Yang Yufang, Inamori Yuhei, Ojima Hitoshi, Machii Hiroki, Shimizu Yasutoshi
Bio & Eco Engineering Section, National Institute for Environment Studies, Research Center for Material Cycles and Waste Management, Tsukuba 305-8506, Japan.
Water Res. 2005 Dec;39(20):4859-68. doi: 10.1016/j.watres.2004.10.019. Epub 2005 Nov 28.
To develop a method of forming lake sediment into sludge ceramics with porosity and good biological adhesion for use as a medium for microorganisms in wastewater treatment, a study of the effects of forming conditions was conducted by adjusting the water content of sludge and compounding some additives. By adjusting the water content of the raw material at the kneading/pelletizing step to 40-42% and adding 3% waste glass to the raw materials to make up for the lack of flux, a sludge ceramic with a density in terms of specific gravity of saturated surface dry aggregate of about 1400 kg m(-3) was formed. In addition, to develop a small-scale wastewater treatment system capable of removing nitrogen and phosphorus, a sludge ceramic was applied as a medium for biological filtration. The results indicated that the BOD removal nitrification rate were superior to those of conventional ceramic media, reached at 95.3% and 87.4%, respectively. The introduction of iron electrolysis resulted in high treatment performance achieving BOD levels of 10 mg L(-1) or less, T-N of 10 mg L(-1) or less and T-P of 1 mg L(-1) or less.
为开发一种将湖泊沉积物制成具有孔隙率且生物附着力良好的污泥陶瓷的方法，以用作废水处理中微生物的介质，通过调整污泥含水量并添加一些添加剂，对成型条件的影响进行了研究。在捏合/造粒步骤将原料含水量调整至40 - 42%，并向原料中添加3%的废玻璃以弥补助熔剂的不足，形成了饱和面干集料比重密度约为1400 kg m(-3)的污泥陶瓷。此外，为开发一种能够去除氮和磷的小型废水处理系统，将污泥陶瓷用作生物过滤介质。结果表明，生化需氧量（BOD）去除率和硝化率优于传统陶瓷介质，分别达到95.3%和87.4%。引入铁电解导致处理性能良好，生化需氧量水平达到10 mg L(-1)或更低，总氮（T-N）为10 mg L(-1)或更低，总磷（T-P）为1 mg L(-1)或更低。
