Hotel Wastewater Treatment Solution for Cosmetic Oil | Solution

Mefit’s 3-Free Direct Filtration Technology—A Wastewater Treatment Solution for Cosmetic Oil Contamination in Overseas Hotels

Myfuter Water (Guangdong) Co., Ltd. has developed a 3-Free direct filtration technology (no power required for water production, no consumable replacement, and no distinction in influent). Featuring a dual-core design that combines front-end oil removal with direct filtration and back-end biochemical sludge optimization through natural selection, this technology precisely addresses the industry’s pain points—such as high concentrations of emulsified oils from cosmetics in hotel wastewater, inhibition by surfactants, difficulty in cultivating biofilms in biochemical systems, and significant load fluctuations—thereby achieving stable effluent compliance, minimal operation and maintenance, and long-term reliable operation.

I. Core Definition of the Technology

The “3-Free” direct filtration technology is based on the ASSFBR patent for gravity-fed suspended-media direct filtration, fundamentally transforming conventional oil–water separation, air flotation, and sedimentation processes. It relies on gravity-driven flow to achieve emulsion breaking and oil removal combined with precision filtration, while integrating a biofilm-based microbial selection and optimization mechanism at the biochemical stage. This creates a closed-loop process that ensures “oil removal at the front end to protect the biochemical system, and microbial selection at the back end to stabilize operation,” perfectly meeting the demands of overseas hotels for decentralized systems, low O&M costs, and stringent effluent discharge standards.

- Power-free water production: driven by the water level difference, eliminating the need for a pressurization pump and reducing energy consumption by more than 70%;

- No consumable replacements: the core filter element is automatically backwashed and regenerated with air and water, eliminating the need for lifetime replacement;

- Non-discriminatory water intake: Tolerates peak-and-valley water usage and drastic fluctuations in water quality, eliminating the need for pre-conditioning.

II. End-to-End Process Design (Exclusive to Overseas Hotels)

Raw water → Grit chamber → Equalization and homogenization → Mefit TUFBR (front-end oil removal and direct filtration) → A/O biological treatment → ASSFBR sludge selection and optimization tank → Advanced disinfection → Compliance discharge/reuse

(1) Front-end Core: 3-Free Direct Filtration—Thorough Oil Removal, Ensuring Reliable Biochemical Treatment

To address the three major inhibitors in hotel wastewater—emulsified oil from cosmetics, surfactants, and suspended solids—achieve one-step pretreatment:

1. Micro-flocculation and demulsification: Coupled with the trace addition of PAC, this process neutralizes the electrical charge of emulsified oil droplets and colloids, disrupts surfactant-stabilized emulsions, and preserves biodegradable organic matter.

2. Dynamic Sludge Membrane Direct Filtration: The TUFBR vertical filter elements rely on gravity for water production, with the dynamic sludge membrane efficiently retaining floating oil, dispersed oil, emulsified oil, and suspended solids (SS). Oil removal efficiency is ≥95%, SS removal efficiency is ≥95%, and the influent oil concentration is <5 mg/L and SS concentration is <10 mg/L prior to biochemical treatment.

3. Automatic backwashing and sludge discharge: Differential pressure triggers air–water backwashing to detach the oil–sludge filter cake; the dewatered sludge is conveyed offsite, achieving a sludge volume reduction of ≥40%.

4. Replacing Traditional Processes: Eliminates the need for grease traps, dissolved-air flotation units, and primary sedimentation tanks, reducing the footprint by more than 50% and making it ideal for the compact spaces of overseas hotels.

(2) Biochemical Core: The ASSFBR System’s Sludge Undergoes Natural Selection—Solving the Challenges of Difficult-to-Cultivate Biofilms for Long-Term, Stable Operation

Based on the principles of survival priority, metabolic optimization, and senescence-driven elimination, this approach addresses issues such as sludge encapsulation by oil films, microbial toxicity, and sludge bulking:

1. Optimized aerobic zone: Equipped with specialized suspended carriers to enrich oil- and surfactant-tolerant dominant microbial communities (such as Pseudomonas and Bacillus), which form a stable biofilm that resists toxic inhibition; dissolved oxygen is maintained at 2–4 mg/L to prevent the formation of an oil film that encapsulates the sludge.

2. Competitive Exclusion Separation Zone: Precise sorting via a gradient flow field—dense activated sludge settles and recirculates, maintaining a high sludge concentration; aged oil sludge and inert flocs float to the surface and accumulate, then are periodically discharged, enabling automatic microbial community succession.

3. Rapid startup and shock resistance: Biofilm formation and acclimation are completed in 7–10 days, with excellent tolerance to fluctuations in hotel wastewater loading; COD removal efficiency is ≥85%, ensuring the biochemical system remains stable and does not fail.

III. Core Technological Advantages (Adapted to International Hotel Scenarios)

1. Core pain point: Eliminate cosmetic oils and surfactants at the source, thereby thoroughly resolving the challenges of difficult biochemical cultivation, excessive foaming, and sludge toxicity.

2. Minimalist Operations: No power required, no consumables, fully automated operation—no specialized O&M team needed, perfectly suited for unattended operations overseas.

3. Compliance and Stability: The effluent meets EU and local discharge standards, allowing for direct reuse or discharge, with fully automated monitoring throughout the entire process.

4. Cost-effective: low capital investment, small footprint, and low operating costs; compared with conventional technologies, O&M expenses are reduced by more than 60%.

5. Modular Adaptability: The integrated solution enables rapid installation, accommodates hotels of varying sizes, and facilitates swift deployment of overseas projects.

IV. Summary of Technical Value

Mafit’s 3-Free Direct Filtration technology tackles the challenge of treating cosmetic-oil-laden wastewater in overseas hotels by first employing a front-end, 3-Free direct filtration system to remove oil and thereby eliminate the root cause of biochemical inhibition, followed by a biofilm-based process that selectively favors robust microbial strains to maintain high microbial activity. This dual-pronged approach effectively resolves the longstanding treatment challenges posed by such wastewater, making it the preferred solution for reducing costs, improving efficiency, and ensuring consistent compliance with effluent standards in international hotel settings—thereby supporting hotels in achieving environmental compliance and sustainable, green operations.