Sake Brewing Wastewater Treatment: Rice Wash, Lees and the Press Water
A sake brewery washes and steams rice, ferments it with koji and yeast through multiple additions, presses the mash and washes the lees between batches. The water it leaves is a seasonal, fermented rice effluent with a starch problem. Rice washing and steaming water carries the starch the grain released. Fermentation and press water add the sugar and the cloudy lees. Wash and lees handling arrive warm and brown in slugs. The effluent is starch-rich, warm and stronger than the rinse water looks, and the design that works screens the rice and lees solids, treats the starch as the strong, easy carbon it is, and rides the seasonal campaign that defines a brewery.
Where the Water Comes From
Rice washing and steaming water carries the starch the grain released and the fine rice solids. It is the volume of the plant and the stream the equalisation tank is sized against.
Fermentation and press water adds the dissolved sugar and the cloudy lees. Its contribution is the strongest organic load the biology must eat.
Lees and wash handling arrives warm and brown in slugs. It is the stream that sets the peak of the equalisation tank.
Floor and equipment washing adds volume rather than load, and its contribution is the hydraulic design of the whole plant. If your site also runs this kind of duty, battery separator production wastewater treatment covers the cost side of the decision in more depth.
Rice and Starch
Free rice solids are screened at the drain. A static screen on the wash line removes most of the load before it reaches anything expensive.
The recovered solids are returned to compost or animal feed where the local market allows it. A brewery that keeps them out of the drain removes most of its suspended problem at the source.
The dissolved starch is a strong, fully biodegradable carbon source. Treating sake water as a weak stream undersizes the biological stage by a wide margin.
Screens are cleaned on a schedule tied to the brew. A blinded screen sends the whole starch load forward at once, and the downstream flotation unit spends days recovering from an hour of neglect.
Lees and the Press
The cloudy lees are the character of the plant: high in organic load and slow to settle. Coagulation and flotation break them, and the dewatering step is specified with the sticky floc in mind. For the reuse angle specifically, LiPF6 Electrolyte Production effluent goes further than we can here.
Press water is the strongest single stream. Anaerobic treatment suits it, and the biogas offsets the steam the brewhouse already uses all day.
Nitrogen from the rice protein means some ammonia, and a compact anoxic zone keeps it inside consent. Foam from the protein traces appears in bursts, and a defoamer line is standard.
The warm press and wash streams arrive above the temperature biology tolerates. A cooling step or a mix point with cooler streams before the equalisation tank is not an optional refinement.
The equalisation tank converts the brewing campaign into a diet the biology can digest. It is sized against the warm slug, not the average flow.
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.
Sample the starch at the equalisation outlet. The truth about a sake brewery's load lives there, not at the final outfall.
Operating Notes
Screen the rice solids at the drain. The screen is cheap there and the flotation unit is expensive here.
Cool and equalise the warm streams. The biology should never see a hot slug or a starch spike it was not designed for. If your site also runs this kind of duty, Silicon-Carbon Anode Production Wastewater Treatment system covers the cost side of the decision in more depth.
Size the biology on the starch, not on the average. Sake water is stronger than it looks.
Integrated Treatment Strategies
If your site also runs this kind of duty, Electrolytic Copper Foil Production Wastewater Treatment covers the cost side of the decision in more depth. Most facilities do not run a single clean stream, and a shared equalisation and biological stage is usually the economical answer once the streams are chemically compatible.
Why Choose Baihuipu as Your Manufacturer
Picking a supplier for this kind of plant is mostly about who carries the risk when something goes wrong. We have built this equipment for more than twenty years, and we are the ones who fabricated it, programmed the controls and will still answer the phone three years from now.
Own Factory, Real Capacity
Tanks, skids, control panels and membrane housings are built in our own Guangdong facility. Nothing critical is subcontracted, which is why we can commit to delivery dates and hold quality across a batch instead of hoping the shop floor gets it right.
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.
Two Decades of Field Data
Food and beverage, chemicals, electroplating, textile dyeing, mining, municipal work — we have commissioned across all of them. The useful part is not the project count, it is having seen how plants fail in year seven and designing those failures out.
Twenty-Plus Export Markets
We have shipped to the United States, Canada, Russia, Indonesia, India, Nigeria and Vietnam among others. Crating, export documentation and certificates are handled in-house, which keeps customs surprises to a minimum.
We Engineer the Whole Train
Screening, equalisation, biological or chemical treatment, membranes, evaporation, brine handling — the complete line comes from one organisation. Process design, mechanical, electrical and PLC programming sit under the same roof, so there is no gap for finger-pointing at handover.
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
Frequently Asked Questions
Do you handle installation and operator training?
Every unit we supply is commissioned by our own engineers. Training happens on site with your actual operators, and the O&M manual covers routine work plus troubleshooting. Remote diagnostics through the control system are included for the first year.
How much operator attention does the system need day to day?
Automatic control handles dosing, backwash and level control. Realistically your team spends time on chemical top-up, sample testing and sludge handling — maybe one to two hours per shift on sake brewing duty, less if you opt for remote monitoring.
How do you handle sludge from this process?
Sludge handling is where most budgets quietly blow out. We size dewatering against realistic solids production, and we usually recommend a filter press for this duty. The disposal route — landfill, incineration, or a licensed contractor — should be confirmed before commissioning.
What information do you need to quote?
Water analysis for your worst-case stream, peak and average flows, discharge limits, available footprint and utilities. If you do not have a full analysis yet, we can start from a partial one and flag the gaps.
