Removal Performances of Turbidity, Organics, and <inline-formula><math display="inline"><semantics><mrow><msubsup><mi>NH</mi><mn>4</mn><mn>+</mn></msubsup></mrow></semantics></math></inline-formula>-N in a Modified Settling Tank with Rotating Biological Discs Used for Enhancing Drinking Water Purification
Wendong Wang,
Chaokun Li,
Yingying Dong,
Zhiwen Chen,
Lan Yang,
Yulu Wei,
Kun Wu,
Hui Zhang,
Yinqiang Tian
Affiliations
Wendong Wang
School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Chaokun Li
School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Yingying Dong
School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Zhiwen Chen
School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Lan Yang
Yulin Chemical Company of Shaanxi Coal and Chemical Industry Group Co., Ltd., Yulin 719000, China
Yulu Wei
School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Kun Wu
School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Hui Zhang
School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Yinqiang Tian
Yulin Chemical Company of Shaanxi Coal and Chemical Industry Group Co., Ltd., Yulin 719000, China
In this study, a modified horizontal settling tank with rotating biological discs was developed to treat slightly polluted surface water, and its performance on the simultaneous removal of turbidity, organics, and NH4+-N was investigated on a lab scale. Results show that the effluent quality of the modified settling tank is stable in more than two months of continuous operation. At a hydraulic retention time (HRT) of 2.0 h, 73.65 ± 5.15% turbidity, 53.98 ± 5.17% TOC, and 77.01 ± 10.02%, NH4+-N could be removed by the modified settling tank with an average of 1.96 NTU turbidity, 1.98 mg/L TOC, and 0.46 mg/L NH4+-N residue in the effluent. Due to the improvement in DO supply, higher removal efficiencies of both organics and NH4+-N were achieved with increased disc rotating speed (r NH4+-N, respectively.
