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Three different raw OMW samples (A, B, and C) were collected in sealable metal containers from the northern part of Jordan (Irbid) during the olive fruit harvesting season of the year 2014 and stored at 4 °C. Sample A is the milling wastewater, Sample B is the mixture of olive washing and milling wastewater, and sample C is the washing wastewater. Due to the high content of total suspended solids, the three samples were filtered using a medium crystalline filter paper and then they were centrifuged for 60 minutes at 6,000 rpm. The measurements were repeated to improve averaging. The main physiochemical properties of the three samples prior to and after filtration processes are given in Table 1.

Table 1

Physiochemical properties of OMW samples A, B and C before and after filtration processes

 A
B
C
PropertiesBeforeAfterBeforeAfterBeforeAfter
pH 4.84 5.00 4.48 4.33 6.91 7.07 
Conductivity (mS) 8.75 11.37 5.82 7.41 1709 1985 
Turbidity (NTU) 9,354.2 283.87 2,049.2 85.5 54.9 9.79 
Soluble chemical oxygen demand SCOD (g/L) 72.9 33.8 0.18 
Total solids TS (mg/L) 59,815 59,800 27,130 24,875 2,360 2,295 
Total volatile solids TVS (mg/L) 37,020 35,350 17,295 15,600 1,220 1,090 
 A
B
C
PropertiesBeforeAfterBeforeAfterBeforeAfter
pH 4.84 5.00 4.48 4.33 6.91 7.07 
Conductivity (mS) 8.75 11.37 5.82 7.41 1709 1985 
Turbidity (NTU) 9,354.2 283.87 2,049.2 85.5 54.9 9.79 
Soluble chemical oxygen demand SCOD (g/L) 72.9 33.8 0.18 
Total solids TS (mg/L) 59,815 59,800 27,130 24,875 2,360 2,295 
Total volatile solids TVS (mg/L) 37,020 35,350 17,295 15,600 1,220 1,090 

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