Circulating Water Aquaculture Removal Technology – Aquatic Forum – China Animal Husbandry Website – A useful animal husbandry website
The total solid suspended material refers to particles having a diameter of more than 1 μm, including inorganic and organic. The organic part is an unstable suspended material, which causes oxygen consumption and organic decomposition, and the inorganic ingredients are easily deposited. The removal of solid suspended materials is one of the core links in the water treatment process of circulating water breeding system. Its removal effect directly determines the quality of the water quality and the stability of the system operation. With the sustainable development of domestic and foreign circulating aquaculture, the effective removal process of solid suspended matter is also increasingly attaching and developing.
Substation of solid suspension
Solid suspension in circulating water culture is mainly derived from feed, fishure and biological bacteria. The feed of feed determines the number of water solid suspensions, and the solid suspension produced by different characteristics of the solid suspension is also different in normal feeding state. In addition, circulating water often contains a large number of colonies, and the bacterial and falling biofilms freely in the water are also one of the important sources of solid suspensions in water. In a high-density breeding system, the suspension particles below 30 μm accounted high, accounting for 80% to 90% of the total mass of the particles in water, and the filtration process such as conventional precipitation and sieve filtration is difficult to completely removal.
Excessive suspension in the aquaculture will cause any impact of the suspension will cause the water to cloudy, increase the turbidity of the water body, and the organic suspension is not treated for a long time, which will deposit at the bottom of the fish pond, anaerobic Bacteria began to breed, deteriorated water quality, causing physical damage to fish, causing fish breathing difficulties, causing suffocation to death. At the same time, the turbidity of the water is high will affect the appetite of the fish, and the adaptability of fish shrimp is deteriorated.
Solid suspended matter removal process
mainly removes large particles of particle diameter of 100 μm, especially fishure and residual bait, to avoid increased process load after crushing in the system. The main process of pretreatment has precipitation and crude sieve filtration, and the application of its particle removal rate is low in circulating water culture system due to particle removal rate of 100 μm.
Crude filtration This purpose is to utilize a conventional medium filtration process to remove solid suspended particles of less than 30 to 100 μm, and the common equipment includes a microfilter filter, a particulate filter, and the like. The drum type microfilter is the most widely used crude filter device, which has the advantages of strong practicality, low energy consumption, less land, convenient maintenance. Its treatment effect and hydraulic load rate, mesh pore size, particle content, and strongThe parameters such as degrees are closely related, the smaller the pore size, the higher the solid matter content, the lower the hydraulic load rate. Fine filtration
precipitation is mainly used to remove micro-suspended particles and some soluble organic substances below 30 μm, and the main means of foam separation. The foam separation is a purification process suitable for effective removal of micro-suspended particles, soluble organic substances, and reduced the number of hydrassic bacteria in water, and has a certain oxygenation and de-carbon dioxide function.
This article is from: Guangzhou China Airlines Environmental Protection Technology Co., Ltd.
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