Reclaimed water ultrafiltration equipment is specially optimized membrane separation equipment for tertiary advanced treatment of industrial biochemical wastewater and municipal sewage to realize water resource recycling. As a pollution-resistant heavy-duty industrial liquid filter customized for complex reclaimed water quality with high organic matter and suspended solids, our supporting product portfolio includes high-fouling resistant Concentrated Ultrafiltration Membrane Equipment, high-stable graded purification Dual Stage Ultrafiltration Equipment, small skid-mounted reclaimed water reuse Compact Small Scale Ultrafiltration Membrane Equipment and large-scale station integrated Complete Ultrafiltration Equipment to match different reclaimed water treatment scales and discharge standards. This paper systematically introduces the structural optimization design of reclaimed water ultrafiltration equipment, cross-flow anti-fouling working principle, special technical parameters for reclaimed water, strict factory quality inspection standards and actual reuse application scenarios, guiding enterprises to select matched ultrafiltration equipment to improve wastewater recovery rate and reduce fresh water consumption cost.
Durable Reclaimed Water Ultrafiltration Equipment for Industrial Reuse Projects
Reclaimed water ultrafiltration equipment is specially optimized membrane separation equipment for tertiary advanced treatment of industrial biochemical wastewater and municipal sewage to realize water resource recycling. As a pollution-resistant heavy-duty industrial liquid filter customized for complex reclaimed water quality with high organic matter and suspended solids, our supporting product portfolio includes high-fouling resistant Concentrated Ultrafiltration Membrane Equipment, high-stable graded purification Dual Stage Ultrafiltration Equipment, small skid-mounted reclaimed water reuse Compact Small Scale Ultrafiltration Membrane Equipment and large-scale station integrated Complete Ultrafiltration Equipment to match different reclaimed water treatment scales and discharge standards. This paper systematically introduces the structural optimization design of reclaimed water ultrafiltration equipment, cross-flow anti-fouling working principle, special technical parameters for reclaimed water, strict factory quality inspection standards and actual reuse application scenarios, guiding enterprises to select matched ultrafiltration equipment to improve wastewater recovery rate and reduce fresh water consumption cost.
Reclaimed water ultrafiltration equipment is different from conventional raw water UF equipment; it carries targeted reinforcement optimization for high COD, high suspended solids, microbial metabolites and residual flocculants in biochemical effluent. The whole system takes modified anti-pollution PVDF ultrafiltration membrane as the core, matched with wear-resistant pump body, large-flow cross-flow pipeline, enhanced chemical cleaning unit and anti-corrosion PLC control system, which is the core process unit between biochemical tank and disinfection/reuse water tank in the whole reclaimed water treatment process.
According to different reclaimed water treatment scale and reuse purpose, LEFILIER provides differentiated matched equipment displayed on the official website. For high-concentration industrial wastewater treatment with large organic load, enterprises can deploy Concentrated Ultrafiltration Membrane Equipment; the membrane channel is widened and optimized to slow down pollutant accumulation, suitable for continuous operation of high-pollution reclaimed water for a long time. When reclaimed water is used for factory circulating cooling water and green landscape water requiring stable water quality indicators, Dual Stage Ultrafiltration Equipment is adopted: primary filtration intercepts most flocs and suspended particles in biochemical effluent, secondary ultrafiltration removes residual colloids and microorganisms to guarantee stable reclaimed water quality. For small factory workshop wastewater reuse and small community sewage reuse projects, mini integrated Compact Small Scale Ultrafiltration Membrane Equipment occupies small space and supports mobile installation. For large industrial park centralized sewage reuse stations, the whole machine prefabricated and debugged Complete Ultrafiltration Equipment realizes centralized control of multi-group membrane modules to meet large-volume reclaimed water processing demands.
The frame of reclaimed water ultrafiltration equipment preferentially selects 304 stainless steel, and the membrane material adopts high-fouling resistant modified PVDF raw material. The control system is equipped with differential pressure early warning + enhanced alkali washing program aiming at the easy pollution characteristics of reclaimed water; regular online CIP cleaning effectively removes organic dirt and biological slime on the membrane surface. In the actual reclaimed water process flow, ultrafiltration equipment can effectively reduce the SS, turbidity and total bacterial count of biochemical effluent, making the effluent reach urban miscellaneous water reuse standard, greatly cutting the enterprise’s tap water purchase expenditure and sewage discharge fee.
The core working principle of reclaimed water ultrafiltration equipment is pressure-driven cross-flow physical sieving separation, and the biggest optimization compared with ordinary ultrafiltration is the large-flow cross scouring design of the pipeline. After the biochemical effluent (reclaimed water raw water) is boosted by the feed pump to the design pressure of 1.0 ~ 4.0 bar, the wastewater flows tangentially at high speed along the surface of the ultrafiltration membrane filaments.
Water molecules and soluble small-molecule inorganic salts pass through the membrane micropores to form qualified reclaimed water for reuse. Suspended flocs, macromolecular organic matter, bacteria, microbial extracellular polymers and other pollutants in biochemical wastewater are trapped on the outer surface of the membrane. The high-speed cross-flow mainstream continuously washes the membrane surface, takes most intercepted dirt out with concentrated water drainage, avoids the rapid formation of dense filter cake layer on the membrane surface caused by reclaimed water pollution, and ensures long-term stable water production flux of the equipment.
