PPH Backwash Tank

PPH backwash tanks are corrosion-resistant buffer tanks made primarily of PPH (polypropylene) and specifically designed for backwashing or reverse-flushing processes. They are commonly used in the online cleaning stages of ceramic or silicon carbide membrane filters, ion exchangers, activated carbon filters, or sand filters. They must withstand short-term pulsating pressure, high salt content, and alternating acid and alkali conditions, while ensuring extremely low metal leaching.

Working Principle

The working principle of a PPH backwash tank is to utilize a stored fluid medium, which, when needed, backwashes connected equipment or pipelines at a certain pressure and flow rate through a specific piping and valve system. For example, in a water treatment system, when the filter media is clogged with impurities, clean water from the backwash tank flows back into the filter, washing away the impurities and restoring its filtration performance.

Structural Components

PPH Tank Body: The main container, with diameter and height customized according to the water volume being treated.
Internal Water Distribution System:
Upper Water Distributor: Ensures even distribution of incoming water across the filter media surface, preventing water flow from deviating from the filter bed.
Bottom water collection or distribution system (most critical): Typically composed of filter caps (mushroom heads) or slotted filter plates. Its functions are:
During filtration: To evenly collect the filtered water.

During backwashing: To evenly distribute the backwash water flow, avoiding dead zones and ensuring all filter media are thoroughly rinsed.
Filter media layer: Filled according to the filtration target, such as quartz sand (turbidity removal), activated carbon (color removal, odor removal, organic matter removal), manganese sand (iron and manganese removal), resin (softening), etc.
Multi-way control valve/valve assembly: The system can automatically or manually control the switching between various operating states such as filtration, backwashing, forward washing, and standby.
Inlet and outlet piping and instruments: Including pressure gauges (monitoring the pressure difference between inlet and outlet water to determine if backwashing is needed), sampling valves, etc.

Application areas

Industrial water treatment

Boiler feedwater pretreatment, circulating cooling water bypass filtration, chemical process water filtration.

Drinking water treatment

Pre-filtration for rural water supply and residential drinking water systems.

Wastewater treatment

Deep filtration treatment for greywater reuse.

Swimming pool water circulation

Serves as the primary filtration unit.

Seawater desalination pretreatment

Removes suspended solids and colloids from seawater.

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