One-Step Wastewater Pretreatment! TNW Environmental – Original Manufacturer of Integrated Dissolved Air Flotation & Sedimentation Units

PRODUCT NEWS 2026-07-22

One-Step Wastewater Pretreatment! TNW Environmental – Original Manufacturer of I

One-Step Wastewater Pretreatment! TNW Environmental – Original Manufacturer of Integrated dissolved air flotation & Sedimentation Units

Environmental contractors and on-site wastewater operation staff are well aware of two major obstacles during wastewater system retrofits for small and medium-sized enterprises: limited space and tight budgets. Separate dissolved air flotation (DAF) and sedimentation tanks occupy extensive land, require complicated pipeline connection and push up civil engineering costs. Many low-cost makeshift integrated units from minor manufacturers suffer poor air dissolution efficiency and sludge accumulation in sediment zones. Suspended solids in effluent frequently exceed standards shortly after commissioning, triggering repeated environmental inspections.

An integrated DAF and sedimentation unit serves as an ideal pretreatment solution to simplify processes and save footprint. With years of experience manufacturing complete water treatment equipment, TNW Environmental independently develops and produces integrated DAF sedimentation systems. All functional modules including flocculation reaction, DAF separation, inclined tube sedimentation, scum skimming and sludge collection are consolidated inside a single tank. Pre-assembled and commissioned before delivery, the unit is widely preferred by contractors and manufacturers for new wastewater projects and retrofits of aging sewage facilities.

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1. Integrated Compact Structure Saves Land and Cuts Civil Works

Traditional treatment sequence: Equalization tank → flocculation tank → independent DAF → inclined tube sedimentation tank. Discrete equipment requires tangled pipelines and demands large space rarely available for small and medium factories.

TNW optimizes internal layout of integrated units, dividing the tank into dedicated zones: flocculation reaction chamber, air release area, DAF separation zone, inclined tube sedimentation zone and sludge thickening zone. Wastewater sequentially undergoes coagulation, oil & suspended solid removal via microbubbles, and advanced sedimentation inside the tank without multiple independent structures.

Adopting skid-mounted integrated design, the unit can be put into operation immediately after hoisting, water, power and chemical pipeline connection. It perfectly suits space-restricted old factories, small township sewage stations and workshops, greatly shortening construction cycles and lowering civil investment.

2. Dual Separation Technology: Combined DAF and Sedimentation Delivers Stable Effluent

Many low-cost integrated products merely mechanically combine DAF and sedimentation sections, resulting in water short-circuiting and massive bubble loss that weakens treatment performance. TNW optimizes internal flow paths to eliminate dead zones and short flow.

High-efficiency air dissolving system for rapid removal of floating oil and light flocs
Equipped with thickened stainless steel air dissolving tanks and anti-clog stainless steel releasers to generate fine microbubbles. Oil, emulsified grease and light flocs adhere to bubbles and rise to form scum. An automatic top-mounted scraper continuously collects scum to eliminate animal & vegetable oil and fibrous contaminants.
Inclined tube sedimentation for deep capture of fine precipitates
Water treated by DAF flows downward into the sedimentation zone. Heavy sediment such as sand and inorganic particles settles into bottom sludge hoppers for dual interception of suspended solids. The combination strengthens resistance against fluctuating water quality and traps fine particles hard to remove by DAF alone.
Multiple sludge hoppers are arranged at the tank bottom. Sludge accumulates by gravity and is discharged through dedicated pipelines to reduce manual cleaning frequency.

3. Customizable Materials for Neutral, Saline, Acidic and Alkaline Wastewater

Wastewater corrosivity varies across industries. Uniform low-cost carbon steel tanks easily suffer rust and leakage. TNW provides multiple material options based on water quality to balance budget and service life:

Epoxy-coated carbon steel version: Cost-effective for municipal domestic sewage and neutral food processing wastewater, suitable for budget-limited projects.
Standard full 304 stainless steel version: Widely adopted for printing, machining and catering wastewater with reliable corrosion resistance and low leakage risk during long-term operation.
Premium 316L stainless steel anti-corrosion model: Designed for chemical pickling, electroplating and coastal high-salinity facilities to resist chloride, acid and alkali erosion for heavily corrosive industrial wastewater.

