Development of an advanced biological treatment system applied to the removal of nitrogen and phosphorus using the sludge ceramics.
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.
Yang
Yufang
Y
Bio & Eco Engineering Section, National Institute for Environment Studies, Research Center for Material Cycles and Waste Management, Tsukuba 305-8506, Japan. yang.yufang@nies.go.jp
Inamori
Yuhei
Y
Ojima
Hitoshi
H
Machii
Hiroki
H
Shimizu
Yasutoshi
Y
D002448:Cell Adhesion; D002516:Ceramics; D004147:Dioxins / Q000032:analysis; D004572:Electrolysis; D005374:Filtration; D019015:Geologic Sediments; D005898:Glass; D007501:Iron / Q000737:chemistry; D009584:Nitrogen / Q000302:isolation & purification*; D010758:Phosphorus / Q000302:isolation & purification*; D016062:Porosity; D012722:Sewage; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000032:analysis; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
D004147:Dioxins; D012722:Sewage; D014874:Water Pollutants, Chemical; D014867:Water; D010758:Phosphorus; D007501:Iron; D009584:Nitrogen