Department of Chemistry, University of Beira Interior, R. Marques de Avila e Bolama, 6201-001 Covilhã, Portugal; Research Unit of Textile and Paper Materials, R. Marques de Avila e Bolama, 6201-001 Covilhã, Portugal.
Department of Civil Engineering and Architecture, University of Beira Interior, Calçada Fonte do Lameiro, 6201-001 Covilhã, Portugal.
Bioresour Technol. 2013 Nov;147:143-151. doi: 10.1016/j.biortech.2013.07.154. Epub 2013 Aug 12.
Cork boiling wastewater pollutants were fractionated by sequential use of four ultrafiltration membranes and five fractions were obtained: four retentates (>100, 50-100, 20-50 and 10-20 kDa) and one permeate (<10 kDa); which were used to study the correlation of molecular size with biodegradability and toxicity before and after ozonation. The results show that molecular size is correlated with organic load and restrains biodegradability. The fraction with >100 kDa corresponds to 56% of the organic load and the one with <10 kDa only 8%. The biodegradability of fractions increased 182% with fractions molecular size reduction from >100 to <10 kDa and the chemical oxygen demand (COD) was from 3436 to 386 mg L(-1). For biodegradability enhancement the best outcome of ozonation was obtained with compounds having molecular size >20 kDa and range from 5% up to 175% for applied ozone doses to COD ratios between 0.15 and 0.38.
采用四级超滤膜对软木蒸煮废水污染物进行分级，得到五个级分：四个截留物（>100、50-100、20-50 和 10-20 kDa）和一个透过液（<10 kDa）；在臭氧氧化前后，用这些级分研究分子大小与可生物降解性和毒性的相关性。结果表明，分子大小与有机负荷有关，并限制了可生物降解性。>100 kDa 的级分对应于 56%的有机负荷，而<10 kDa 的级分仅为 8%。随着级分分子大小从>100 减小到<10 kDa，级分的可生物降解性增加了 182%，化学需氧量（COD）从 3436 增加到 386 mg L(-1)。对于可生物降解性的提高，用臭氧氧化获得的最佳结果是对具有分子大小>20 kDa 的化合物进行处理，应用臭氧剂量与 COD 比值在 0.15 到 0.38 之间，可提高 5%至 175%。
