Netpradit S, Thiravetyan P, Towprayoon S
The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, 91 Pracha-Utit Rd., Bangmod, Thungkru, 10140, Bangkok, Thailand.
Water Res. 2004 Jan;38(1):71-8. doi: 10.1016/j.watres.2003.09.007.
The capacity and performance of small-scale column, containing coarse particles of metal hydroxide sludge, were evaluated using 30mgl(-1) dye solutions of C.I. Reactive Red 141. The studied bed depths were 2.5-20cm and the studied flow rates were 1.1, 2.2 and 3.3mlmin(-1)cm(-2). At the breakthrough point of 0.1C(t)/C(0), the breakthrough volume was increased with increasing bed depth or decreasing flow rate, due to an increase in empty bed contact time (EBCT). The data followed the bed depth service time model, and the adsorption capacity was 24-26mgcm(-3) or 27-29mgdyesg(-1) adsorbent. The minimum bed depths should be higher 1.02, 2.04 and 2.59cm with flow rates of 1.1, 2.2 and 3.3mlmin(-1)cm(-2), respectively, while the ratio of bed depth to diameter should not be higher than 6. With EBCT above 5min, the usage rate of metal hydroxide sludge was 1.3gl(-1). Using the bed depth of 5cm and the flow rate of 0.55mlmin(-1)cm(-2), 87% of dominant colour, 78% of COD, and 99% of SS could be removed from the textile wastewater, and the leachate of toxic heavy metals was under the standard limitations.
使用浓度为30mgL⁻¹的C.I.活性红141染料溶液，对装有粗颗粒金属氢氧化物污泥的小型柱体的容量和性能进行了评估。研究的床层深度为2.5 - 20cm，研究的流速为1.1、2.2和3.3mlmin⁻¹cm⁻²。在穿透点为0.1C(t)/C(0)时，由于空床接触时间（EBCT）增加，穿透体积随床层深度增加或流速降低而增大。数据符合床层深度服务时间模型，吸附容量为24 - 26mgcm⁻³或27 - 29mg染料g⁻¹吸附剂。流速分别为1.1、2.2和3.3mlmin⁻¹cm⁻²时，最小床层深度应分别高于1.02、2.04和2.59cm，而床层深度与直径之比不应高于6。当EBCT高于5分钟时，金属氢氧化物污泥的使用率为1.3gL⁻¹。使用床层深度为5cm、流速为0.55mlmin⁻¹cm⁻²时，可从纺织废水中去除87%的主要颜色、78%的化学需氧量和99%的悬浮物，且有毒重金属的渗滤液低于标准限值。
