Monday, 13 July 2009

National Center for Mariculture - Practical Training Vol. 4

Summer is here. Temperatures rounding from +38 to +45... Just too much...

These conditions, of course, effect the animals too. Rising temperatures causes better habitats for bacterias and parasites to grow and get strong specialy in standing water locations. In this case - Fish tanks.

(Figure 1 - Denitrification Reactor's system) During june we have been fighting the famous Mycobacterium which similar to human's Tuberculosis together with some other parasites as Benedenia and cryptocarium. Some have easier treatments while some have non.

While not able to work with groupers, i have been focusing more at the growth of gilt-head Bream in the Denitrification system. A project which supported by the USAID (U.S. Agency for International Development) and providing a cooperation between Israeli NCM (National Center for Mariculture) in Eilat and Jordanian MSS (Marine Science Station) in Aqaba.

The work at the denitrification system currently been about the oxygen levels inside the reactor. Instead of oxygen level between 0% to 1% there are around 20-30% and most efforts are to locate where and how this oxygen penetrate inside.

(Figure 2- Large scale denitrification reactor pilot's project)

Another problems found out in the system is problematic blocks in the pipes caused by the sludge flowing from the reactor to the solid settler.

After come to decision that in order to make the sludge more active, a removal of some older less active might be a good solution. This will make the sludge younger and hopefully more active and by that more effective in consuming oxygen.
Measurements as OUR (Oxigen Uptake Rate) and NUR (Nitrogen Uptake Rate) helped to confirm the different assumptions.

During the last month i have been experiencing some laboratory work, getting more confident doing that which is why i am here.

Have a safe, relaxed summer and dont forget to put sunscreen when you go out!

Yoav Magen, Environmental Engineering Degree Program.

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