Sewage control is a critical component of public health and environmental protection. At Allon Consulting, our sewage control engineers design and manage systems for the safe collection, conveyance, treatment, and disposal of wastewater. We work on everything from small on‑site systems to regional trunk sewers and large‑scale treatment plants, ensuring compliance with stringent regulations while minimizing environmental impact.
Sanitary Sewer Collection Systems
We design sewers that efficiently transport wastewater:
- Gravity sewers – pipe sizing, slope determination, manhole spacing, and bedding requirements per ASTM and local standards.
- Force mains – pressure pipe design, surge analysis, and air release valve placement.
- Lift stations – wet well sizing, pump selection (submersible or dry‑pit), control systems, and emergency power.
- Odor control – chemical dosing, biofilters, and carbon scrubbers for nuisance odors.
- Inflow and infiltration (I/I) reduction – smoke testing, CCTV inspection, and rehabilitation to reduce extraneous flows.
On‑Site Wastewater Systems
For properties without municipal sewers:
- Septic systems – design of septic tanks, distribution boxes, and drainfields (conventional and alternative).
- Advanced treatment units – aerobic systems, sand filters, and peat filters for nutrient reduction.
- Cluster systems – community collection and treatment for small subdivisions.
- Permitting and soil evaluations – percolation testing, soil profiles, and regulatory approvals.
Sewage Treatment Plants (STPs)
We provide end‑to‑design for treatment facilities:
- Preliminary treatment – bar screens, grit chambers, and flow equalization.
- Primary treatment – sedimentation tanks with scum removal.
- Secondary treatment – activated sludge (conventional, extended aeration, SBR), trickling filters, MBBR, and MBR.
- Tertiary treatment – filtration, disinfection (UV, chlorine), and nutrient removal (nitrogen, phosphorus).
- Sludge handling – thickening, anaerobic digestion, dewatering (centrifuges, belt presses), and biosolids management.
- Plant automation – SCADA systems for remote monitoring and control.
Effluent and Discharge Management
We ensure treated wastewater meets environmental standards:
- Discharge permits – compliance with federal, state, and local effluent limits.
- Receiving water impact assessment – mixing zone analysis, aquatic life protection.
- Reuse applications – design of irrigation systems, industrial reuse, or groundwater recharge.
Sewer Rehabilitation and Asset Management
Extending the life of aging infrastructure:
- Condition assessment – CCTV inspection, sonar, and laser profiling.
- Trenchless rehabilitation – CIPP lining, pipe bursting, slip lining, and grouting.
- Manhole rehabilitation – coatings, liners, and frame/chimney seals.
- Asset management plans – prioritization of repairs, replacement cycles, and lifecycle cost analysis.
Regulatory Compliance and Environmental Protection
We help clients navigate:
- National Pollutant Discharge Elimination System (NPDES) permits.
- Local sewer use bylaws – pretreatment requirements for industrial dischargers.
- Watershed protection – planning to prevent overflows and protect sensitive water bodies.
Innovation and Sustainability
We incorporate cutting‑edge approaches:
- Energy recovery – biogas utilization from anaerobic digestion for cogeneration.
- Nutrient recovery – struvite precipitation for phosphorus recovery.
- Decentralized systems – satellite treatment with local reuse.
- Green infrastructure – integrated wet weather management with bio‑retention and permeable pavements.
Typical Projects
- Design of a 10 km sanitary sewer trunk line with three lift stations for a new subdivision.
- Upgrade of a 20 MLD STP to include nutrient removal and UV disinfection, meeting stringent lake‑discharge limits.
- Sewer rehabilitation program using CIPP lining for 15 km of old clay pipe, eliminating infiltration and extending service life by 50 years.
- Industrial pretreatment program design, including equalization tanks and pH control for a food processing plant.
Our sewage control engineers are dedicated to protecting public health and the environment through robust, innovative wastewater infrastructure. We work collaboratively with municipalities, industries, and regulatory agencies to deliver systems that are efficient, reliable, and sustainable.
