500 mg/L and initial pH of 5, the removal rates of Se and COD reached the best as 90% and 35%, respectively. The results of the electrocoagulation experiments showed that current density and pH had a significant impact on Se removal, and high current density and acidic environment were more conducive to the removal of Se and COD. By using Fe anode, under the conditions of current density of 40 mA/cm2 and initial pH of 4, after 120 minutes of electrocoagulation, the removal rates of Se and COD reached 99.5% and 52%, respectively. The Se mass concentration in effluent decreased to 1.70 mg/L, far lower than the enterprise emission limit (<5 mg/L). In addition, three-dimensional fluorescence spectroscopy analysis showed that electrocoagulation had better removal effect on aromatic proteins and soluble microbial products in wastewater than coagulation method. Taking into account treatment efficiency and technical economy, electrocoagulation was more suitable for the efficient treatment of selenium-containing wastewater in this factory.
Key words:
selenium-containing wastewater,
flocculation,
electrocoagulation
中图分类号:
张健, 张忠国, 何灿, 韩军兴, 单悦, 宫晨皓. 混凝与电絮凝工艺处理富硒面粉废水的效能对比与优化[J]. 工业水处理, 2025, 45(9): 160-166.
Jian ZHANG, Zhongguo ZHANG, Can HE, Junxing HAN, Yue SHAN, Chenhao GONG. Comparison and optimization of the efficiency of coagulation and electrocoagulation processes in treating selenium rich flour wastewater[J]. Industrial Water Treatment, 2025, 45(9): 160-166.