Custom Water Bladder: Things You May Want to Know

The filtering drum in the recirculating aquaculture system is an important water treatment equipment, and its main function is to remove suspended solids in the water, including feed residues, fish feces, and biological bacterial masses. There are two main types of filtering drums: drum type and crawler type.Drum filtering drum:Filtration is performed using a rotating stainless steel drum with a dense 316L stainless steel screen attached to it, which is driven by a motor through gears.Crawler type filtering drum:By controlling the mesh size of the filter cloth, suspended particles with a diameter larger than the corresponding specification can be effectively removed from the water. By filtering on one side, with a built-in backwash device, and then by designing multiple sewage tanks and sewage outlets, secondary pollution can be effectively avoided.After years of practice, rotary drum filtering drum has gradually become the mainstream of factory-scale recirculating aquaculture due to its compact structure, small footprint, good filtration effect, low operating cost and easy maintenance.The structure and working principle of rotary drum filtering drumThe rotary drum filtering drum uses a rotating drum to filter. The outside of the drum is covered with a dense mesh and driven by a motor. A pump is installed outside the filtering drum. The filtered clean water is pumped away by the pump, while the dirt is left on the mesh and washed away by back washing.1. The basic structure of the rotary drum filtering drumThe drum filtering drum is mainly composed of a horizontal drum, a filter screen, a driving device, a water inlet system, a water outlet system, a sewage system, a backwash system, and a control cabinet.1. Roller:This is the core component of the rotary drum filtering drum. It is generally a horizontally placed cylindrical structure consisting of a metal frame with a supporting mesh and a working mesh woven from stainless steel wire wrapped around the outside. The mesh size is usually between 60-250 meshes. Different mesh specifications can be selected according to actual needs to achieve the corresponding filtering accuracy.2. Driving device:It is composed of a motor and gears. The motor drives the drum to rotate through the gears. The general speed is 1-3r/min. Too fast a speed may cause large particles to break into tiny particles and pass through the filter, reducing the filtering effect.3. Water inlet system:It includes water inlet pipe and overflow weir water distributor, etc. The water inlet pipe introduces the aquaculture wastewater to be filtered into the filtering drum machine. After the wastewater enters the overflow weir water distributor, it can be evenly distributed on the filter cartridge filter screen rotating in the opposite direction after a short period of steady flow, so as to achieve better filtering effect.4. Water outlet system:It is mainly the water outlet pipe. The clean water filtered by the filter is discharged from the filtering drum machine through the water outlet pipe and enters the next water treatment link.5. Sewage system:It consists of a sewage collection tank and a sewage discharge pipe. The solid dirt intercepted by the filter screen will be collected in the sewage collection tank during the rotation of the drum, and then discharged from the filtering drum through the sewage discharge pipe.6. Backwash system:It consists of a back washing water pump, a back washing pressure nozzle, a liquid level sensor, a back washing pipe, etc. When the filter is clogged to a certain extent, the water level controller senses the water level change, starts the back washing water pump, and high-pressure water rushes to the filter through the nozzle, flushing the dirt attached to the filter into the sewage collection tank, thereby realizing automatic cleaning of the filter and ensuring the filtering effect.7. Control chassis:The control box is the brain of the filtering drum machine. The traditional control box can only perform localized control, and the parameter settings are complicated and inconvenient to operate. When the equipment fails, there is no telephone remote alarm system, which increases the risk of breeding. With the rapid development of the Internet of Things and sensor technology, intelligent filtering drum machines have appeared on the market. For example, the intelligent filtering drum machine launched by wolize can not only monitor the operation of the filtering drum machine in real time through a mobile phone, but also detect faults such as filter blockage, filter damage or back washing abnormalities in time through the use of a variety of sensors. After the fault is discovered, the relevant personnel can be informed by telephone alarm, which greatly reduces the failure rate of the filtering drum machine and reduces the risk of breeding.2. Working principle of rotary drum filtering drum: The working principle of the filtering drum mainly consists of two parts: filtration and back washing:1. Filter:The sewage enters the equipment through the feed port of the filtering drum and passes through the microporous surface of the filter. The commonly used micropore size is usually around 200 meshes, which can effectively intercept suspended solid particles and colloidal particles.2. Anti-cleaning:As the filtration time increases, the surface of the microporous filter membrane will gradually be blocked by solid particles and colloidal particles, reducing the filtration efficiency. In order to maintain the normal operation of the filtering drum machine, the microporous filter membrane needs to be cleaned, and the cleaning process is usually carried out by back washing. 

