Application Advantages of the “3-Free” Direct Filtration Technology in Aquaculture Wastewater Treatment

　　Abstract

　　To address the challenging treatment of pig-farming wastewater—characterized by high suspended solids, high ammonia nitrogen, and significant hydraulic fluctuations—Myfuter Water has innovatively integrated its “3-Free” direct filtration technology into the entire treatment process, creating a closed-loop solution that spans from “source-level pretreatment” to “end-of-line sludge–water separation and microbial community optimization.” This approach fundamentally overcomes the bottlenecks of conventional processes, such as high capital investment, substantial energy consumption, and operational instability.

　　Innovative two-stage direct filtration process:

　　I. Industry Pain Points: The Structural Dilemma of Traditional Processes

　　Conventional swine wastewater treatment typically employs a linear process consisting of “solid–liquid separation + anaerobic treatment (UASB/black-membrane system) + A/O process + secondary sedimentation tank,” which gives rise to the following intractable conflicts:

　　1. Carbon–nitrogen imbalance: Anaerobic processes convert substantial amounts of organic nitrogen into ammonium nitrogen, depleting high-quality carbon sources and thereby necessitating the continuous and costly addition of external carbon sources (such as methanol) for subsequent denitrification.

　　2. Sludge treatment is complex: excess sludge production is substantial, disposal costs are high, and the microbial community in the biochemical system has aged, leading to declining treatment efficiency.

　　3. Large land footprint: The process flow is lengthy, and the tank volumes are substantial; in particular, the biochemical tanks, secondary sedimentation tanks, and tertiary sedimentation tanks occupy large areas and exhibit low efficiency.

　　4. Cumbersome operation and maintenance: High dependence on chemicals, energy, and specialized operational expertise; membrane technologies such as MBR are prone to fouling and clogging, resulting in substantial maintenance costs.

　　II. Innovative Closed Loop: A Two-Stage Application System Featuring 3-Free Direct Filtration Technology

　　Mefit Water’s closed-loop solution redefines the treatment logic by precisely integrating a two-stage direct filtration system.

　　1. Front end: Strengthening pretreatment and carbon source preservation

　　(1) Process flow: The residual sludge remaining in the system is mixed with the raw water and then subjected to preliminary dewatering using a high-efficiency screw press. The resulting filtrate is immediately fed into the first set of the 3-Free Direct Filtration TUFBR system.

　　(2) Core Function: The direct filtration unit provides deep purification of high-concentration, highly colloidal filtrates, stably removing ≥97% of suspended solids and colloids while efficiently separating nitrogen-containing solids (feces and residues) from the aqueous phase.

　　(3) Key achievement: The carbon-to-nitrogen ratio (C/N) of the effluent has been perfectly maintained and optimized, providing an inherent advantage for subsequent biochemical denitrification and enabling direct bypass or simplification of conventional anaerobic stages (UASB/black-membrane systems), thereby eliminating the core conflict of C/N imbalance.

　　2. End Point: Intelligent Sludge-Water Separation and Microbial Community Evolution

　　a. Process flow: The mixed liquor from the aerobic biochemical tank does not enter the secondary sedimentation tank; instead, it is directly pumped into the second ASSFBR system with 3-Free and direct filtration.

　　b. Core role:

　　High-efficiency separation: produces a clear supernatant with extremely low suspended solids (SS), directly meeting stringent discharge or reuse standards.

　　Selective retention and elimination of microbial flocs: the system automatically retains and recirculates highly active, well-settling floc aggregates while naturally discharging low-activity, aged sludge fragments.

　　Dynamic optimization: This process achieves “continuous selection” and “self-renewal” of the microbial community in the biochemical system, significantly enhancing system activity and shock resistance.

　　III. Closed-Loop Advantages: From Technological Breakthroughs to Commercial Value

　　Integrating the “3-Free” direct filtration technology into the wastewater treatment process of pig farms offers value that extends far beyond improvements in a single stage:

　　1. Investment and Land Savings: Efficient pretreatment and biochemical separation streamline the overall process flow and significantly reduce the volume of biochemical tanks, thereby substantially lowering capital investment and land use.

　　2. Dramatic reduction in operating costs: virtually eliminates or minimizes the addition of pretreatment chemicals; features a non-powered design that lowers electricity consumption; optimized microbial communities reduce residual sludge disposal costs; and system stability further reduces overall management expenses.

　　3. Stability and Compliance Assurance: By controlling the influent load at the source and optimizing the microbial community at the effluent end, this dual-layer approach ensures unprecedented system stability and significantly enhances the compliance rate of the treated effluent.

　　4. Ultra-simplified management: The “3-Free” characteristics and automated operation minimize daily maintenance efforts, reducing reliance on specialized operations and maintenance personnel.

　　In summary, the “3-Free” direct filtration technology offers a revolutionary, integrated solution for swine farm wastewater treatment, encompassing “high-efficiency pretreatment, intelligent sludge–water separation, and dynamic microbial community optimization.” By shifting from passive treatment to proactive optimization, this technology leverages innovation to achieve systematic breakthroughs in treatment efficiency, economic benefits, and operational reliability, thereby serving as a key technological pathway for advancing environmental compliance and sustainable development in the livestock industry.

　　This document is for reference only; the specific technical solutions and performance parameters must be designed and validated based on the actual water quality and operating conditions. Please feel free to contact us for a customized technical assessment and tailored solution.