Meeting strict discharge regulations while achieving sustainability goals requires robust and efficient wastewater treatment. Tailored solutions for the food and beverage industry enable reliable compliance, reduced environmental impact, and smarter use of water and resources.
In food and beverage production, water plays a critical role as a processing medium, a utility resource for cooling and steam generation, a sanitation agent, and as part of the final product formulation. As a result, a substantial portion of the water input becomes heavily contaminated wastewater, necessitating advanced treatment prior to compliant environmental discharge.
Across the many sub‑sectors of the food and beverage industry, brewing, meat production, soft drinks and fruit and vegetable processing are some of the most water-intensive. Owing to the diversity of operations, the resulting wastewater streams vary considerably. Nevertheless, they share a common feature: high pollution potential from significant levels of organic matter, commonly reflected in high BOD and COD values. Food and beverage wastewater may also carry suspended solids, nutrients, salts, and traces of cleaning agents or pesticides.
Wastewater facilities in the food and beverage sector typically rely on biological treatment to remove organic matter and nutrients. Since each type of production generates its own characteristic contaminants, both pretreatment and bioprocess design must be adjusted accordingly. Beverage plants often produce wastewater rich in sugars and other soluble carbohydrates; poultry processing generates protein‑laden wastewater that may require nitrogen removal; and vegetable processing can introduce large amounts of suspended solids as well as pesticide residues. Together, these cases illustrate just how diverse wastewater challenges can be across the industry.
Tightening discharge regulations, rising discharge fees, and the increasing cost of freshwater have made water management a critical priority for the food and beverage industry. At the same time, environmental stewardship and brand reputation are now key drivers pushing manufacturers toward advanced wastewater treatment solutions.
In his landscape, food and beverage producers are continuously striving to enhance efficiency and sustainability. Their main goals include reducing water consumption, minimizing wastewater generation, and optimizing energy use. Increasingly, facilities are also integrating water reuse where feasible and adopting waste‑to‑energy technologies. Together, these strategies support more resilient operations while meeting both regulatory and environmental expectations.
One of the key challenges in treating food and beverage wastewater is the high variability of the influent. Sudden fluctuations in flow and pollutant load, temperature variations, shifts in production schedules, accidental product spills, wash‑water discharges, and limited equalization capacity all contribute to operational instability, making it difficult for treatment systems to consistently perform at their best.
As a result, effectively treating this type of wastewater can be demanding, and in many cases, conventional activated sludge systems struggle to cope with large and abrupt changes in influent conditions. This is why membrane‑based technologies are becoming increasingly popular across the food and beverage industry, offering several significant advantages:
Consistently high effluent quality, meeting even the most stringent discharge standards
Production of high‑quality reusable water for a wide range of non‑contact applications
Production of high‑quality reusable water for a wide range of non‑contact applications
Berghof tubular UF membranes have established themselves as a reliable, high‑performance technology for wastewater treatment in the food and beverage industry. More than 150 aerobic and anaerobic MBR systems equipped with Berghof membranes are operating successfully around the world across nearly all food and beverage sub‑sectors. These include distilleries, breweries, meat processing and slaughterhouses, vegetable processing, snacks production, confectionery, malt manufacturing, soft‑drink facilities, and potato‑starch plants. These installations have delivered years of stable, robust, and reliable performance, confirming the technology’s long-term value and operational resilience.
Berghof solutions based on tubular UF cover most of the new demands and trends in food and beverage wastewater management:
Seasonal fluctuations, batch-based production, and intensive cleaning and sanitizing routines create highly variable wastewater streams in the food and beverage industry, demanding treatment technologies that are both robust and flexible. Berghof external membranes are designed to handle exactly this kind of variability. Their cross‑flow operation, effective fouling‑prevention strategies, and adaptive operating modes work together to deliver a highly reliable and cost‑efficient solution for treating even the most challenging wastewater conditions.
The external MBR is a natural evolution of the conventional activated sludge process, replacing clarifiers with tubular membranes, that is increasingly being adopted for food and beverage wastewater treatment.
The MBR produces consistently superior effluent quality, completely free of suspended solids and turbidity. Unlike alternative technologies, MBR can achieve COD removal efficiencies of up to 99%. At the same time, the compact design minimizes the required footprint, an important advantage in food and beverage facilities, where space is often at a premium.
The Berghof tubular MBR offers several additional advantages for treating medium-strength food and beverage wastewater:
Robustness
Organic load peaks often overwhelm conventional treatment systems and can significantly accelerate fouling in submerged membrane configurations. Berghof’s external tubular systems, however, are designed to easily accommodate these fluctuations, ensuring exceptionally stable operation under all conditions. Their robust construction and optimized cross‑flow hydraulics support long membrane lifespans, with service durations easily exceeding 8–10 years.
Efficiency
MBR operation enhances bioprocess efficiency by enabling long sludge ages. This promotes the development of a specialized and resilient biomass that is far less sensitive to fluctuations in influent composition, including the presence of cleaning agents, biocides, and pesticides.
Hygienic operation
The closed UF configuration eliminates odor emissions and minimizes health and safety risks — an essential requirement in the food and beverage sector, where hygiene standards are exceptionally high. In external UF systems, the biological sludge remains completely contained, avoiding any contact with the surrounding atmosphere. Maintenance operations are straightforward, safer for operators, and require minimal downtime, ensuring both operational reliability and compliance with strict hygiene expectations.
The various waste streams generated throughout food and beverage production are first collected in an equalization tank. At this stage, pH correction is often necessary, as the extensive use of cleaning and sanitizing agents leads to strong fluctuations in influent pH.
