Disposal of OME Through Submarine Outfalls

With regard to olive industry wastewater, which is mainly characterized by a high content of polyphenols, fats, COD, and solid matters, Table 17 shows that sea water can play a role in the treatment and disposal of biodegradable organics. Refractory organics should be subjected to proper treatment at the source (mill). Fats, floatables, settleable and suspended solids should be pretreated by rotary screens or milliscreens and primary sedimentation. It is possible to treat polyphenols by the decolorization process, which has demonstrated significant correlation

Table 17 The Role of Sea Water in Removal of Wastewater Constituents and the Required Pretreatment Process Prior to Sea Discharge Through Submarine Outfalls

Constituent

Pretreatment

The required process

Particle

Oil, fats, and floatables

Biodegradable organics

Nutrients

Pathogenic bacteria Refractory organics Heavy metals

Partly needed Mechanical pretreatment (preliminary treatment+ primary sedimentation)

Needed

Not needed

Not needed Not needed Needed Needed

Proper treatment at source Proper treatment at source

Table 18 Removal of Wastewater Constituents by Milliscreens and Primary Treatment

_Percentage removal_

Milliscreens

Constituent 0.5 mm apertures 1.0 mm apertures Primary treatment

Table 18 Removal of Wastewater Constituents by Milliscreens and Primary Treatment

Constituent 0.5 mm apertures 1.0 mm apertures Primary treatment

Settleable solids

43

23

95-100

Suspended solids

15

10

50

Oil and grease

43

30

50-55

Floatable solids

99

96

95-100

between the sewage decolorization and reduction of total organic carbon and phenolic content. It is also advisable to conduct intensive research about sea water's role in reducing these compounds. In cases where pH is less than or equal to 5, it is necessary to apply neutralization within the pretreatment. The criteria given in Table 16 can be referred to for planning and designing the submarine outfalls. Other references provide further details about design criteria and modeling [85]. For economic reasons, it is recommended that several neighboring mills associate in one submarine outfall.

The possible impact of effluents on public health and the environment (aesthetic) should be assessed through monitoring stations for effluent discharge and bathing water (Fig. 21) to achieve national or international standards (fats, COD, and polyphenols).

Müñi(«Wg jlatióos f(W AWÍSS in; waHf quality in hatling witcn

Figure 21 Monitoring stations location for olive oil mill wastewater discharge through submarine outfalls (from Ref. 48).

Müñi(«Wg jlatióos f(W AWÍSS in; waHf quality in hatling witcn

Figure 21 Monitoring stations location for olive oil mill wastewater discharge through submarine outfalls (from Ref. 48).

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