Santos-Pereira Graziely Cristina, Corso Carlos Renato, Forss Jörgen
1Department of Built Environment and Energy Technology, Faculty of Technology, Linnaeus University, Växjö, Sweden.
2Department of Biochemistry and Microbiology, Institute of Biosciences, UNESP - São Paulo State University , Rio Claro, SP Brazil.
J Environ Health Sci Eng. 2019 May 29;17(2):633-643. doi: 10.1007/s40201-019-00377-8. eCollection 2019 Dec.
The MBBR solution has been applied for the textile wastewater treatment. However, in order to develop cost-effective solutions, waste biomass can be used as carrier. Rice husks are agricultural waste which have been used as an adsorbent of dyes; besides, they can provide and sustain suitable microorganism communities for the degradation of dyes. This study aimed to evaluate the biodegradation of the azo dye Direct Red 75 in two treatment systems with different carriers.
Bioreactor A was composed by an anaerobic bioreactor filled with Kaldnes K1 carriers employed in the MBBR technology and the study was performed in 2 different temperatures, 30 ± 0.5 °C and 21 ± 2 °C. Biofilter B was composed by a sequenced anaerobic-aerobic system with rice husks as carriers and this study was performed at 21 ± 2 °C. The rice husks was also employed as a source of microorganisms in both systems. Decolourization, surface area of the carriers and other parameters were analysed.
Biofilter B showed high rates of decolorization, mainly over 90% in all HRT tested (24, 48 and 12 h), presenting itself as a stable system, whereas Bioreactors A showed better performances with 48 h of HRT, about 85% for A at 30 ± 0.5 °C and 45% at 21 ± 2 °C. With a similar amount of carriers, analyses showed that rice husks had a much larger surface for microorganisms to grow on than Kaldnes K1.
The Biofilter B is a worthwhile system to be investigated and applied for the decolourization of textile wastewater treatment; for instance, in developing countries.
移动床生物膜反应器（MBBR）工艺已应用于纺织废水处理。然而，为了开发具有成本效益的解决方案，废弃生物质可作为载体。稻壳是一种农业废弃物，已被用作染料吸附剂；此外，它们可为染料降解提供并维持适宜的微生物群落。本研究旨在评估在两种采用不同载体的处理系统中偶氮染料直接红75的生物降解情况。
生物反应器A由一个填充有MBBR技术中使用的Kaldnes K1载体的厌氧生物反应器组成，研究在两个不同温度下进行，即30±0.5℃和21±2℃。生物滤池B由一个以稻壳为载体的序批式厌氧-好氧系统组成，该研究在21±2℃下进行。在两个系统中，稻壳也被用作微生物源。分析了脱色情况、载体表面积及其他参数。
生物滤池B显示出较高的脱色率，在所有测试的水力停留时间（24、48和12小时）下主要超过90%，表现为一个稳定的系统，而生物反应器A在水力停留时间为48小时时表现更好，在30±0.5℃时A的脱色率约为85%，在21±2℃时为45%。分析表明，在载体数量相似的情况下，稻壳比Kaldnes K1有更大的微生物生长表面。
生物滤池B是一个值得研究并应用于纺织废水脱色处理的系统；例如，在发展中国家。
