膜分离集成技术处理冶金企业废水及工程示范

发布时间：2018-04-10 01:04

  本文选题：冶金废水　切入点：酸性废水　出处：《天津工业大学》2017年硕士论文

【摘要】：冶金工业废水排放量大、成分复杂含各种有机和无机浮选药剂,重金属离子、盐分等含量非常高,已经成为水处理领域全球性难题。针对冶金企业不同来源的污水,本文开展膜分离集成技术处理冶金企业废水及工程示范研究,以实现废水处理及资源化利用。本文以湖北省某冶金企业生产的废水为例,筛选了几种不同来源的废水并采用Fenton氧化、超滤、膜蒸馏等先进的水处理工艺进行处理。真空泵循环水处理工艺研究结果发现,经过Fenton氧化-超滤工艺处理后水质清澈,浊度由4.76MTU 降到 0.04NTU,COD 由 340 降到 33.20mg/L,油含量由 1.15 mg/L 降到0.41 mg/L。这表明该工艺对浊度、油和有机物有了很好的去除,废水回收率可达到90%以上,完全满足回用指标要求,可以进行中试示范。外排废水经过超滤-除盐工艺(化学沉淀法,纳滤或膜蒸馏)处理。结果表明,传统的硫化剂沉淀法对于除盐效果不好。纳滤处理使电导从115000 S/m降低到83500S/m,盐浓度有一定降低,但是浓度依然很高。絮凝沉淀-膜蒸馏技术可以实现70%的水回用,其余30%的水可以通过沉淀或者萃取等手段分离水中的重金属离子。但是膜蒸馏尚处于实验阶段,对于扩大化生产还有一定的难度。最后,本文完成了 Fenton氧化-砂滤-超滤集成工艺处理酸性真空泵工作水设计方案,并建立了 200m3/天示范工程系统。废水处理后达到回用率大于90%,其中产水水质COD≤100mg/L,油含量≤0.50mg/L,浊度≤0.2NTU,满足企业回用水质指标要求。通过二年的实际运行数据验证工艺的可靠性,为TIPS法PVDF超滤膜在强酸性环境下稳定运行提供参考数据。该工艺经济分析显示其每年可回用2.64-3.90万m3废水,同时可以实现节约自来水和减少废水排量的目的,具有良好的经济和社会效益。
[Abstract]:The wastewater of metallurgical industry has been a global problem in the field of water treatment because of its large amount of discharge, complex composition and various organic and inorganic flotation reagents, heavy metal ions, salt and so on.Aiming at the wastewater from different sources of metallurgical enterprises, this paper carried out a demonstration study on the treatment of wastewater from metallurgical enterprises by membrane separation and integration technology and engineering demonstration, in order to realize the treatment of wastewater and utilization of resources.Taking wastewater from a metallurgical enterprise in Hubei province as an example, several kinds of wastewater from different sources were screened and treated by advanced water treatment processes such as Fenton oxidation, ultrafiltration and membrane distillation.The results of vacuum pump circulating water treatment showed that after Fenton oxidation and ultrafiltration treatment, the water quality was clear, the turbidity was decreased from 340 to 0.04NTUUCOD from 340 to 33.20 mg / L, and the oil content was reduced from 1.15 mg/L to 0.41 mg / L.This shows that the process can remove turbidity, oil and organic matter well, and the recovery rate of wastewater can reach more than 90%, which fully meets the requirements of reuse index and can be demonstrated in pilot test.Effluents are treated by ultrafiltration-desalination (chemical precipitation, nanofiltration or membrane distillation).The results show that the traditional precipitation method of vulcanizing agent is not good for desalting.Nanofiltration reduced the conductance from 115000 S / m to 83500S / m, and the salt concentration decreased, but the concentration was still very high.The flocculation precipitation-membrane distillation technique can reuse 70% of the water, and the remaining 30% of the water can be separated by precipitation or extraction.However, membrane distillation is still in the experimental stage, and it is still difficult to enlarge the production.Finally, the design scheme of Fenton oxidation-sand filter-ultrafiltration integrated process for the treatment of acid vacuum pump working water is completed, and the 200m3/ days demonstration engineering system is established.After wastewater treatment, the reuse rate is more than 90, in which the water quality COD 鈮，

本文编号：1728950