3.1.4. Evaluation of BIO-BLOK® 150

3.1.4. Evaluation of BIO-BLOK® 150

The result of the 4 tests comparing the BIO-BLOK® 150 with the Bionet 200 (Germany) as filter medium has given occasion for the following conclusion:

Specific growth rate and gross feed conversion ratio

Using BIO-BLOK® 150 HD as filter medium, the result is a significantly higher growth rate (SGR) and a lower gross feed conversion ration (FCR).

Test no. 1 (start)

 

SGR

FCR

BIO-BLOK® 150

0.46%

2.06

Bionet 200

0.34%

4.29



Test no. 3 (maximum load)

 

SGR

FCR

BIO-BLOK® 150

1.45%

1.45

Bionet 200

1.28%

1.67



Decomposition of ammonia:     NH4+-N converted per stated m2 per day

Test no. 2 (normal load)

BIO-BLOK® 150

0.20 gm NH4+-N per m2

Bionet 200

0.15 gm NH4+-N per m2



Test no. 3 (maximum load)

BIO-BLOK® 150

0.447 gm NH4+-N per m2

Bionet 200

0.386 gm NH4+-N per m2



Speed of starting and operation
BIO-BLOK® 150 has proven to be quicker with regard to starting of the nitrification processes (test No. 1) and with regard to keeping lower NH4+ and NO2- values at normal load as well as at increasing load.

Operating economy
With regard to commercial aquaculture, the most important result of this comparative test was the better specific growth rate (SGR) and lower gross feed conversion ration (FCR) in the system with BIO-BLOK® 150 as filter medium in test No. 3 with maximum load on the biofilters.