This is a choice made by both parties
The primary criterion for judgment
If the requirement for the moisture content of the filter cake is not high (such as sludge after conventional sewage treatment, low value-added slag), and there is no need for further drying or low transportation pressure in the future, choosebox filter pressJust enough. The moisture content of its filter cake is usually between 25% and 40%, which can meet the basic needs of "capacity reduction" without the need for additional investment in the pressing system cost.
If high dryness of the filter cake is required (such as high concentration chemical sludge, mining tailings, high value-added food/pharmaceutical materials), the moisture content needs to be reduced to 15% -30% to reduce transportation costs, avoid secondary pollution, or meet the standards for subsequent resource utilization (such as incineration, landfill), it must be selectedDiaphragm filter pressIts unique "secondary pressing" function is the core advantage in reducing moisture content, which cannot be replaced by box filter presses.
The concentration and viscosity of different materials directly affect the adaptability of equipment:
processLow concentration and low viscosity materials(such as municipal sewage, coal washing wastewater, and ordinary chemical filtrate), choosebox filter pressMore suitable. This type of material can be separated without high-intensity pressing, and the simple box structure can operate stably without increasing maintenance costs due to material blockage.
processHigh concentration and high viscosity materials(such as petrochemical waste residue, lithium battery positive electrode material slurry, rare metal refining slag), must be selectedDiaphragm filter pressIt can withstand a maximum pressing pressure of 4.5 MPa, break through the filtration bottleneck of high viscosity materials, and avoid the problems of slow filtration speed and poor cake formation in box type filter presses.
The cost difference between the two types of equipment is concentrated in "pre procurement" and "post maintenance", and needs to be judged based on the enterprise budget cycle:
ifLimited initial budgetAnd with a small production scale and low daily processing capacity (such as small sewage treatment plants and township enterprises), choosebox filter pressThe equipment price is 30% -40% lower than the same processing capacity diaphragm model, and there are no vulnerable parts such as diaphragms or pressing systems. Daily maintenance only requires replacing the filter cloth, and the annual maintenance cost is about one-third of the diaphragm model.
ifLong term operating costs are more importantAnd with a large processing capacity (such as large mines and chemical industrial parks), it is recommended to chooseDiaphragm filter pressAlthough the equipment cost is high in the early stage, the low moisture content of the filter cake can reduce the subsequent transportation and drying costs (as shown by data from a certain sewage treatment plant, the comprehensive ton cost of membrane type sludge treatment is 15% -20% lower than that of box type), making it more cost-effective in the long run.
The degree of automation and continuity requirements in production scenarios determine the adaptability of equipment operation
If the production scale is small and manual auxiliary operations are acceptable (such as manually opening and closing filter plates, manual unloading), choosebox filter pressIt has a simple structure, does not require complex control systems, and is suitable for intermittent production. Manual intervention can meet the needs.
if neededLarge scale continuous productionOr pursue automation and downsizing (such as large-scale factory assembly lines, unmanned workshops), chooseDiaphragm filter pressIt comes with an automated control system that can accurately adjust the pressing pressure and time. Some models also support online detection of moisture content, which can be linked with the production line to reduce labor costs. Although the single cycle is 15% -20% longer than the box type, the effective volume of the filter chamber is large, and the actual daily processing capacity is 30% higher than that of the box type.
Low cost, low requirements, and processing of dilute materials - selective box filter press;
High dryness, high viscosity, large-scale production "- choose diaphragm filter press.