Organic Waste Recycling

Fish, chitin, and chitosan production 291

Figure 6.15 Some arrangements of waste-fed ponds

Example 6.1

Design a septage-fed fish pond from the given septage characteristics.

Quantity 10 m^3 /day

BOD 5 5,000 mg/L

COD 25,000 mg/L

Org-N 1,500 mg/L

NH 3 -N 500 mg/L

Total-P 300 mg/L

Total solids 4.5%

Volatile solids 70% of total solids

Biogas slurry

or sludge

(Option)

Depuration

Human

Fish feed or

livestock feed

Fish

Maturation fish

pond

Facultative fish

pond

Facultative

pond

Fish pond

Septage or

nightsoil

Sewage Composted

product

Fish pond

Fish

Human