During the eleventh five-year period, the Hunhe River was treated synthetically, which made the water quality changed from anaerobic heavy pollution to aerobic light pollution.
The overall aerobic quantity cam completely reflect the pollution degree of reducing matter in water.
需氧量 能完全反映水中还原性物质的污染程度。
3
In aerobic wastewater treatment system, large amount of complicated ingredient sludge are formed. If not being disposed properly, the sludge can cause secondary pollution to environment.