Pretreatment Alternatives

Pretreatment is a series of physical and chemical processes to precondition the wastewater and remove some wastes. The treatment is usually arranged in the following sequence: screening; flow equalization and neutralization; optional fat, oil, and grease (FOG) separator; optional acidification;

TABLE 30.2

Characteristics of Soft Drink Wastewater

TABLE 30.2

Characteristics of Soft Drink Wastewater

Parameter

Concentration (mg/L)

COD

1200-1800

bod5

600-4500

Alkalinity

1000-3500

TSS

0-60

VSS

0-50

nh3-n

150-300

PO4-P

20-40

SO4

7-20

K

20-70

Fe

10-20

Na

1500-2500

Ni

1.2-2.5

Mo

3-8

Zn

1-5

Co

3-8

Source: Chen, J.P., Seng, S.S., and Hung, Y.T., Soft Drink Waste Treatment, Handbook of Industrial and Hazardous Waste Treatment, 2nd ed., Marcel Dekker, New York, 2004, pp. 1077-1091.

Source: Chen, J.P., Seng, S.S., and Hung, Y.T., Soft Drink Waste Treatment, Handbook of Industrial and Hazardous Waste Treatment, 2nd ed., Marcel Dekker, New York, 2004, pp. 1077-1091.

Bakery wastewater

Bakery wastewater

FIGURE 30.2 Bakery wastewater pretreatment system.

coagulation-sedimentation; and dissolved air flotation (DAF). The pretreatment of bakery waste-water is given in Figure 30.2.

Due to the high content of SS and FOG, pretreatment is always necessary for the food industry. It can decrease contaminant loading for subsequent biological and/or chemical treatment processes as well as protect process equipment. In addition, pretreatment is economical in the total process view as it is not as expensive as biological and chemical treatment.

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