Tank thermal insulation and pipeline heat tracing are optional for cold northern regions to prevent liquid freezing and sludge hardening in winter.

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4. Automatic Electrical Control Supports Unattended Operation with Complete Equipment Linkage

Most small and medium sewage facilities lack sufficient full-time operators. TNW integrated DAF sedimentation units are equipped with standard PLC frequency conversion control systems, capable of interconnecting with TNW powder dosing units, fine screens and screw presses.

The system automatically adjusts chemical dosage together with dosing equipment to cope with fluctuations in inlet flow and turbidity. The scum scraper and air dissolving pump can operate on preset cycles. Acoustic-visual alarms and auto shutdown activate upon overload and water shortage to protect pumps.

Scum and settled sludge are collected centrally and can be directly transferred to screw presses for dewatering, forming a closed-loop process and simplifying sludge transportation.

5. Wide Application for Pretreatment of Diverse Industrial Wastewater

Thanks to integrated advantages, integrated DAF sedimentation units are increasingly adopted for small and medium wastewater projects:

Wastewater from food, slaughter and prefabricated food plants: Removal of grease, meat residues and organic suspended solids.
Printing, papermaking and chemical fiber wastewater: Decolorization and fiber interception to reduce COD.
Machining and hardware cleaning wastewater: Treatment of cutting fluid, emulsified oil and metal debris.
Small township integrated sewage stations, farmhouses and catering cluster domestic wastewater.
Emergency river regulation and landscape water purification for algae and floating contaminant removal.

Many general contractors procure complete sets including screens, dosing equipment, integrated DAF sedimentation units and screw presses. All devices are pre-calibrated for linkage at the factory, simplifying on-site connection and accelerating project acceptance.

6. Direct Supply from Original Manufacturer to Avoid Risks of Assembled Units

Numerous integrated DAF sedimentation units on the market are simply assembled by small workshops with externally purchased tanks and fittings. Poorly designed internal flow channels and absent hydraulic testing lead to sludge accumulation and unstable effluent, with unreliable after-sales support.

TNW operates complete production lines for sheet metal processing, tank welding and unit assembly. Every unit undergoes water commissioning before delivery to verify air dissolution effect, flow conditions and tank tightness for risk elimination.

Transparent quotations with clear specifications of tank material, air dissolving pumps, inclined tubes and electrical configurations. No hidden surcharges after low bare-unit marketing.
Non-standard dimensional customization available; tank specifications adjustable according to workshop space and treatment capacity.
Free lab testing after receiving customer wastewater samples, together with matched chemical dosing recommendations.
Nationwide after-sales service network. Core pumps and control systems enjoy a 12-month warranty; genuine spare parts are continuously supplied at factory cost.

Practical Selection Guidance

Prioritize air dissolving system configuration for oily wastewater with abundant light flocs; simple plastic releasers are prone to clogging.
Stainless steel tanks are recommended for coastal sites and chemical acid/alkali wastewater. Carbon steel tanks incur high maintenance costs from corrosion and leakage over long immersion.
Skid-mounted integrated units are preferred for space-constrained renovation projects to minimize civil engineering work.
Equip downstream screw presses for projects generating large sludge volume for timely dewatering and avoid sludge fermentation and floating inside tanks.
Select fully automatic control versions for 24-hour continuous operation to reduce daily labor and maintenance workload.

Conclusion

For small and medium wastewater treatment projects, integrated DAF sedimentation units overcome drawbacks of discrete equipment including large footprint, complicated construction and tangled pipelines. Combined DAF and sedimentation achieves dual purification for more stable pretreatment effluent. Pursuing ultra-low-cost assembled units often leads to frequent pipe blockage, sludge buildup and substandard discharge, bringing unexpected rectification and operation expenses.

As a professional original manufacturer of integrated DAF sedimentation equipment, TNW Environmental provides mature internal flow channel design, multi-grade anti-corrosion options and automatic control systems. It delivers cost-effective solutions for new small and medium wastewater projects and retrofits of separated DAF and sedimentation facilities.

Share your daily treatment capacity, wastewater type and workshop dimensions, and TNW technical team will provide customized configuration proposals and detailed factory quotations free of charge.

Leave us a message to obtain a quotation.

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