Traditionally the flowrate of returning activated sludge was measured by open channel flowrate meter with higher error, difficult transform of flowrate coefficients and inconvenient calibration.
以往常采用明渠流量计测回流污泥量，不仅误差大，而且流量系数转换、标定都十分困难。
Traditionally the flowrate of returning activated sludge was measured by open channel flowrate meter with higher error, difficult transform of flowrate coefficients and inconvenient calibration.
以往常采用明渠流量计测回流污泥量，不仅误差大，而且流量系数转换、标定都十分困难。
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