Biofloc systems are simple to build since they have minimal solids and chemical filtration. The solids (uneaten food and shrimp feces) grow algae, bacteria, protozoa, nematodes and zooplankton. To start and maintain the biofloc large amounts of molasses are often added to the system. The primary purpose of this aggregate floc is to act as the chemical filter for the system by converting toxic ammonia and nitrite to the less toxic nitrate. The secondary outcome of a well managed biofloc system is an increased growth rate due to the shrimp growing in a soup of food.
Biofloc systems might be easy to build but they are difficult to manage. If the biofloc is not managed correctly the entire floc can crash killing all the shrimp or start uncontrollably growing toxic bacteria, like Vibrio sp., which is deadly to the shrimp. Biofloc systems can also give an off flavor to the shrimp. The biggest problem with biofloc systems is they are not sustainable. Even the best managed biofloc will crash after a few batches of shrimp. When the biofloc is overloaded you have to filter the biofloc out of the water using filtration you avoided by using a biofloc based system, or you have tens of thousands of gallons of wastewater that need disposal.
Biofloc farms also require large plots of real estate as multiple tanks must be built to plan for system crashes. It is inevitable these crashes will occur, resulting in large amounts of wastewater. Disposal of the toxic water and the dead shrimp is very costly and labor intensive.
Purinator systems are a much more technologically advanced system. Where a biofilter takes ammonia and turns it into less toxic nitrate, the Purinator does much more. The Purinator does not just replace the biofilter; it enhances or replaces other parts of the filtration systems as well. The Purinator converts the ammonia to nitrogen gas so there is no buildup of nitrate in the system. The Purinator causes electrocoagulation which increases the effectiveness of the solids filtration. Purinator systems have much lower total suspended solids (TSS) than a system running a biofilter. The Purinator adds dissolved oxygen to the water where the bacteria in a biofilter remove dissolved oxygen from the water. The Purinator kills bacteria and viruses so there is no need to use ozone or Ultra Violet sterilization. The shrimp stay constantly healthier with the Purinator while there is NO chance of Vibrio sp. decimating the population.
The Purinator system is a 100% closed loop clear salt water system. The water can be indefinitely reused. The waste discharge line has another use, which is nurturing a large mangrove nursery. PureGrown practices “zero” water discharge. Every drop of water stays on site. Only the Purinator has the capability of creating a sustainable, pathogen free and cost effective large scale shrimp production operation.
The Purinator system requires much less real estate. The entire growout of the shrimp is indoors (larval to harvest size) and biosecure, the shrimp are much more active creating a great taste and texture. Don’t think we at PureGrown have gone far enough on creating true traceability? Well, we did. During the final growout stage we periodically sent shrimp to a 3rd party lab to test for specific bacteria specified by the USDA and FDA. We even specified other specific pathogens as well and every time the results were virtually undetectable. There is no other aquaculture shrimp facility that can compare to our protocol of traceability.
|Purinator Vs. Biofloc||Biofloc||Purinator|
|Clear, clean water|
|Water filled with bacteria and feces|
|Very low bacteria counts|
|Taste like shrimp should|
|Molasses added to the water|
|Pathogen free and biosecure|
|Muddy or off flavor|