评估染料浴废水中的染料回收和可重复使用潜力,使用前透膜进行最小液体排放
Maria Yasmeen1, Muhammad Saqib Nawaz2, Kamran Manzoor1
1School of Civil and Environmental Engineering (SCEE), Institute of Environmental Sciences and Engineering (IESE), National University of Sciences and Technology (NUST), Sector H-12, Islamabad, Pakistan.
Chemosphere
|July 7, 2023
概括
向前透有效地从织废水中回收和重复使用使用四甲基化 (TEAB) 作为吸水溶液的染料. 这种方法实现了高染料重聚和结构完整性,最大限度地减少污染,并使染料重复使用.
科学领域:
- 环境化学环境化学
- 水处理技术水处理技术
- 织行业 可持续性 织行业 可持续性
背景情况:
- 织品染色工艺产生大量含有反应性染料的废水,这给环境带来了挑战.
- 目前的染料处理方法通常涉及能源密集型工艺或导致二次污染.
- 高效的染料回收和再利用对于可持续的织制造至关重要.
研究的目的:
- 评估前透 (FO) 的潜力,从牛仔和聚废物中回收和重复使用染料.
- 为了优化FO的操作参数,以获得最大的染料回收和最小的溶液损失.
- 评估FO膜的化学稳定性和回收染料的结构完整性.
主要方法:
- 使用四乙化物 (TEAB) 作为吸水溶液 (DS) 采用前透 (FO).
- 进行了批量实验,以优化DS和料溶液 (FS) 度和温度.
- 半连续模式实验使用优化参数 (0.75M TEAB在60°C) 进行,以评估流量,逆溶液流量 (RSF) 和染料排斥.
主要成果:
- 优化的FO条件产生了高流量 (18L/m2/h) 和低RSF (0.4g/m2/h),100%的染料排斥.
- 染料浴废水中的染料再缩率在82%-98%之间,由于表面活性剂菌形成,RSF可以忽略不计.
- 使用NaOH和酸清洗膜,可回收约95%的流体,这表明可逆性污染和对反应性染料的良好化学稳定性.
结论:
- 使用TEAB进行前透是一种高效的方法,用于从织废水中回收和重复使用染料,实现高纯度和结构完整性.
- 经1HNMR证实,回收的染料适合在随后的染料批次中重复使用,从而促进了织品的循环经济.
- 稀释的TEAB吸水溶液可以作为织物洗剂和软化剂重新使用,进一步提高该过程的经济和环境可行性.
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