Product Introduction

Linzhen DAF (Dissolved Air Flotation) equipment is a core solid-liquid & oil-water separation wastewater treatment device independently developed and manufactured by Qingdao Linzhen Environmental Engineering Co., Ltd. Different from traditional sedimentation equipment, this DAF unit relies on micron-level microbubble adhesion technology to rapidly capture light flocs, oil droplets, colloids and suspended solids that are hard to settle by gravity.

Our factory has upgraded the saturated air dissolving pipeline and pressure release nozzle structure, solving common pain points of conventional DAF such as insufficient microbubble output, uneven water distribution and low pollutant interception efficiency. The whole set integrates chemical dosing tank, air dissolving tank, flotation separation tank, automatic slag scraper and PLC intelligent control cabinet as one skid-mounted unit, supporting on-site direct installation without complex civil matching.

This DAF series covers small laboratory models (3m³/h) to large industrial customized models (1000m³/h). It can remove over 95% TSS, 98% oil & grease, and reduce COD/BOD by 35%-80%, perfectly matching pretreatment, intermediate purification and sludge thickening links of industrial wastewater projects, and fully meet local wastewater discharge and water reuse standards of Southeast Asia, Middle East, Europe and America.

Working Principle

Wastewater Conditioning: Raw wastewater is mixed with coagulant (PAC) and flocculant (PAM) in the reaction tank, tiny pollutants aggregate into large dense flocs.
Recycle Water Pressurization: 15%-40% of clean treated water is extracted as recycle stream, pumped into the pressure air dissolving tank together with compressed air.
Air Saturation: Under stable 4-6bar pressure, air fully dissolves into recycle water to form saturated whitewater solution.
Microbubble Precipitation: Saturated whitewater is released into the main flotation tank through customized pressure relief nozzles; pressure instantly drops to atmospheric pressure, and dissolved air precipitates into 30-60μm uniform microbubbles.
Buoyancy Separation: Microbubbles tightly adhere to pollutant flocs and oil droplets, lowering the overall density of impurities below water density, so pollutants quickly float upward to form thick scum layer on water surface.
Automatic Slag Removal & Water Output: The motor-driven surface skimmer scrapes floating sludge into the sludge hopper for follow-up dewatering; clear treated water flows out from the bottom overflow port to the next water treatment process.

Core Advantages of Linzhen DAF

Self-Developed High-Efficiency Air Dissolving System

Patent optimized spiral air dissolving tank, air dissolution efficiency increased by 32% compared with ordinary DAF; microbubbles are finer and more uniform, greatly improving pollutant adhesion capacity, avoiding incomplete flotation and turbid effluent.

Corrosion-Resistant Customizable Tank Material

Optional SS304, SS316L epoxy anti-rust carbon steel, polypropylene plastic tank body; SS316L version specially designed for high-salinity, acidic wastewater in Saudi Arabia, Indonesia and other coastal areas, service life over 15 years.

Full-Automatic Intelligent Control System

Standard equipped PLC control cabinet, supporting automatic chemical dosing, timing slag scraping, flow real-time monitoring, fault alarm; remote online monitoring optional, one person can manage multiple DAF units, save labor cost.

Ultra-Low Operation & Maintenance Cost

Low recycle ratio design reduces pump power consumption; detachable pressure relief nozzle, easy disassembly and cleaning without tank drainage; wearing parts supply sufficient, factory direct supply with 1-year free replacement warranty.

Modular Skid-Mounted Integrated Design

All pipelines, pumps, dosing tanks pre-installed in factory, only pipeline connection needed after arriving at customer site; support container-type overall delivery for overseas remote projects, shorten installation period by 60%.

Global Project Customization Capacity

Engineers independently design flow rate, pressure, tank volume according to customer raw water TDS, oil concentration, daily water volume; compatible with matching RO, MBR, EDI water treatment process lines for pharmaceutical, food purified water supporting pretreatment.

