The acrylic fish tank life support system is composed of six major parts. The following is the process principle of each part of the life support system.
1. Gravity Filter Pool
That is, the open gravity sand filter device, it is the earliest (about 260 years ago) used in the history of breeding, a filter device that was used in the London Zoo Aquarium in 1853. Because of its many advantages, it is still used by many aquariums. Its biggest advantage is that it can provide a large-capacity buffer space while maintaining the stability of the breeding water. The gravity sand filter uses fine sand, whetstone, gravel, etc. as the filter material, which can filter the remaining bait, excrement, secretions, and suspended particles in the water on the surface of the filter material. It can be removed and maintained during backwashing. The water is clear. The more important role is that the filter material of the gravity sand filter has a large surface area to adapt to the growth and reproduction of nitrifying bacteria and nitrosating bacteria. The filtration pressure of the gravity sand filter is generally about 0.1～0.2Kg/cm2, and the filtration speed is 4～6m/h.
2. Cold-hear Exchanger
Stable water temperature is a prerequisite for the survival of aquatic organisms, and a cold heat exchanger is the main device for temperature control of large water bodies. There are mainly multi-tube heat exchangers and multi-plate heat exchangers, and the latter is considered to be the most ideal exchanger for the aquarium. Dalian Polar Museum uses this kind of exchanger, and the usage is very good. The cold source of the exchanger is provided by the refrigeration unit, and the heat source is provided by the coal-fired or oil-fired boiler.
3. Pressure Filter
That is, closed pressure rapid filtering device (both vertical and horizontal). It is characterized by fast filtration speed (generally 10-40m/h, maximum pressure is generally 2.5Kg/cm2), small footprint, space saving, and can enable semi-automatic and automated management of the aquarium. The disadvantage of the pressure filter is that the filtration effect is poor compared to the gravity sand filter, and the design must pay attention to solve the problem of insufficient dissolved oxygen.
4. Trickle Filter
The trickle filter is a relatively new aquarium water treatment technology concept. The filter material is a multi-negative or multi-column biochemical ball and porous ceramic block made of plastic. It has a very large surface area. The filter material is bare or semi Immersed in water, so oxygen supply is not a problem. The filtering speed of the trickle filter is slow. When the feeding water is poured into the filter, the water flows through the surface of the biochemical ball, which continuously provides abundant nutrients for the nitrifying bacteria under the surface. The nitrifying bacteria are very active. Nitrification activities are also very strong. Not only that, the biggest advantage of the trickle filter is that once the power stops running and the water flow stops, the nitrifying bacteria can still survive for 2 to 3 days because the biochemical ball is exposed to the air, and the filter material of the trickle filter does not need to be cleaned.
5. Ozone Treatment
Ozone has a very strong oxidizing ability. Using ozone to treat water can kill 100% of floating microorganisms (pathogens, algae) in the water and deodorize. Ozone treatment has been widely used in sewage treatment, drinking water treatment and aquaculture water treatment. In the past two years, domestic aquariums have also begun to use ozone to treat their breeding water. Especially in the water treatment of large water bodies, ozone has unparalleled advantages of other sterilization methods. It has extremely strong sterilization power, fast speed, large amount of treated water, and can be decomposed into oxygen to supplement dissolved oxygen in water without secondary pollution. Ozone can be generated in situ in the application, and it is convenient, reliable and economical to use.
6. protein skimmer (Protein Skimmer)
The protein separator, also known as the foam separator, uses the tension of the bubble surface to adhere the particulate suspension in water and the protein dissolved in the water for concentration and separation. This foam separation method has been widely used in wastewater treatment, ore purification, microorganism concentration and protein extraction. The protein separator can be used in the aquarium to remove soluble organic matter in the water, reduce the production of ammonia, and reduce the biochemical oxygen consumption in the water. The protein separator and ozone treatment work best together.