| Factors influencing ultra-filtration membrane treatment on P-RC APMP effluent, treatment effect and power consumption were studied. Biodegradability of ultrafiltration P-RC APMP treated by Aerobic activated sludge process was observed. The results indicated that process parameters with two experimental membranes of different molecular weight cutoffs (MWCO) were optimized. The optimized conditions of MWCO10k and20k-50k were as follows:feed flows900Lh"1and700L?h-1, operating pressures were0.107MPa and0.120MPa respectively, both of witch feed temperatures were40℃. Under the optimal conditions, to treat each one cubic meter of wastewater with UEOa2membrane, the power consumption was20.42kWh, the membrane flux was1.42L?m-2?h-1and removal rate of CODcr and rejection were51.28%and19.28%, respectively. With UPIS910membrane, the power consumption was12.88kWh per cubic meter of wastewater. The membrane flux, removal rate of COD, rejection, total solids content(TSS), volume concentration ratio and power consumption were7.23L?m-2?h-1,29.01%,15.66%,12.11%,40.0and12.88kWh respectively, the membrane flux was7.23L?m-2?h-1.Based on aerobic treatment, removal rate of raw effluent CODcr was39.62-43.68%and that of permeated liquid ultrafiltrated by20k-50k and10k ultrafiltration membrane were85.32-88.07%and85.32-88.07%, respectively. Based upon the test results, it is concluded that biodegradability of P-RC APMP pulping effluent can be improved by ultra-filtration.The impact on BCTMP pulping and bleachin effluent treated by ultrafiltration membrane was studied. When the commixed effluent was tultrafiltrated by MWCO6k ultrafiltration membrane, the removal rate of CODCr were64.94%and retention rate of concentration is42.73%. While treated by MWCO20k one, the results were43.47%and27.97%respectively. |
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