摘要
在上向流臭氧—生物活性炭技术中,炭层的膨胀率是水厂工艺设计及运行的重要参数。通过对生物活性炭池膨胀率的测定,研究活性炭粒径、反冲洗、运行时间及温度等因素对膨胀率的影响。结果表明:不同类型的活性炭,其膨胀特性有很大的差别。颗粒粒径较大的8×30目活性炭颗粒,在15m/h的流速下不发生膨胀;粒径30×60目活性炭颗粒在5m/h的上升流速下已经能达到25%的膨胀率。而12×40目活性炭颗粒,在12m/h的流速下膨胀率为10%,建议水厂设计时选用此粒径范围的活性炭;该条件下在运行一段时间后,活性炭颗粒密度增加,膨胀率下降约5%;反冲洗后,活性炭外层老化生物膜脱落,密度增大,膨胀率下降约2.3%;水温对活性炭的膨胀率也有影响,从12℃到17℃,水温提高5℃,膨胀率下降约2.7%。
In up-flow O3-BAC process, the expansion curve of granular activated carbon （GAC） is a key parameter for water treatment process design and operation. Through the test of the expansion curves of biological activated carbon （BAC）, the influences of GAC diameter, back-washing, operation time and temperature on expansion curves were studied. The results showed that there were different expansion curves in different GAC： there was no expansion in 8 X 30 mesh GAC in 15 m/h flow rate; the expansion curve of 30×60 mesh GAC was 25% in the flow rate of 5 m/h;the expansion curve of 12×40 mesh GAC was 10% in the 12 m/h flow rate. The 12 × 40 mesh GAC was recommended for water treatment plant de- sign. In 12 m/h up-flow rate, the 12X40 mesh GAC density would increase and its expansion curve would decrease about 5 % after a period of operation. After baek-washing the aged biological film on GAC would separate from the GAC, its density would increase and expansion curve would decrease about 2. 3%. The temperature also had influences on GAD expansion curve： from 12℃ to 17 ~Cthe expansion curve would decrease about 2. 7 % with the temperature increase of 5℃.
出处
《给水排水》
CSCD
北大核心
2013年第3期115-120,共6页
Water & Wastewater Engineering
关键词
上向流
活性炭床
膨胀率
活性炭粒径
Up-flow
Activated carbon bed
Expansion curve
Activated earhon diameter
