Abstract:According to the principle of reverse-colloid flocculation and the principle that the similar substance is more likely to be dissolved by each other, a type of inorganic mineral material bentonite (PRT) was used to conduct the enhanced primary treatment of landfill leachate in the incineration plant. The flocculation effects of the landfill leachate with PRT, PAC and C-PAM were investigated, and the synergistic effect of PRT and PAC was also investigated. The results showed that PAC and C-PAM had a certain flocculating effect of landfill leachate. When 8 mL PAC (3%) and 5 mL C-PAM (0.1%) were dosed into 250 mL 5-time diluted landfill leachate, the removal efficiencies of COD, turbidity, SS, NH3-N and TP were 23.1%, 93.4%, 91.1%, 1.2% and 96.7%, respectively. The unique charge characteristic and gravity of the PRT broke the ions balance of the landfill leachate and could produce a synergistic effect with PAC. With an addition of C-PAM in landfill leachate, good flocculation performance and high settling speed occurred. When the 2 g PRT, 8 mL PAC and 5 mL C-PAM were dosed into 250 mL 5-time diluted landfill leachate, the removal efficiencies of COD, turbidity, SS, NH3-N and TP in the supernatant reached 72.3%, 97.6%, 93.8%, 18.4% and 97.5%, respectively. The addition of PRT effectively promoted the flocculation performance. Compared with the traditional method, COD decreased from 16 483 mg·L?1 to 5 941 mg·L?1, and the turbidity of supernatant reached 10.4 NTU, the floating flocs could rapidly settle, which was more conducive to the subsequent separation and biochemical treatment. PAC addition had slight effect on the removal efficiency of NH3-N, while C-PAM had great effect on the removal of NH3-N, which qualitatively proved that the organic amine was the dominant species of ammonia nitrogen in the landfill leachate. The combination of PRT, PAC, and C-PAM was more efficient, and it also solved the technical problems that the loose and floating flocs were difficult to be separated after only PAC and C-PAM addition. Our study provided a scientific reference for establishing a new system for the subsequent biochemical treatment. Key words:landfill leachate/ bentonite/ enhanced primary treatment/ charge neutralization/ flocculation-sedimentation.
图1垃圾渗滤液絮凝前后效果图(左侧为原水，右侧为絮凝后) Figure1.Effect picture of landfill leachate before and after flocculation (raw water on the left and flocculated water on the right)
图4絮凝效果图(从左到右PRT投加量依次为絮凝前、0、1、2、3、4和5 g) Figure4.Flocculation effect picture (from left to right: PRT dosage is before flocculation, 0, 1, 2, 3, 4 and 5 g, respectively)
ZHANG H Y, CHEN D H, ZHENG Y, et al. Advanced processing of biologically-treated leachate by PAC[J]. Key Engineering Materials, 2011, 476(474): 1057-1062.
Department of Marine and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China Received Date: 2020-10-22 Accepted Date: 2021-01-29 Available Online: 2021-05-23 Keywords:landfill leachate/ bentonite/ enhanced primary treatment/ charge neutralization/ flocculation-sedimentation Abstract:According to the principle of reverse-colloid flocculation and the principle that the similar substance is more likely to be dissolved by each other, a type of inorganic mineral material bentonite (PRT) was used to conduct the enhanced primary treatment of landfill leachate in the incineration plant. The flocculation effects of the landfill leachate with PRT, PAC and C-PAM were investigated, and the synergistic effect of PRT and PAC was also investigated. The results showed that PAC and C-PAM had a certain flocculating effect of landfill leachate. When 8 mL PAC (3%) and 5 mL C-PAM (0.1%) were dosed into 250 mL 5-time diluted landfill leachate, the removal efficiencies of COD, turbidity, SS, NH3-N and TP were 23.1%, 93.4%, 91.1%, 1.2% and 96.7%, respectively. The unique charge characteristic and gravity of the PRT broke the ions balance of the landfill leachate and could produce a synergistic effect with PAC. With an addition of C-PAM in landfill leachate, good flocculation performance and high settling speed occurred. When the 2 g PRT, 8 mL PAC and 5 mL C-PAM were dosed into 250 mL 5-time diluted landfill leachate, the removal efficiencies of COD, turbidity, SS, NH3-N and TP in the supernatant reached 72.3%, 97.6%, 93.8%, 18.4% and 97.5%, respectively. The addition of PRT effectively promoted the flocculation performance. Compared with the traditional method, COD decreased from 16 483 mg·L?1 to 5 941 mg·L?1, and the turbidity of supernatant reached 10.4 NTU, the floating flocs could rapidly settle, which was more conducive to the subsequent separation and biochemical treatment. PAC addition had slight effect on the removal efficiency of NH3-N, while C-PAM had great effect on the removal of NH3-N, which qualitatively proved that the organic amine was the dominant species of ammonia nitrogen in the landfill leachate. The combination of PRT, PAC, and C-PAM was more efficient, and it also solved the technical problems that the loose and floating flocs were difficult to be separated after only PAC and C-PAM addition. Our study provided a scientific reference for establishing a new system for the subsequent biochemical treatment.
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