PENGJin-yu,LIZhen-bang,ZHANGKun-qian,et al.Application of Pre-ozone and Biological Fluidized Bed in Updating and Transformation of Waterworks[J].China Water & Wastewater,2024,40(12):94-100.
前置臭氧-生物流化床工艺用于水厂提质改造
- Title:
- Application of Pre-ozone and Biological Fluidized Bed in Updating and Transformation of Waterworks
- Keywords:
- ozone catalytic oxidation; biological fluidized bed; 2-methylisobornyl alcohol; dissolved organic carbon (DOC); particulate matter
- 摘要:
- 为进一步提高供水水质，满足《生活饮用水卫生标准》（GB 5749—2022）要求，山东某水厂（处理水量为4×104 m3/d）在常规工艺前增设了臭氧催化氧化-生物流化床工艺。新工艺投产后，滤池出水2-MIB与GSM降至检出限以下，氨氮降至0.02 mg/L以内，DOC降至2.7 mg/L，其中新增工艺对溶解性有机碳（DOC）去除贡献占比为88.8%，高通量测序结果表明生物流化床上负载了Gemmatimonas等微生物；沉淀池出水颗粒物总数自改造前的15 959 CNT/mL降至4 963 CNT/mL，形成的絮体具有三维密实的立体结构，滤后水颗粒物总数降至416 CNT/mL，浑浊度降至0.08 NTU；供水水质全面提升，且在连续运行中稳定可靠。实践证明，先行去除水中有机物的设计思路在该水厂行之有效，不但可高效去除2-MIB、DOC、氨氮等污染物，也提高了混凝脱稳效率，强化了后续常规处理工艺对颗粒物的去除效果。
- Abstract:
- In order to enhance water quality and comply with Standards for Drinking Water Quality (GB 5749-2022), the ozone catalytic oxidation and biological fluidized bed process was constructed before the conventional process at a waterworks in Shandong, with water treatment capacity of 4×104 m3/d. After the operation of the new process, the concentrations of 2-methylisoborneol (2-MIB) and geosmin (GSM) in the filter effluent were reduced to below the detection limit. Ammonia nitrogen was reduced to within 0.02 mg/L, and dissolved organic carbon (DOC) was reduced to 2.7 mg/L. Notably, the additional process contributed 88.8% to the removal of DOC, and high-throughput sequencing revealed the presence of microorganisms such as Gemmatimonas on the biological fluidized bed. Regarding turbidity and particulate matter, the total particle matter amount in the sedimentation effluent decreased from 15 959 CNT/mL before the retrofit to 4 963 CNT/mL, and the formed flocs had a three-dimensional dense structure. The total particle matter amount in the filtered water further decreased to 416 CNT/mL, and turbidity decreased to 0.08 NTU, resulting in a comprehensive improvement of supply water quality, and the process exhibited stability during continuous operation. This demonstrates the design concept of proactively removing organic matter is effective in this waterworks, which not only efficiently removes 2-MIB, DOC, and ammonia nitrogen, but also enhances the coagulation and destabilization efficiency, and strengthens removal effect of turbidity and particulate matter in the subsequent conventional treatment process.
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