Recovery of Sodium Sulfate from Farm Drainage Salt for Use in Reactive Dyeing of Cotton

详细信息    查看全文

• 作者：Jiyoon Jung and Gang Sun
• 刊名：Environmental Science & Technology
• 出版年：2001
• 出版时间：August 15, 2001
• 年：2001
• 卷：35
• 期：16
• 页码：3391 - 3395
• 全文大小：66K
• 年卷期：v.35,no.16(August 15, 2001)
• ISSN：1520-5851

文摘

Agricultural drainage salt generated during irrigation ofcrops in San Joaquin Valley, California, exceeds 600 000 tonsannually and cumulates in the field at a rapid rate. As aresult, the waste is occupying more farmland for salt storageand disposal, thus causing serious concern to theenvironment and the local agricultural industry. In searchingfor a potential solution to reduce or eliminate the waste,the research describe herein explored the feasibility ofproducing a value-added product, sodium sulfate, from thewaste and utilizing the product in textile dyeing. Theresults indicated that sodium sulfate could be producedfrom the salt and could be purified by a recrystalizationmethod in a temperature range within the highest and lowestdaily temperatures during summer in the valley. Therecovered sodium sulfate samples, with purities rangingfrom 67 to 99.91%, were compared with commercially availablesodium sulfate used in reactive dyeing of cotton fabrics.The salt samples recovered from Mendota, California (>98.8%sodium sulfate), cause little color difference in thedyeing with selected reactive dyes. The purified salt (III)(99.91% sodium sulfate) is more applicable for reactive dyeingof cotton fabrics since it has no deleterious effect. Therecovered sodium sulfate from certain areas in the valleycould not be employed in reactive dyeing due to thehigh level of impurities present.