Canvas fish pond is a common fish keeping container made of canvas material. It is usually designed in a round, square or rectangular shape and can be chosen in different sizes and depths according to the needs. The material and shape of the canvas fish pond have an important impact on water quality and fish life. The following will introduce in detail the influence of the material and shape of the canvas fish pond on the water quality and fish life.1. The influence of the material of canvas fish pond on water quality and fish lifeAir permeability of canvas material: The material of the canvas fish pond should have good air permeability, because fish need sufficient oxygen to maintain life activities. If the material of the canvas fish pond is airtight, oxygen cannot enter the water through the material, which will reduce the dissolved oxygen content in the water body, affect the normal breathing of fish, and even cause fish to suffocate.Weather resistance of canvas material: Canvas fish ponds are usually placed outdoors and need to withstand the test of various climatic conditions. The canvas material should have good weather resistance and be able to resist the influence of natural environments such as sunlight, rain, wind and snow. If the canvas material has poor weather resistance and is easily damaged or aged, it will cause problems such as water leakage and cracking in the fish pond, which will affect the stability of water quality and the living environment of fish.Anti-corrosion property of canvas material: The material of canvas fish pond should have certain anti-corrosion property, in order to prevent the problem that plastic materials are easy to bring harmful substances to the pool water. If the material of the canvas fish pond is not corrosion-resistant, it may release toxic substances, which will adversely affect the health of fish.2. The impact of the shape of the canvas fish pond on water quality and fish lifeDepth of fish pond: Fish have certain requirements for water depth, so the depth design of canvas fish pond should be reasonable. If the fish pond is too shallow, it is not conducive to the growth and movement of fish, and it will also cause fluctuations in the temperature and oxygen content of the water body. And if the fish pond is too deep, it is easy to cause the oxygen above the water body to be unable to fully dissolve into the water, which will affect the breathing of bottom fish.The shape of the fish pond: the shape of the canvas fish pond can be round, square or rectangular. Different shapes of fish pond designs will have a certain impact on water quality and fish life. The design of the circular fish pond is more reasonable, which is conducive to the circulation of water flow and the swimming of fish. When designing a square or rectangular fish pond, it is necessary to consider the fluidity of the water flow, avoid dead ends and siltation, so as not to affect the water quality and fish life.The capacity of the fish pond: The capacity of the canvas fish pond will also have a certain impact on the water quality and fish life. Fish ponds with small capacity are easily affected by violent fluctuations in water temperature and water quality, and are not suitable for long-term fish breeding. A fish pond with a larger capacity can provide a more stable water quality environment, which is conducive to the growth and reproduction of fish.

