What Process Suits Pig Farm Wastewater?

Pig farm wastewater suits a UASB + AOAO train — UASB (Upflow Anaerobic Sludge Blanket) removes the bulk of organic load and recovers biogas at 55–65% CH₄, while AOAO (Anaerobic-Anoxic-Oxic) polishes ammonia and nitrogen to meet discharge. Pig manure water is high in COD, ammonia, and SS, so the anaerobic-first, aerobic-second arrangement handles both energy recovery and nutrient limits.

Why UASB First

After solids separation, the liquid pig-manure stream is warm and soluble enough for UASB at OLR 5–15 kg COD/m³·day. It strips 70–90% of COD and yields biogas with almost no aeration energy, lowering the load on the downstream aerobic stage.

Why AOAO Second

UASB leaves ammonia and residual COD; AOAO’s anaerobic-anoxic-oxic sequence removes nitrogen (and helps phosphorus) to discharge limits. For pig farms, this two-stage pairing is the most common, robust configuration.

Technical Considerations

Pig wastewater is corrosive (H₂S, ammonia) and arrives in flushing surges, so size equalization and specify H₂S-resistant tankage. Bolted Glass-Fused-to-Steel (glass fused at 820–930°C) is the standard inert barrier; plan insulation for cold farms and manage grit to protect seals.

How to Scope and Install

Confirm daily volume and COD/ammonia, set the discharge limit, size UASB by OLR and AOAO by nitrogen load, then plan installation: foundation, bolted GFS erection, piping, and commissioning. A staged install minimizes farm downtime; technical support during start-up protects the granular sludge.

Project Case Study

Beijing 5S Pig Farm Wastewater Treatment Project. A 580 m³/day pig-farm plant using UASB + AOAO (physical + biological + chemical), achieving COD from ≥ 10,000 to ≤ 200 mg/L, ammonia-N from ≥ 1,000 to ≤ 80 mg/L, and fecal coliforms from ≥ 5.6×10⁶ to ≤ 4.0×10³ CFU/100ml. A documented installed pig-farm UASB + AOAO system.

About Center Enamel

Center Enamel provides installation and technical support for pig-farm wastewater trains, supplying bolted Glass-Fused-to-Steel (GFS) UASB and AOAO tankage with on-site erection guidance and commissioning support — as delivered on the Beijing 5S pig farm (580 m³/day, UASB + AOAO, 2020). The company handles foundation coordination, tank assembly, and start-up to protect granular-sludge health.

Advantages and Limitations

UASB + AOAO recovers biogas while meeting strict ammonia/nitrogen limits — ideal for pig farms. Limits: equalization is essential for flushing surges, and H₂S duty demands inert lining. Modular GFS tanks speed installation and later capacity expansion.

Comparison: Pig Wastewater Routes

Pig farm wastewater suits UASB + AOAO: UASB removes 70–90% COD and recovers biogas, AOAO polishes ammonia and nitrogen. Scope by volume and limit, install GFS tankage with equalization and H₂S-resistant lining, and use commissioning support to protect the sludge.

Frequently Asked Questions (FAQ)

Q1: What process suits pig farm wastewater?

A: UASB + AOAO — UASB cuts COD and makes biogas, AOAO removes ammonia and nitrogen to discharge.

Q2: How much COD can it cut?

A: UASB alone removes 70–90% COD; the documented Beijing pig farm reached ≥ 10,000 → ≤ 200 mg/L overall.

Q3: Does it make biogas?

A: Yes, roughly 0.30–0.45 m³ per kg COD removed at 55–65% CH₄.

Q4: What tank material suits pigs?

A: Glass-Fused-to-Steel, glass fused at 820–930°C, resists H₂S and ammonia.

Q5: How is it installed?

A: Foundation, bolted GFS erection, piping, then commissioning with start-up support to protect granular sludge.

Q6: What capacity is available?

A: Center Enamel supplies GFS tanks from 200 m³ to 60,000 m³ for pig-farm trains.

Send your pig-farm daily volume, COD, and ammonia plus discharge limit. We will size UASB + AOAO, plan GFS installation, and provide commissioning support for your plant.