Domestic Wastewater Treatment Systems
AST bead filters are particularly well suited to the treatment of domestic wastewater flows that are characterized by moderate concentrations of suspended solids (TSS<300 mg/L) andBOD5 concentrations (BOD5<300 mg/L). With minimal protection provided by a bar screen and perhaps a grit chamber, the units can be placed anywhere in the treatment train to accomplish either a solids removal or biological filtration.
Meet Tough Effluent Standards
Bead filters can be used to complement a primary clarifier reducing TSS and CBOD5 for direct discharge in the face of stringent effluent standards. They must be configured in a recirculating format to supply oxygen, and flows must be decreased to assure proper contact times, but an RCPG unit is capable of accomplishing almost complete treatment (disinfection will be required) in a single step. This effectively collapses the secondary biological treatment, secondary clarifier, and potentially tertiary polishing into one unit. In these applications the primary clarifier usually serves a dual purpose, storing sludge generated by both the clarifier and bioclarifier functions. This is an approach that is attractive for small flows that must be treated remotely.
Bead filters can be also employed to upgrade an existing plant most commonly for the polishing of suspended solids, CBOD5, or ammonia as a tertiary polisher for a mechanical plant, wetland, or lagoon system. Fixed film operation of the unit provides additional stability to the cold water nitrification capabilities of a suspended growth system. Effluents of wetlands, normally low in BOD, can be protected from the discharge of autonomously produced particulate organics that can lead to violations of suspended solids criteria. Treatment of lagoon effluents with bead filters can dramatically improve effluent quality although this goal is frequently challenged by ever-changing algal populations. Whether a lagoon is dominated by heterotrophs or phototrophs a RCPG unit will always provide nitrification when needed.
Equipment & Technology
Recirculating PolyGeyser
Focus on Biofiltration
High solids loading & superior bioclarification with minimal water loss.
Learn MoreLow Profile PolyGeyser
Focus on Energy Savings
Gravity or airlift fed for maximum energy conservation.
Learn MoreHigh Profile PolyGeyser
Aggressive Solids Control
High solids loading & superior bioclarification with minimal water loss.
Learn MorePropeller Bead Filter
Perfect for High Load, High Flow Applications
Motorized filter designed for high flow and highly loaded systems.
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See Our Recent Case Study
Pilot RCPG System for Facultative Lagoon Polishing
In order to meet increasingly strict discharge standards, AST provided a trailer mounted pilot scale test unit to pull a side stream off of the current waste stream.