Water is the environment for fish to survive. Better water quality can reduce the occurrence of fish diseases and is more conducive to the growth and survival of fish. In actual production, water quality can often be judged by changes in water body color, ammonia nitrogen content, and sediment color. 1. The red water color of the red water pond is mainly caused by diatoms or golden algae becoming the dominant species. Usually, there is no serious problem, but once the weather suddenly changes and causes a large number of algae to die, toxins will be produced and the water body will deteriorate, and even directly cause Fish poisoned and died. Therefore, once the pool water turns red, it must be improved in time. When the weather is fine, first use Siji'an or quaternary ammonium salt iodine, etc. to spray and disinfect, and then spray with hydrogen peroxide, strong chlorine essence, etc. on the second day, and then top dress the fertilizer once after 3 days depending on the situation.2. Black water When the pool water is black, it indicates that more organic matter in the pool has not been transformed in time, such as residual bait, animal remains, excrement, and humus at the bottom of the pool. Hydrogen, ammonia nitrogen, nitrite and other harmful substances endanger the health of aquatic animals, reduce their immunity, lead to the infection of pathogenic microorganisms, and even cause fish flooding in ponds. Once this kind of black water is found, apply chlorine-containing drugs such as dioxychloride once on the first day to the second day to oxidize too much organic matter. After 3 days, use Baifeng Vitality Water Purification Wang Quanchi to splash once.3. White turbid water When the pool water is white and turbid, it indicates that there are too many organic oxygen-consuming substances in the pond. Relatively speaking, there are few microorganisms that decompose large-scale organic matter into nutrient salts. The material circulation in the pond is destroyed, the water in the pond is close to aging, and there is a severe lack of oxygen. The fish in this kind of pond are generally prone to floating heads from early morning to dawn before the sun rises. When the pool water is found to be cloudy, apply "Shui bao Oxygen Pack" on the first day to oxidize the organic matter in time after flocculation. On the second day, apply Bai feng Aquatic Bao once to the whole pool to increase the active microorganisms in the pool and promote water body circulation.4. Water with high ammonia nitrogen content is fed with high-protein feed, chilled meat, or intensive fish ponds that feed on live fish, such as crab ponds, prawn ponds, snake head ponds, and mandarin fish ponds. After adding high-protein bait, the content of ammonia nitrogen in the metabolic products is too high, which will affect the feeding and growth of aquatic animals, reduce their immunity, and easily cause parasite or pathogenic microorganism infection. Therefore, for intensive ponds that feed on high-protein feed, chilled meat or live fish, apply ammonia or bottom net once every 10 to 15 days to degrade ammonia nitrogen in time. If through the water quality test, if the ammonia nitrogen content in the pool water is found to be seriously exceeding the standard, you should apply ammonia net and oxygen treasure to the pool in time, and then use fertilizer water element and fertilizer water treasure once on the third day to increase the active microorganisms in the pool and promote plank tonic The reproduction and growth of organisms enhance the material circulation capacity of the water body.5. Due to the deposition of humus in the pool water, animal residues, bait, and feces sink to the bottom of the pool and then decompose, causing the bottom mud of the pond to turn black and stinky, which easily produces harmful substances such as methane, hydrogen sulfide, and nitrite. It is very easy to pose a threat to aquatic animals living in the middle and lower layers, such as crucian carp, grass carp, herring, crab, shrimp, mandarin fish and other species. When the situation is serious, the aquatic animals in the middle and lower layers of the pond often float in the middle and upper layers, and do not want to go to the normal living water layer. If the above situation occurs, apply Baifeng Aquatic Po every 10 days to 15 days to increase beneficial microorganisms, accelerate the transformation of organic matter or humus that sinks to the bottom of the pool, and avoid blackening and odor of the bottom mud and the production of methane, Harmful substances such as hydrogen sulfide and nitrite. If you find that the bottom mud in the pond is black and the water is stinky, you should immediately take measures to change the water. After changing the water, apply Vitality Clean Water King on the first day, and quick-acting fertilizer Shuibao on the second day to adjust the water quality.

It is undeniable that compared with traditional aquaculture technology, circulating water technology requires a large amount of fixed investment in the early stage, such as civil engineering costs and various research and development inputs for aquaculture modules. Also face high operating costs for feed and fry. Therefore, in terms of investment in circulating water technology projects, we hope to find an agricultural technology service company that adopts the EPCO asset-light operation model, which can reduce the cost structure of circulating water farming or approach it to the cost structure of traditional farming.Specifically,  believe that a good RAS aquaculture enterprise should have the following advantages:First of all, behind the enterprise, there needs to be a complete set of data center to support the continuous data accumulation in the production process, and to get rid of the traditional breeding mode of relying on the empiricism of the master. Use data to train technicians in batches, so that the breeding process can be standardized and professional. Secondly, the enterprise needs to have more experienced aquatic researchers to do a good job in the breeding environment of the cultured species, and to be able to accurately control the hatching rate, survival rate, bait ratio and other factors. Finally, the team also needs to have a self-developed feed formula or an external feed company that can bring stable feed supply and nutrient intake to the species being farmed, and can make the aquatic products produced healthy and strong while reducing costs.It is not a simple matter to use the new technology of RAS circulating water to subvert the traditional breeding mode in the past. The production process has spawned a large number of service requirements for technical support, facility support, and raw material support. Therefore, we hope to find a team with knowledge reserves spanning engineering, marine biology, animal nutrition, microbiology and other disciplines, and the management team can have both the ability to integrate industry resources and the ability to implement projects.

Since a lot of residual bait and excrement will be produced during the breeding process, a large amount of them will be deposited on the bottom of the pond and fermented and decomposed, often producing harmful gases such as hydrogen sulfide and ammonia ammonia, resulting in deterioration of water quality, which not only seriously affects the growth of fish species, but also causes The occurrence of diseases, especially in the summer when the temperature is higher, the speed of water quality deterioration is very fast, so it is necessary to add new water frequently to improve the water quality.As the fish body continues to grow, the number of water changes should be flexibly controlled according to the specific conditions of water quality changes. It is necessary to do a good job in daily disease prevention work, and take corresponding measures in time according to the observation results of the pond patrol. In addition to using quicklime and other drugs to clean the pond thoroughly, attention should also be paid to cleaning the food field regularly, and disinfection should be carried out during fish disease epidemic seasons.