Baihuipu Commissions Food Wastewater Anaerobic Reactor
Baihuipu has commissioned a high-rate anaerobic reactor for a food processing plant producing ready meals and sauces. The installation sits ahead of the site's existing aerobic system, taking the high-COD production effluent that previously consumed most of the aeration capacity. By removing the bulk of the organic load without air, the reactor cuts electricity use on the aerobic stage and produces biogas that the client routes to a boiler. Commissioning and biological start-up were completed over a staged ramp-up tied to the plant's production schedule.
Key Features and Benefits
Load Off the Aeration Basin
Food processing effluent with soluble COD in the thousands of mg/L is a poor fit for aerobic treatment as a first step — the blowers spend their energy on load that bacteria could remove without oxygen. The anaerobic reactor takes that fraction first. We have written about the downstream implications separately in Pectin Extraction Wastewater Treatment system.
We set out the wider process route in advanced oxidation.
With the aerobic stage now polishing a much smaller residual load, dissolved oxygen control is steadier and the plant holds its discharge consent through production peaks that previously caused excursions. The same selection criteria reappear in Potato Starch Plant Effluent, which is worth opening alongside this one.
Granular Sludge and Start-Up Discipline
Start-up followed a stepped loading programme rather than a rush to design flow. Granular sludge bed expansion, volatile fatty acids and gas production were tracked daily through the ramp, which is what keeps a reactor stable in its first months. The same selection criteria reappear in Poultry Processing Wastewater Treatment system, which is worth opening alongside this one.
The reactor includes internal recirculation and a three-phase separator sized for the expected gas load, so hydraulic upflow can be adjusted without disturbing the sludge blanket.
Measured Results from Plants We Built
We commissioned a 60 m³/day plant for this duty in Foshan, Guangdong back in 2021. Feed COD came in around 2,000 mg/L and left at 90 mg/L — 95.5% removal.
A second unit of the same class, delivered in Hong'an, Hubei during 2021, ran 150 m³/day at 1,961 mg/L feed COD down to 200 mg/L.
| Location | Year | Flow | Feed COD | Treated COD | Removal |
|---|---|---|---|---|---|
| Foshan, Guangdong | 2021 | 60 m³/d | 2,000 mg/L | 90 mg/L | 95.5% |
| Hong'an, Hubei | 2021 | 150 m³/d | 1,961 mg/L | 200 mg/L | 89.8% |
Figures are site-measured values from commissioned plants, not modelled estimates.
Biogas as a By-Product, Not a Promise
Gas from the reactor is used on a boiler where it displaces purchased fuel. We quote the expected range from feed COD and observed loading, and we say plainly that the figure depends on how the production line actually runs.
Downstream, the existing aerobic stage and clarifier were retained and rebalanced, so the project added one reactor rather than replacing a working plant.
Technical Specifications
Measured scope of the commissioned reactor and its effect on the existing train:
| Item | Before | After |
|---|---|---|
| High-COD stream treatment | direct to aerobic basin | anaerobic reactor first |
| Aerobic stage duty | full organic load | polishing residual load |
| Aeration electricity | baseline | reduced (site metering) |
| Biogas | none | routed to boiler |
| Existing clarifier | retained | retained and rebalanced |
Why Choose Baihuipu as Your Manufacturer
Two decades in this industry teaches you that most treatment problems are procurement problems in disguise. Someone bought the cheapest skid, nobody checked the equalisation volume, and eighteen months on the plant cannot hold its consent limit. We build differently.
Manufacturing Base in Guangdong
Owned production lines mean we control tolerances, materials and delivery. Standard modular units and bespoke skids are both built by our own people, so schedule commitments are ours to keep.
Documentation You Can Actually Audit
Each system ships with as-built drawings, material certificates, welding records and a functional specification. If a client's own consultant wants to review the process calculation basis, we hand it over rather than treating it as proprietary.
20+ Years Across Dozens of Industries
Experience matters most when your waste stream behaves nothing like the textbook example. We have dealt with toxic organics, heavy metals, extreme salinity and refractory COD in food processing, chemical manufacturing, electroplating, mining and municipal projects.
Complete System Responsibility
One supplier, one process guarantee. We take the plant from preliminary screening through to membrane separation, evaporation and brine management, with process, mechanical, electrical and controls engineering handled internally.
Certification and Export Practice
CE marking is standard and we work to ISO 9001 procedures. Where a project calls for specific material grades, pressure vessel certification or ATEX-rated equipment, we build to that standard and ship the full documentation pack.
After the Handover
Spares for everything we install are held in stock. Remote telemetry is available on most systems, and our service engineers commission, train your operators and turn out for emergencies.
Let's Look at Your Numbers
Share your water analysis and site constraints and we will give you a straight assessment of the process route and the realistic operating cost before you commit to anything. Contact our engineers at WhatsApp: +86 13631765076, or find us at hkbhp.com.
WhatsApp: +86 13631765076
Customer FAQs
Is an anaerobic reactor suitable for all food wastewater?
It suits streams with high soluble COD and reasonably stable temperature and flow. Streams with high fat, oil, grease or sanitizer shocks need equalization and sometimes a pretreatment step first.
How long does biological start-up take?
A stepped loading programme typically runs several weeks, longer if granular sludge has to be grown rather than seeded. Rushing this stage is the most common reason reactors underperform later.
How much biogas will the plant produce?
It scales with the COD actually removed anaerobically. We estimate a range from the feed analysis and operating load, then verify it with site gas metering after commissioning.
Can the existing aerobic plant be kept?
Usually yes. On this project the aerobic basin and clarifier were retained and rebalanced to polish the lower residual load, which cost far less than rebuilding the train. The operating detail behind this sits in textile water reuse.
Readers planning similar projects often also read Purified Water and Water for Injection for the process detail behind these systems.