Two sets of enhanced maintenance programs are embedded in the control system of reclaimed water ultrafiltration equipment. First is frequent automatic backwashing: combined with the pollution characteristics of reclaimed water, the backwash frequency is higher than ordinary water ultrafiltration equipment to clean loose dirt in time. Second is periodic enhanced chemical cleaning: sodium hypochlorite + sodium hydroxide mixed lotion is used to remove biological film and organic fouling, and dilute acid is used to eliminate inorganic scale when the system flux decays obviously. Concentrated ultrafiltration equipment for heavy pollution reclaimed water will be equipped with circulating online cleaning function to further reduce membrane fouling speed.
Membrane material: Anti-fouling modified industrial PVDF (special for reclaimed water)
Optional MWCO: 50 kDa, 100 kDa (reclaimed water conventional configuration)
Membrane pore size: 0.01 ~ 0.1 μm
Long-term operating temperature: 5 ~ 40℃
pH working range: Continuous operation pH 2–11; cleaning pH 1–13
Design flux for reclaimed water: 20 ~ 65 LMH (low flux design to improve anti-fouling performance)
Optimal working pressure: 1.6 ~ 3.2 bar
System water recovery rate: 78% ~ 88%
Effluent turbidity ≤0.1 NTU, SS ≤1mg/L
Microbe interception rate ≥99.99%
Effluent meets GB/T 19923 industrial reclaimed water standard
Frame material: 304 stainless steel (standard), 316L stainless steel for corrosive biochemical wastewater
Control system: PLC + touch screen, differential pressure fouling alarm + enhanced CIP cleaning program
Backwash cycle: 10 ~ 40min adjustable
Chemical cleaning cycle: 1 ~ 4 months
Customized water production: 0.5T/h ~ 200T/h full tonnage for reclaimed water projects
All reclaimed water ultrafiltration equipment produced by LEFILIER implements whole-process quality tracking from anti-fouling membrane incoming inspection, steel structure processing, pipeline prefabrication to finished machine full-load water test. Each batch of reclaimed water special membrane elements must pass bubble point test and anti-fouling aging test to ensure stable interception effect under long-term biochemical wastewater scouring. All pipelines in contact with wastewater are subjected to pressure resistance test before assembly to prevent leakage under long-term high-flow operation.
Each finished reclaimed water ultrafiltration equipment must complete FAT full-load simulation reclaimed water test before delivery, detect water yield attenuation law, backwash flushing effect and cleaning response effect, and deliver goods with complete test reports after passing all items.
Our reclaimed water ultrafiltration equipment has ISO9001, CE, NSF61 certification. Under standardized operation and regular enhanced cleaning, the service life of PVDF anti-fouling membrane is 4–7 years. We provide long-term supply of special reclaimed water membrane spare parts and overseas remote technical commissioning guidance for all purchasing customers.
Factory production wastewater reuse: Treated reclaimed water is used for equipment cooling water, workshop floor flushing
Municipal sewage plant advanced treatment: Urban sewage after ultrafiltration is used for road washing, greening irrigation
Printing & dyeing factory wastewater recycling: Reduce sewage discharge and freshwater consumption of printing and dyeing enterprises
Electroplating wastewater depth treatment: Remove suspended hydroxide flocs to realize partial wastewater recycling
Food processing plant biochemical effluent reuse: Meet factory cleaning water demand after ultrafiltration treatment
Campus & residential community centralized sewage reuse: For landscape water replenishment and public sanitation flushing
Q1: What is the biggest difference between reclaimed water ultrafiltration equipment and ordinary raw water ultrafiltration equipment?
A: Reclaimed water ultrafiltration uses anti-fouling modified membrane, matches enhanced backwashing + strong chemical cleaning program, adopts larger cross-flow pipeline structure, and the overall design is more resistant to organic pollution and biological film attachment.
Q2: Can reclaimed water ultrafiltration equipment remove COD in biochemical wastewater?
A: It can intercept macromolecular COD and particulate COD, but soluble small-molecule COD cannot be removed. If the total COD index needs to be further reduced, it needs to be matched with advanced oxidation process.
Q3: How often does reclaimed water ultrafiltration equipment need chemical cleaning?
A: According to the pollution degree of biochemical effluent, the conventional period is 1 ~ 4 months, which is shorter than the cleaning cycle of ordinary clean water ultrafiltration equipment.
Q4: Can the reclaimed water treated by ultrafiltration equipment be directly used as drinking water?
A: No, ultrafiltration-treated reclaimed water is only suitable for miscellaneous water such as cooling, flushing and greening. To reach drinking water standard, further disinfection and deep purification processes are required.
Q5: Why is the design flux of reclaimed water ultrafiltration lower than conventional clean water ultrafiltration?
A: Appropriately reducing the operating flux can reduce the deposition speed of pollutants on the membrane surface, slow down membrane fouling, reduce cleaning frequency and extend the actual service life of the membrane element in long-term operation.
Q6: What pretreatment needs to be arranged before the inlet of reclaimed water ultrafiltration equipment?
A: It must be equipped with a secondary sedimentation tank + multi-media filter + 5μm security filter to intercept large suspended sludge particles and prevent hard particles from scratching the membrane surface.
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