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The aerated biological filter backwash system is similar to the B-type filter in the water treatment system. It uses gas-water combined backwash. The purpose of the gas is to remove various particles and colloidal pollutants trapped during the operation of the aerated biological filter. Aging microbial film. The aerated biological filter air-water combined backwashing is realized through the filter plate and the water distribution long handle fixed on it. The backwashing process is generally performed according to the following steps: first reduce the water level in the filter and air-wash separately, and then use air -Water combined backwashing, and finally water washing alone. During the backwashing process, it is necessary to grasp the washing strength and washing time. It is necessary to flush the trapped material out of the filter and avoid excessive flushing of the filter material. The microbial membrane growing on the surface of the filter material will fall off and affect the treatment effect.
The recoil of the aerated biological filter can be completed by the running time, the resistance loss of the filter layer, and the water quality parameters. Generally, the on-line detection instrument feeds back the detection data to the PLC and is automatically controlled and operated by the PLC system.
The aerated biological filter water outlet system includes the use of peripheral books and the use of single-sided weir water. In large and medium-sized sewage treatment projects, for the convenience of process layout, a single-sided weir is usually used to produce more water, and the outlet of the weir is designed as a 60 ° slope to reduce the flow velocity of the water at the outlet. In order to collide the ceramsite that may be brought to the water outlet with the flow stabilization plate during backwashing, resulting in a decrease in the flow velocity and settling there, it slides back into the pool along the slope.
The aerated biological filter must not only complete the degradation of organic pollutants, but also the retention of various particles and colloidal pollutants in sewage and the aging and shedding of microbial membranes. At the same time, it must also complete the backwash of the filter itself. These modes run alternately. For small industrial wastewater treatment, the control of the filter can be simpler, and even manual control can be used; and during operation, switching between several groups of filters must be performed. If manual control is used, the workload is large and difficult. carry out. In order to improve the processing capacity of the filter and the effect of removing pollutants, a PLC control system must be provided to automatically control the operation of the filter, and the necessary automatic control system must be designed.