Fish Waste Management: Treatment Methods Based on the Use of Microorganisms - Aquaculture Microbiology and Biotechnology - page 234

protein and phosphate concentration was up to 70.0%, 71.4% and 70.4%,
respectively, at 6.3 h hydraulic retention time (HRT) ( Fig. 9.6 ) (Lim et al . ,
2003).

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

0 50 100 150 200 250

Days

Ammonia 1 Nitrite Ammonia 2

Fig. 9.4 Inorganic nirtrogen (ammonia and nitrite), and ammonia concentrations after 210
and 60 d of treatment, respectively (Ammonia 1: treatment with three denitrifying strains of
bacteria; Ammonia 2: treatment with microbial mats) (Barak and van Rijn, 2000; Bender et
al . , 2004).

12

10

8

6

4

2

0

0 50 100 150 200 250

Days

Nitrate Phos phate Oxygen

Fig. 9.5 Nitrate and phosphate, and oxygen concentrations after 210 and 60 d of treatment,
respectively (Nitrate and phosphate: treatment with three denitrifying strains of bacteria;
Oxygen: treatment with microbial mats) (Barak and van Rijn, 2000; Bender et al . , 2004).