Certain food processes also release significant amounts of oil and grease into the wastewater. In such cases, a dissolved air flotation pretreatment step is typically installed to remove these constituents and prevent their negative impact on the downstream biological process.
The tubular MBR serves as the core treatment technology for medium‑strength food and beverage wastewater. When nitrogen removal is required, the biological treatment includes both anoxic and aerobic zones. For applications focused solely on organic load reduction, an aerated bioreactor alone is sufficient.
The MBR effluent consistently meets the discharge requirements for release into surface waters. Alternatively, it can be reused in non‑contact applications such as steam generation or cooling towers. For reuse scenarios requiring demineralized water quality, a final reverse osmosis step is added to the treatment train.
As the food and beverage industry intensifies its efforts to reduce water footprint, it increasingly generates higher‑strength wastewater streams. These concentrated effluents present additional challenges for achieving efficient and reliable treatment. With a positive net energy balance and a superior effluent quality that avoids complex post-treatment, AnMBR offers highly competitive initial investment and operating costs.
AnMBR enables efficient energy recovery from food and beverage wastewater streams. In the AnMBR, tubular UF membranes are coupled with a simple CSTR digester, allowing operation at high organic loading rates while still producing a high‑quality effluent. The external Berghof membranes ensure complete biomass retention inside the anaerobic reactor, significantly enhancing the digestion process — improving robustness, reducing footprint, and boosting biogas production. Within the food and beverage sector, AnMBR offers major advantages over granular‑sludge‑based anaerobic technologies such as UASB and EGSB, particularly in terms of stability, flexibility, and effluent quality.
Biogas production
Biogas production is significantly increased thanks to the higher COD removal achieved compared with conventional anaerobic technologies, maximizing overall energy recovery from the wastewater stream.
Ability to handle high TSS and FOG
Unlike granular anaerobic systems, which are prone to degranulation under these conditions, leading to biomass washout, reduced efficiency, and poorer effluent quality, AnMBR maintains stable performance even when exposed to elevated TSS and FOG levels.
Effluent Quality
COD removal rates up to 98 – 99 %, combined with complete solids retention, ensuring consistently high quality effluent suitable for direct discharge or, when required, for polishing through RO to enable water reuse within the food or beverage facility.
The high‑strength wastewater streams generated throughout food and beverage production are first routed to an equalization tank. At this stage, pH correction is typically required, as the intensive use of cleaning and sanitizing agents creates substantial pH variability. Nutrients and micronutrients are also commonly dosed here to ensure stable anaerobic biological performance.
The tubular anaerobic MBR then treats the wastewater in a single, efficient step, removing organic pollutants while converting them into renewable energy in the form of biogas. At the same time, it delivers a high‑quality treated effluent. This permeate is suitable for discharge to the sewer and, in many cases, even meets the standards required for direct discharge into receiving surface waters. When water reuse is targeted, a downstream RO step enables the production of high‑purity recycled water.
Soft drinks, breweries, and juice manufacturing are prime examples of industries that generate substantial volumes of RO reject and cooling tower blowdown (CTBD) during their production processes. With growing efforts to minimize the water footprint and achieve ZLD or MLD, recovering these streams, often characterized by high hardness and silica concentrations, becomes increasingly attractive. By integrating our Chemical Resistant CR modules with lime precipitation, this recovery is accomplished through a straightforward process arrangement and with reduced chemical consumption.
Effluent quality
The permeate quality is far superior to clarifier‑treated water, delivering complete removal of suspended solids, turbidity below 1 NTU, and an SDI of less than 3. Permeate can be fed directly into the RO system, avoiding intermediate steps such as multimedia filters or hollow fiber membranes.
Full reliability
Upsets in feed water quality often compromise the effluent quality of clarifiers and multimedia filters. UF membranes function as a complete physical barrier for precipitates. Regardless of process fluctuations, absence of solids in UF permeate is guaranteed.
Less chemicals
Coagulants are generally not required, and no flocculants are needed. Excess lime addition to promote coagulation of fine precipitates is also unnecessary. As a result, chemical consumption is typically reduced by 25 – 30 % compared with conventional gravity‑settling processes.
Compactness
Only a single separation step is required before the RO system, which significantly reduces the overall footprint. Compared with conventional treatment trains, typically involving clarifiers, multimedia filters, and hollow‑fiber ultrafiltration, this approach reduces footprint by more than a factor of three.
The RO brine or CTBD stream first enters the chemical precipitation tank. Depending on the specific treatment requirements, one or two reaction tanks may be installed. A two‑stage precipitation setup can provide a more efficient process in certain applications, enhancing pollutant removal and optimizing chemical consumption. During this stage, the required chemicals are added and pH is precisely controlled.
After chemical precipitation, the water is directed to the tubular UF system. The UF membranes retain and concentrate the precipitated solids, generating a highquality permeate with low TDS and a concentrated reject stream. After neutralization, the permeate is sent directly to the downstream RO system to achieve ZLD. The solidsrich reject is conveyed to a filter press for final solid–liquid separation, while the resulting filtrate is typically recycled back to the precipitation tank, improving overall process efficiency and minimizing waste generation.
This case study shows how an MBR system enables efficient wastewater treatment and water reuse in food & beverage production, ensuring stable performance and high-quality effluent despite fluctuating loads.
High-strength, variable dairy wastewater from multiple milk processing plants is efficiently treated using a combined AnMBR and MBR approach.
A dairy processor treats high-strength wastewater from multiple milk processing factories using AnMBR technology, achieving high effluent quality and energy recovery.
