斯洛伐克共和国-1500个调值单位膜单元

1, PERFORMANCE PARAMETERSMembrane MaterialPVCMolecular Weight Cut-off (MWCO)100.000 DaltonsInner and outer diameters of hollow-fiber0.9mm/1.6mmMembrane fiber typeInside-out hollow-fiberCharacteristics of membrane structureHydrophilic double-compact layersExternal ShapeHollow fiber2, APPLICATION CONDITIONSPre - filtration50-150 umMax turbidity of inlet water≤ 15 NTU Rated flux60 – 160 L/M/H Running modeCross-flow filtration or dead end filtrationMax inlet water pressure0.45 MPaPressure difference of transmembrane at 20°C (TMP)28 – 150 KPa Max pressure difference of transmembrane0.2 MPaApplicable PH range2 – 12Applicable temperature5 °C - 45 °CTolerable continuous residual chlorine100 PPmTolerable interval residual chlorine200 PPm3, BACKWASHING DESIGNBackwashing pressure0.25 MPaBackwashing flow220 – 300 L/M/HBackwashing frequencyEvery 20 -60 minutesBackwashing time30 – 60 seconds every timeFrequency of chemically enhanced ( CEB )Auto adding of additives in backwashing is recommended.Time of chemically enhanced backwashing ( CEB )30 – 60 seconds every time4, CHEMICALLY WASHING DESIGNFrequency of chemically washing Every 1 4 months or when TMP is over 0.15 MPaPressure of chemically washing0.15 MPaFlow of chemically washing200 – 250 L/M/HTime of chemically washing60 – 90 minutes every timeAcid washing chemicalCitric acid or oxalic acid ( mixed into solution with PH = 2 )Alkali washing chemicalNaOH ( mixed into solution with PH=12)5, INDEX OF OUTPUT WATER Turbidity of output water< 0.1 NTUIndex of silt density< 1.5Microorganism, pathogen99.9 % Removed Remarks:1. Pure water flux is measured with pure water at 25°C with inlet water pressure of 0.1MPa. 2. If water are from surface water,river water or well water and so on,pre-treatment shall be done. It is suggested that a 50-150 um precision filter shall be equipped to have inlet water with turbidity ≤15NTU.