Due to the large volume of aquaculture wastewater and the high content of suspended solids, the triangular water-cutting wedge screen adopted by the inclined screen solid-liquid separator can separate and squeeze out most of the suspended solids. The suspended solids in the separated wastewater are reduced, which greatly lowers the investment and operating costs of the subsequent wastewater treatment equipment.

Ii. Working Principle

The wastewater to be treated is evenly distributed on the inclined screen surface through the overflow weir. It undergoes primary filtration through the inclined screen surface. The surface gap of the screen is small and smooth, while the gap on the back is large, so the drainage is smooth. Solid substances are retained. The filtered water flows out from the gaps of the screen plate. Under the action of water pressure, the solid substances are pushed to the lower end of the screen plate and enter the screw conveyor sleeve filter screen for secondary filtration. Then, the screw conveyor pushes the solid matter into the circular filter screen of the screen tube for three-stage filtration. Finally, the screw conveyor pressurizes the solid matter to push it away from the material blocking device, thus achieving the purpose of solid-liquid separation.

Iii. Equipment Features

1. The volume of the old biogas digester originally built by the livestock farmers is too small, and the retention time of the sewage in the digester is too short, resulting in an excessively high concentration of sewage discharge. If the sewage is treated with a inclined screen solid-liquid separator before being submerged in the digester. It can effectively reduce the content of COD and BOD in sewage, alleviate the operational load of biogas digesters, and thereby achieve the goal of reducing sewage discharge.

2. The wastewater separated by the inclined screen solid-liquid separator is intermittently fed into the biogas digester, which can provide the anaerobic tank with sufficient digestion time, allowing the active bacteria in the tank to reproduce more vigorously and increase the gas production.

3. The wastewater separated by the inclined screen solid-liquid separator enters the biogas digester, which can effectively solve the problem of crust formation in the biogas digester and eliminate the need to clean the biogas residue.

4. The use of solid-liquid separators for livestock and poultry manure can reduce the investment in the construction of biogas digesters.

Hydraulic Screen Model and Parameter Table

Note: Based on the user's water quality and quantity, as well as on-site conditions, flexible adjustment designs will be made for operation, water outlet direction, size, and floor space, etc.

Note: When customers are selecting a model, the processing capacity of the hydraulic grille should take into account the following aspects: the type of sewage; Temperature; Density; Oil content; Traffic, etc.