HANPei-jun,YUJun,HUXin-li,et al.Utilization of AAO+MBR Process for Land Saving Design of a Wastewater Treatment Plant with High Discharge Standard[J].China Water & Wastewater,2024,40(16):65-70.
Utilization of AAO+MBR Process for Land Saving Design of a Wastewater Treatment Plant with High Discharge Standard
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第16期
Page:
65-70
Column:
Date of publication:
2024-08-17
- Abstract:
- The influent of a wastewater treatment plant in Maoming mainly consists of urban domestic sewage, with a design capacity of 4.5×104 m3/d. The effluent quality is required to meet the quasi-class Ⅳ limit specified in Environmental Quality Standards for Surface Water (GB 3838-2002) (except TN), and achieves a remarkable 95% removal rates for BOD5, suspended solids (SS) and ammonia nitrogen (NH4+-N). The land use index is 0.35 m2/（m3·d-1）, which is only 1/3 of the recommended value in the relevant code. To comply with the effluent quality requirements and land use restrictions, the main process employed AAO+MBR, which demonstrated a significant reduction in land usage compared to the coagulation and precipitation advanced treatment process. The design sludge load for the biochemical tank was 0.065 kgBOD5/(kgMLSS·d), the design sludge concentration for the aerobic tank was 9 000 mg/L, and the design gas-water ratio was 4.9∶1. The three-stage sludge reflux system was utilized, with design reflux ratios of 300%, 200%, and 100% for each stage respectively. The membrane in MBR featured an immersed hollow fiber structure, a double-layer membrane frame, online cleaning, and a designed membrane flux of 18.8 L/(m2·h). The project cost was 2 250 yuan/m3, with equipment purchase cost accounting for 40%. After commissioning, glucose was added to the anoxic tank in case of insufficient carbon source, and polyaluminum chloride was dosed at the end of the aerobic tank if the biological phosphorus removal performance was unsatisfactory, ensuring stable effluent quality that met the discharge standard.
Last Update:
2024-08-17