Organic Waste Recycling

Aquatic weeds and their utilization 363

Total phosphorus 0.45 0.89 0.85 - -

Nutrient content of plants, dry weight, (%) Total Kjedahl nitrogen 2.73 3.56 3.75 - -

Hyacinth cover (%) 100 100 100 100 100

Organic loading rate (kg/ha-day) 26 44 179 31 43

Hydraulic residence time (days) 54 ~ 67

a

6.8 22 5.3

Hydraulic loading rate, (m

3 /ha-day)

240 260

a

3,570 700 1,860

Depth of hyacinth ponds (m) 1.22 1.73 1.83 1.5 1.0

Surface area of hyacinth ponds (ha) 2 3.6 0.28 0.07 0.06

Types of pre-treatment None None Facultative lagoons One aerated and one facultative lagoon Plant A: aeration basin, clarifier, three lagoons in series

Table 7.9 Summary of design and performance characteriLocation National Space Technology Lab: Lucedale, Miss Orange Grove, Miss. Ceder Lake, Miss (Duckweed) Williamson Creek, Tex.: Phase I

stics of aquatic weed wastewater treatment systems