In this study, the performance of the horizontal sub-surface flow filter (HSSFF) and constructed wetland (HSSFCW) experimental units enhanced with earthworms was investigated for the treatment of construction camp sewage wastewater. All the experimental units (filter and constructed wetland) were filled with the same filler except Eisenia foetida earthworms and Lolium perenne Linn plants. The performance of the earthworm-enhanced filter (EEF) and the earthworm-enhanced constructed wetland (EECW) was compared to that of the blank filter (BF) units. The results revealed that the removal efficiencies for chemical oxygen demand (COD), ammonium-nitrogen (NH4+-N), total nitrogen (TN) and total phosphorus (TP) in EEF were higher than the BF unit. In order to optimize the operating conditions, the experiments were conducted in three different water levels. The results revealed that the removal efficiencies of EEF for these pollutants are the highest in experimental conditions no. 2 (water level ~30 cm; HRT ~3 days; hydraulic load ~4.05 cm/day; and Inflow discharge ~0.27 L/h). Compared to the EEF and BF units, the EECW has higher removal efficiency for COD and TN and has more stable performance than the filters. This work will aid the design and improvement of filters and CWs for treatment of effluent wastewater from construction camps. The selection of appropriate hydraulic parameters and experimental conditions could be very beneficial in achieving the goal of implantation of low impact development (LID).
Anaerobic/Anoxic/Oxic (A/A/O) process is applied widely in municipal wastewater treatmen plants, which attribute to good perfromance for nutrient removal. However the design parameter of A/A/O process is mainly from experiments based on stable flow rate. So performance parameter of any WWTP must be modified according to actual conditions. Othewise, peformance efficiency of the WWTP can not meet initial design properties and it maybe result in serious energy waste. According to the experiences of start-up, commissioning, operation control and performance test of Anaerobic/Anoxic/Oxic (A/A/O) process in wastewater treatment plant (WWTP), the notions on successful start-up and effective operation are summarized and analyzed. The countermeasures on the variety of influent, the control of DO and sludge system to keep WWTP operating economically and stably are presented.
The text analyzed mining method of Macheng Iron Ore. It put forward two projects about afterwards filling mining methods for large and thick inclined ore bodies: phase drilling, ore drawing as well as sublevel drilling and phase ore drawing, according to the thickness of inclined mine. It is greatly propitious to the mine building.
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