Common Causes and Solutions for Unclean Filter Cloth Cleaning

During the operation of the sewage treatment filter press, the filter cloth is constantly cleaned under high pressure. If the filter cloth is still not clean after high-pressure cleaning, you can check and solve it from the following aspects.

6 Common Causes and Solutions

Filter cloth is aged or damaged

The filter cloth has been used for too long, and the fibers are aged, worn, or clogged, which will lead to a poor cleaning effect.
Solution:
Check the wear of the filter cloth regularly. If the filter cloth is found to be hardened, damaged, or seriously clogged, replace it with a new one in time.
Choose a filter cloth material suitable for sewage treatment conditions to improve the filtering effect and service life.

Insufficient cleaning water pressure

The pressure of high-pressure cleaning water is insufficient to effectively wash away the dirt on the filter cloth.
Solution:
Check the working status of the high-pressure water pump to ensure that the pressure meets the design requirements (usually between 0.6 and 1.2 MPa).
Check whether the water pipes, valves, and nozzles are blocked or leaking, affecting the supply of water pressure.

Insufficient nozzle flow or nozzle blockage

Insufficient nozzle flow or blockage will lead to uneven cleaning, and the dirt on the filter cloth is difficult to completely remove.
Solution:
Check the cleaning nozzle regularly to ensure that the nozzle hole is not blocked by dirt or sediment.
If the nozzle flow is insufficient or damaged, the nozzle with appropriate flow should be replaced in time.
Use filtered water for high-pressure cleaning to reduce the risk of impurities clogging the nozzle.

Residual reagents and scaling

Due to the short mixing time of polymers, the reagents (such as flocculants, filter aids, etc.) have not been completely dissolved. When preparing polymers, the equipment concentration is too high or the amount of liquid added is too large. The reagents remain on the filter cloth, forming hard dirt, which affects the cleaning effect.
Solution:
Use special cleaning agents to chemically clean the filter cloth to remove residual reagents and scaling.
Adjust the dosing system to ensure that the dosage of reagents is reasonable and avoid residual problems caused by excessive dosing.
Increase the maintenance frequency of regular acid or alkaline washing of the filter cloth to maintain the permeability of the filter cloth.

Improper adjustment of operating parameters

The operating parameters of the filter press (such as pressure, filtration cycle, and cleaning cycle) are set unreasonably, resulting in excessive load on the filter cloth and difficulty in cleaning.
Solution:
Optimize the filtration pressure and time of the filter press to avoid overloading the filter cloth.
Shorten the cleaning interval, increase the cleaning frequency, and reduce dirt deposition.

Changes in sludge properties

The solid particle content, properties, or viscosity in the sewage changes, causing the filter cloth to be easily blocked.
Solution:
Adjust the pretreatment process to ensure a stable solid-liquid separation effect before the sewage enters the filter press.
Select the appropriate filter cloth type and dosing scheme according to different sludge properties.

Comprehensive Maintenance Recommendations

Perform a comprehensive inspection of the filter cloth and cleaning system regularly to ensure that all parts are functioning properly.

Develop a filter cloth maintenance plan, including physical cleaning, chemical cleaning, and regular replacement.

Train operators to ensure that the filter press is operated in accordance with specifications to improve the cleaning effect and service life of the filter cloth.

Common Causes and Solutions for Unclean Filter Cloth Cleaning