50 TPD Integrated Sewage Treatment Equipment: Price Guide & Selection Parameters

Sizing an integrated sewage treatment system for a community, factory, or highway service area usually starts with one number: 50 tons per day. A 50 ton per day sewage treatment equipment sits in the sweet spot of small-to-midscale decentralized wastewater projects—large enough to serve hundreds of people, compact enough to ship as a single factory-assembled unit. But the price tag and technical fit vary widely depending on process selection, shell material, and discharge standards. This guide walks through the real cost drivers, key selection parameters, and operational expectations for a 50 m³/d integrated wastewater treatment plant.

What Does a 50 TPD Integrated Sewage Treatment Plant Look Like?

A 50 m³/day integrated wastewater treatment plant is typically delivered as a single skid-mounted or containerized unit. Most designs adopt an A²/O (anaerobic-anoxic-aerobic) or AAO + MBBR process configuration, with the tank fabricated from carbon steel with epoxy coal-tar anti-corrosion coating—the workhorse material for domestic sewage applications. For reference, a 50 m³/d unit using a Φ3000×7500 mm tank weighs approximately 4.9 tons and carries an installed power around 0.93–7.87 kW depending on the process and aeration configuration.

Because these units are factory-assembled and test-run before shipment, on-site construction is limited to a foundation pad, pipe connections, and electrical hookup. Installation can be completed in 3–7 working days for a standard unit.

Influent Characteristics: What the Equipment Must Handle

Before any equipment selection begins, the raw wastewater profile determines whether a standard biological process will work or whether pre-treatment is required. Typical domestic sewage feeding a 50 TPD system carries COD in the 300–800 mg/L range, BOD₅ of 150–400 mg/L, SS of 200–400 mg/L, and NH₃-N of 20–50 mg/L. These concentrations are well-suited to conventional biological treatment.

Industrial or mixed wastewater changes the calculus. If the stream contains oils, heavy metals, or refractory organics, a pre-treatment module—dissolved air flotation, chemical precipitation, or Fenton oxidation—must be added ahead of the biological stage. This is the single largest factor that pushes a “standard” 50 TPD quote upward.

Core Selection Parameters for a 50 TPD System

Treatment Process

Three process families dominate the 50 TPD segment, and the choice directly shapes both capital cost and operating complexity:

• A/O or contact oxidation: Lowest capital cost, simple operation, suited to COD 300–800 mg/L domestic sewage without strict nutrient limits. COD removal typically reaches 80–90%.

• AAO + MBBR: Better nitrogen and phosphorus removal, more resilient to flow and load fluctuations. MBBR’s moving biofilm carriers reduce the required tank volume and simplify sludge management. Operational costs for MBBR-based systems tend to run 15–25% lower than comparable SBR systems when automation and failure risk are factored in.

• MBR (membrane bioreactor): Ultrafiltration membranes replace the secondary clarifier, producing effluent with SS below 10 mg/L—suitable for direct reuse or strict Grade A discharge. The trade-off is higher capital cost (membrane modules alone account for 30%+ of equipment cost) and periodic membrane cleaning or replacement.

Shell Material

Carbon steel with double anti-corrosion treatment (epoxy coal tar or glass flake coating) is the standard for domestic sewage. For industrial streams containing acids, alkalis, or chlorides, 304 or 316 stainless steel is specified at a 15–30% cost premium over carbon steel. FRP (fiberglass reinforced plastic) sits between the two in both cost and corrosion resistance.

Discharge Standard

Every step up in discharge standard adds treatment units and cost. Grade B under GB 18918-2002 requires only basic biological treatment plus sedimentation and disinfection. Grade A requires additional filtration and, in many cases, membrane separation. Reuse-grade effluent demands UV or ozone disinfection and often a polishing step.

Automation and Controls

A 50 TPD unit is frequently unmanned. Standard automation includes liquid-level control for the transfer pump, timed or DO-based aeration control, and sludge return cycling. Remote monitoring via 4G or Ethernet is increasingly common, allowing operators to check flow, dissolved oxygen, and alarm status from a phone.

50 TPD Integrated Sewage Treatment Equipment Price Breakdown

As of 2026, the market price for a complete 50 ton per day integrated sewage treatment system falls into three broad bands depending on process and configuration:

• AO / contact oxidation, carbon steel: RMB 80,000–250,000 (approximately USD 11,000–35,000) for the equipment package. This covers the reactor tank, blowers, transfer pumps, internal piping, and basic control panel.

• AAO + MBBR, carbon steel: RMB 120,000–200,000 (USD 17,000–28,000), reflecting the additional anoxic/anaerobic zones, biofilm carriers, and mixing equipment.

• MBR, carbon steel or stainless: RMB 180,000–450,000 (USD 25,000–63,000). The membrane modules, suction pumps, and more sophisticated controls drive the upper range. A 2025 cost study pegged the full turnkey investment for a 50 TPD project—including equipment, transport, installation, and commissioning—at roughly RMB 250,000 (USD 35,000) for an advanced-treatment configuration.

Two cost components sit outside the equipment quote and must be budgeted separately:

• Civil works: Foundation, inlet/outlet piping, and electrical conduit. Typically RMB 50,000–100,000 (USD 7,000–14,000) for a 50 TPD installation.

• Installation and commissioning: RMB 30,000–50,000 (USD 4,200–7,000) for a standard site with good access.

Operating cost for a 50 TPD AO or MBBR system runs approximately RMB 0.6–1.3 per ton of water treated, driven primarily by aeration electricity. MBR systems push this to RMB 1.2–2.0 per ton due to membrane air scouring and more frequent maintenance. At 50 tons per day, the daily electricity cost for a typical AO system lands in the RMB 20–40 range.

Common Mistakes in 50 TPD Equipment Selection

Ignoring peak flow. A 50 m³/d average is not 50 m³/d every hour. Morning and evening surges in residential applications can hit 2–3× the average. The equalization tank must be sized to absorb this, or the biological process will wash out.

Over-specifying the process. MBR is often quoted when a well-designed AAO + MBBR unit would meet the same discharge standard at 30–40% lower capital cost. MBR’s advantage—direct reuse-quality effluent and a smaller footprint—only justifies the premium when space is constrained or reuse is planned.

Underestimating sludge handling. Every biological process produces waste activated sludge. A 50 TPD system generates roughly 0.3–0.5 m³ of wet sludge per day. If the site has no sludge dewatering provision, this becomes a bottleneck within months.

Why Work with a Manufacturer That Controls the Full Chain

For a 50 TPD project, the difference between a smooth startup and a problematic one often comes down to how well the equipment supplier understands the intersection of process design, fabrication quality, and site conditions. Zhengzhou Puhua Technology has been manufacturing environmental protection equipment since 2008, with a production base of approximately 20,000 square meters and a technical team specializing in wastewater treatment (MBR, biological processes) as well as air pollution control systems including bag filters, RCO catalytic combustion units, RTO systems, and desulfurization towers. Their integrated sewage treatment equipment line covers domestic, hospital, livestock, and highway service area applications, with each unit designed around the actual influent profile rather than a one-size template.

For a 50 ton per day integrated sewage treatment equipment project, the right approach is to start with a water quality analysis, then work backward to process selection, material specification, and automation level. The quotes will vary—but the selection parameters above give you a framework to compare them on equal footing.