Technical Parameter Table

Wide Industry Application

Food & Beverage Industry: Dairy wastewater, slaughterhouse sewage, fruit & vegetable processing wastewater, edible oil factory wastewater, effectively remove food grease and protein suspended matter.
Printing & Dyeing Textile Industry: Remove printing ink, dye colloids, textile fiber suspended solids, reduce chroma and COD of printing wastewater.
Chemical & Petrochemical Factory: Separate mineral oil, chemical emulsified oil, organic colloids in chemical production wastewater.
Pharmaceutical Water Treatment: Pretreatment of pharmaceutical production wastewater, intercept biological residues, medicinal oil, protect subsequent RO membrane from contamination.
Mechanical Processing & Auto Repair: Metal cutting fluid wastewater, car washing wastewater, remove lubricating oil and metal fine powder.

Global Qualifications & Certifications

All Linzhen DAF series equipment pass full international standard testing, supporting overseas customs clearance and local environmental inspection:
ISO9001 International Quality Management System Certificate
ISO45001 Occupational Health Safety System Certificate
CE EU Equipment Safety Certification (Mandatory for EU Market)

Manufacturing Excellence Backed by Engineering Expertise

Linzhen is headquartered in Huangdao District, Qingdao, Shandong, China. As a comprehensive environmental protection company, we integrate R&D, manufacturing, engineering design, and global export services to deliver reliable water treatment solutions for customers worldwide.

Our manufacturing facility covers 13,200 m² and is supported by a team of 78 skilled professionals, enabling efficient production, strict quality control, and dependable project delivery.

Advanced R&D and Manufacturing Capabilities

Innovation is at the core of our business. Linzhen operates an independent Water Treatment R&D Laboratory staffed by six senior water treatment engineers, each with more than 10 years of experience in industrial wastewater treatment system design and process optimization.

Our modern production facility is equipped with a complete range of manufacturing equipment, including:

Precision laser cutting machines
CNC bending equipment
Automated welding systems
Anti-corrosion coating workshop
Finished product testing platforms

This integrated manufacturing capability allows us to maintain consistent product quality, improve production efficiency, and ensure every system meets demanding industrial standards.

Proven Global Export Experience

Linzhen has successfully supplied environmental treatment equipment and engineering solutions to customers in more than 30 countries, including Saudi Arabia, Pakistan, Malaysia, Indonesia, Germany, Australia, and Mexico, establishing long-term partnerships with clients across global markets.

As a Gold Supplier on Alibaba International, we maintain a 5.0 store rating and have consistently achieved a 100% on-time delivery rate, reflecting our commitment to product quality, reliable lead times, and exceptional customer service.

Faq

Q1: What wastewater scenarios are DAF units most suitable for?
A: DAF is the optimal choice for wastewater containing light oil, emulsified oil, fine suspended flocs and colloidal impurities.not recommended for wastewater containing a large amount of heavy sand and large granular sediment (need pre-sedimentation tank as pretreatment).

Q2: How to choose the correct DAF model flow capacity?
A: Confirm two core data first: daily total wastewater discharge hours and hourly maximum water volume. We suggest reserve 10%-20% surplus flow to cope with peak water volume; send your raw water test report (TSS, oil concentration, pH, COD) to our engineer, we will provide free model selection calculation and customized scheme within 24 hours.

Q3: Which tank material should I select for coastal high-salinity wastewater?
A: For coastal, marine, acidic wastewater, SS316L stainless steel tank is recommended with strong chloride ion corrosion resistance; general factory neutral oily wastewater can select cost-effective SS304; low-budget domestic non-corrosive sewage can choose epoxy anti-rust carbon steel.

Q4: What’s your delivery cycle for standard DAF models?
A: Standard small and medium DAF models (3-100m³/h) have stock raw materials, delivery within 20 working days; customized large flow DAF or special material anti-corrosion models take 30-45 working days; we can arrange priority production for urgent overseas orders.

Q5: Do you provide overseas installation and commissioning service?
A: Two service modes available: 1) Free English video remote guidance, send detailed installation drawings and operation manual; 2) Arrange professional water treatment engineers to your factory for door-to-door installation, commissioning and staff operation training (customer bears round-trip airfare and accommodation cost).