Hydro MicroScreen
Industrial water treatment

Hydro MicroScreen

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Drastically reduce the cost, footprint and energy consumption for industrial and municipal wastewater and process water treatment.

The Hydro MicroScreen™ is a low-energy, small-footprint rotating belt screen that delivers exceptional solids removal from process water and wastewater.

Maintaining efficiency even at peak design flow rates, it enables operators to meet discharge requirements, increase efficiency and save money.

The Hydro MicroScreen™ is a low-energy, small-footprint rotating belt screen that delivers exceptional solids removal from industry process water and wastewater

Maintaining efficiency even at peak design flow rates, it enables industrial and municipal operators to meet discharge requirements, increase efficiency and save money by cutting energy and chemical use, lowering maintenance costs, reducing solids handling and recovering materials to be recycled and reused, converted into energy or sold on into onward markets.


Hydro MicroScreen™ can help a wide range of industries to improve efficiency and cut pollution:

Only Hydro MicroScreen™

  • Reduces energy requirements by up to 50% and footprint by up to 90%
  • Incorporates patented design features to enhance flow treatment and dewatering performance
  • Is designed to exacting OSHA standards to ensure safe, reliable operation

Try the ROI Calculator

If you're based in the UK, use our Mogden formula ROI calculator to see how much you could save on trade effluent surcharges. 

Reduce energy use and footprint

The Hydro MicroScreen™ is a low-energy, small-footprint system, providing economical treatment in a small space. With a footprint of between 4 and 10 m2 (43 and 107 sq ft) and an energy demand of between 2.5 and 7.0 hp. It saves up to 50% on energy use and up to 90% on footprint compared to conventional primary treatment technologies.

Cut maintenance costs and system downtime

Maintenance of a conventional primary clarifier is a costly, lengthy and hazardous process. By contrast the Hydro MicroScreen™ is a small and  accessible unit that can be cleaned and maintained quickly and easily – minimizing maintenance costs and reducing costly system downtime. A two-unit system provides dual redundancy, eliminating system downtime during maintenance altogether. By reducing the load placed on downstream systems and processes it also prolongs downstream equipment lifetimes and reduces the downstream maintenance burden.

Turn waste into a commodity

Hydro MicroScreen™ screens and captures industrial process material and by-products at high removal rates. This captured material may then either be returned to the process chain, cutting waste and increasing operational efficiency, or used to offset costs by converting it into energy or selling it on to secondary markets. 

Save on solids handling

With dewatering section and compression zone, Hydro MicroScreen™ produces up to 50% total solids without the use of chemicals. This increases the efficiency of solids handling, cutting the cost of transport and disposal.

Protect downstream treatment systems

The Hydro MicroScreen™ does not require equalization prior to screening, and will reduce the TSS and particulate BOD going into a Dissolved Air Flotation (DAF) system - reducing the load to help achieve better overall performance. In a new DAF installations a Hydro MicroScreen™ can reduce the size / capacity of the DAF system required.

Capture more solids

Wedgewire drum screens are typically offered in sizes that range from 250 – 1500 micron openings.  This means they will miss the materials that are smaller than that.  The Hydro MicroScreen™ can be sized to capture particles as small as 100 micron and larger. Finer solids are the most difficult to deal with and can contribute to a large portion of the total solids loading.

Additionally, drum screens require a separate compaction / dewatering system.  Compared to drum screens, the Hydro MicroScreen™ provides significantly better performance in TSS and BOD removal, uses less wash water, and does not require a separate compaction system.

Cut your sedimentation / clarification footprint

In addition to materials recovery and solids removal, the Hydro MicroScreen™ offers numerous benefits compared to conventional settling / sedimentation systems:

  • Uses just 15-30% of the energy
  • Provides superior solids dewatering
  • Reduces overall solids handling costs
  • Requires as little as 10% of the overall footprint
  • Reduces retention time
  • Increases plant capacity
  • Often does not require chemicals
  • Capital construction costs are just 20-30% of a conventional settling system

Flow enters (either pumped or via gravity) and hits an energy dissipation plate and flow diverter. The diverter evenly distributes the influent over the entire width of the screen.

As solids build up on the screen they create a mat, which causes the water level in the influent cavity to rise. An ultrasonic sensor allows liquid level monitoring of the influent cavity.

Once the water level reaches a programmed set point the screen begins to rotate upwards and screening begins. Depending on the inlet solids loading and volume of water the screen automatically adjusts from 0 to 21 rpm. As the screen rotates, solids are lifted out of the influent cavity while the cleaned screen is reintroduced at the bottom of the inlet cavity.

The collected solids are conveyed to the dewatering section for further compaction - the Hydro MicroScreen™ produces up to 50% dry solids when fitted with a dewatering section and compression zone - which is isolated to protect the screen and lower roller from settled debris.

Cleaning the mat off the screen is simple: most of the material falls into the dewatering auger section by gravity, while any remaining solids or grease are removed by internal wash water at 550-689 kPa (80-100 psi), which is followed by a scraper blade.

Removal rates 

  • TSS (Total Suspended Solids): up to 70%
  • BOD (Biological Oxygen Demand): up to 40%
  • FOG (Fat, Oil & Grease): up to 40%
  • Phosphorus: up to 10%

Technical characteristics

  • Maximum hydraulic capacity, industrial applications: 138 l/s2,200 gpm*
  • Maximum hydraulic capacity, municipal applications: 110 l/s / 1,750 gpm*
  • Power consumption (hp): 2.5-7.0
  • Estimated power consumption (kWh/day)**: 30-88

* Capacity is based on a 200 μm screen, and will vary based on screen opening and incoming solids loads (TSS)

** Estimated energy consumption based on 24-hour continuous operation at 70% duty cycle

  • Hydro MicroScreen in warehouse
  • Hydro MicroScreen recycling and reuse process materials
  • Hydro MicroScreen installed
  • Hydro MicroScreen processing carrot wastewater
  • Hydro MicroScreen dewatering
  • Hydro MicroScreen dewatering section close up
  • Hydro MicroScreen rotating belt screen

Can removed solids be used for waste to energy?


Yes – the energy value of solids removed is equivalent to wood chips at 3,800 kJ/kg (8,000 BTU/lb) dry basis, and the high ratio of volatile solids to fixed carbon indicates good reactivity in thermal processes.


What are the expected operational cost savings?


At one municipal wastewater treatment plant with an average flow of 126 m3/h (0.8 MGD) and influent BOD and TSS of 250 mg/L, reductions in the cost of electricity, sludge hauling and disposal, operational and maintenance labor, estimated operational cost savings resulting from the installation of one Hydro MicroScreen™ amounted to over £26,000 ($38,000) per annum.


How effective is the Hydro MicroScreen™ for municipal applications?


An operational testing program at more than a dozen US wastewater treatment plants demonstrated effective TSS removal at over 80% on average, and BOD removal at over 55% on average.


How effective is the Hydro MicroScreen™ for industrial applications?


Operational testing at industrial facilities including food processors, wineries and tanneries demonstrates that the Hydro MicroScreen™ removes TSS, VSS, BOD, COD and FOG effectively. TSS removal rates of over 90% were observed, with removal rates at over 75% for BOD/COD, 90% for FOG and 50% for VSS.

Parts & Spares

Keep your Hydro International water management systems running effectively and efficiently. Our services teams will supply you with…

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