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BROCHURES

Oldcastle Precast® Decentralized Wastewater System
Featuring patented Algaewheel® technology

DESCRIPTION OF SYSTEM PACKAGES

 

Oldcastle Precast® provides Green solutions for decentralized and on-site wastewater treatment applications, whether package-plant style or for use with subsurface discharge technologies. Typical clients consist of commercial, educational, institutional, and industrial facilities, as well as cluster-housing and subdivisions. BACPAC® SYSTEMS with SUBSURFACE DISCHARGE Our Bacpac modules are the key component in achieving target effluent treatment goals. The Bacpac is pre-engineered and pre-manufactured which allows greater flexibility in the overall system layout and a faster installation than field-constructed systems. Typical bacpac wastewater treatment systems include the following components: • Collection System The collection system will be designed to meet the specific site conditions and may include a low pressure grinder pump system or gravity sewer system. • Primary Treatment & Flow Equalization Tank This initial component of our system allows pretreatment and flow equalization in one compartment. The equalized flow reduces hydraulic surges ahead of the bacpac treatment modules and tertiary settling tanks by storing influent wastewater and metering flow in timed doses. • Bacpac® Modules The bacpac incorporates features of the best known bacteriological treatment methods while eliminating the operation and maintenance issues associated with them. Our unit functions as a rotating biological contactor, aerobic treatment unit, and fixed media filter in a single pass vessel. In addition to the bacteria colonies, our module promotes algae growth and takes advantage of the symbiotic relationship between bacteria and algae similar to a natural and diverse ecological filtration process. The bacpac was designed to fit directly on top of the settling tank and requires no additional land space. The number of bacpac modules required to achieve effluent treatment goals is dependent on waste strength. WE have developed sizing criteria based on performance data collected over the previous ten year. • Low-Energy Blower System The regenerative blower system provides air to aid in moving water through the system, rotate the wheels, and provide dissolved air floatation. A single, small low-energy regenerative air blower blows air into each bacpac unit. • Settling Tank Effluent water from the bacpac unit is discharged into the settling tank where the solids settle for anaerobic digestion. The algae produce a natural polymer which facilitates solids settling. Effluent from the settling tanks can then be discharged to the chosen disposal technology. • Soil Absorption Disposal Technology Treated effluent can typically be disposed of through a subsurface disposal technology appropriate to the given site conditions. BACPAC SYSTEMS WITH DIRECT DISCHARGE OR WATER RE-USE (typically for systems >15,000 gpd) • Solids Settling or Collection Biological solids generated in the bacpac modules can be anaerobically digested in settling tanks or mechanically collected for disposal or nutrient recovery. Bio-solids can be pumped to drying beds or separated using centrifuge technology (in high flow applications). • Disinfection Final disinfection can be achieved using standard chlorine dosing or ultraviolet light technology. • Post Aeration Post aeration may be required by regulatory agencies to elevate oxygen levels AlgaePac™ SYSTEMS AlgaePac™ uses the same wheel technology, combined with clarification and disinfection, to achieve targeted effluent goals. • Collection System The collection system will be designed to meet the specific site conditions and may include a low pressure grinder pump system or gravity sewer system. • Primary Clarification A primary clarification tank will be used to reduce biochemical oxygen demand (BOD) and total suspended solids (TSS) in the raw wastewater. • Primary Algae Production Tank BOD removal and initial nitrogen and phosphorous conversion to biomass occurs as the waste stream passes through the multi-wheel chamber. • Secondary Clarification Secondary clarification provides removal of algae and bacteria biomass generated in the primary algaewheels. • Secondary Algae Production Tank Substantially all the remaining BOD is converted to CO2 by bacteria, and all of the CO2, nitrogen, and phosphorous are removed by the algae. • Tertiary Clarification Tertiary clarification provides final removal of algae and bacteria biomass generated in the secondary algaewheels from the treated water. • Disinfection Water passes through final disinfection. Disinfection is achieved by an ultraviolet light system or chlorine dosing technology. • Biomass Collection Biomass settled in the three clarifier tanks is collected via gravity or airlift pump in a central biomass tank to await biomass processing. • Biomass Processing Biomass processing is project specific. A typical system will include a centrifuge for dewatering and then solar drying. Final processing could be with combustion or other thermal processes to provide a beneficial use of the valuable algae biomass

 

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