Effects of Hydraulic Loading Rate on the Removal of Pollutants from an Integrated Biological Settling Tank

• Published in: Huanjing kexue Vol. 37; no. 12; p. 4727
• Main Authors: Wang, Wen-Dong, Ma, Cui, Liu, Hui, Fan, Yin-Ping, Liu, Guo-Qi, Zhang, Ke
• Format: Journal Article
• Language: Chinese
• Published: China 08.12.2016
• Subjects: Bioreactors; Carbon; Nitrification; Nitrogen - isolation & purification; Phosphorus - isolation & purification; Waste Disposal, Fluid; Water Pollutants, Chemical - isolation & purification; Water Purification; micro-polluted water; rotating bio-disc; settling tank; biophase; hydraulic loading rate
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.201605214

Based on the designing concepts of rotating biological disk and settling tank, a hybrid biological purification and settling tank was developed to achieve simultaneous removal of turbidity causing materials, organic matters, NH -N, and TP. Experimental results showed that under certain rotary speed and water quality conditions, the removal rates of both turbidity and organic matters and NH -N were relatively stable first and then started to decrease with the increase of hydraulic loading rate. The highest value was achieved at 0.036 g·(m ·d) and 0.064 g·(m ·d) respectively. Compared with turbidity and TOC and NH -N, the removal rate of TP was greatly influenced by hydraulic loading rate. The average TP removal was the worst at 0.064 g·(m ·d) . Appropriately decreasing or increasing the hydraulic load was helpful to the phosphorus removal process. Further study showed that nitrification and dephosphorization processes competed for the limited carbon source and DO in the water phase. Along the flow direction, t