Grit and Fat Removal

Grit Chambers

Minimise wear and increase operating reliability

For the operating safety and reliability of wastewater treatment plants, it is necessary to separate the grit transported with the wastewater and other mineral materials from the putrescible organic matter. For this purpose, grit chambers of various designs are used in practice. Depending on the type of grit trap, grease can also be separated in addition to grit.

The removal of grit from the wastewater serves to prevent operational troubles, such as grit sedimentation (in aeration tanks and digesters), increased wear (of pumps, stirrers) and clogging (of removal hoppers or pipelines). In addition, it is also used to reduce material wear of mechanical sludge treatment equipment (e.g. centrifuges, etc.). The aim is to separate as much as possible of the grit and inorganic material up to 0.20 mm grain diameter.

HUBER Grit Traps product categories

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Different types of HUBER Grit Chambers

Especially grit chambers such as the HUBER Grit Trap GritWolf® are capable of separating fine sand (“sugar sand”) of significantly smaller grain size with a high separation efficiency.

Due to the considerable organics content in the classified grit, longitudinal grit traps are nowadays additionally equipped with an aeration system. This partly prevents the organic matter from settling in the grit chamber and, at the same time, floating matter (grease) can be partly blown up by the injected air and retained in a separate grease trap.

Special grease removal systems remove the grease automatically and pass it on for further utilisation.

Different types of HUBER Grit Chambers are available for the separation of grit and grease from wastewater.

The grit separated in the grit chamber is usually freed from organic matter in a subsequent grit washing process.

Products

Product Groups for Grit and Fat Removal

Circular Grit Traps

Complete Plants

Grit Classifier

Lamella Grit Trap

Longitudinal Grit Trap

Case Studies

HUBER Solutions in Operation

Anaerobic Digestion Pre-treatment – A Grit Removal Case Study

Targeting the fine sand: Grit Trap GritWolf® passes first endurance test in Texas

New HUBER Grit Trap GritWolf® setting new standards: Grit removal below 100 µm

New grease separation and removal system in our Hydro Duct grit traps

Multifunctional Complete Plant installed on STP Ortenburg

Four HUBER VORMAX Vortex Grit Chambers in Saudi Arabia

Grit washing in grit trap: Complete Plant plus grit washing plant

Anaerobic Digestion: Twin HUBER grit traps and grit washers

Anaerobic Digestion Pre-treatment – A Grit Removal Case Study

A new Anaerobic Digestion plant outside Dublin has been provided with high efficiency HUBER grit removal and grit washing, to ensure trouble free operation and reduced downtime.

Test stand to determine the separation efficiency of the HUBER Grit Trap GritWolf® at 40°C in South Padre Island, TX

Targeting the fine sand: Grit Trap GritWolf® passes first endurance test in Texas

HUBER Grit Trap GritWolf® proves its efficiency in the separation of fine sand down to a grain size of 75 µm in a test run at South Padre Island in Texas.

HUBER Grit Trap GritWolf® – best grit and grease removal on a small footprint

New HUBER Grit Trap GritWolf® setting new standards: Grit removal below 100 µm

Fine grit of a grain size ≥ 75 µm can usually not be separated by conventional aerated longitudinal grit traps - The new HUBER Grit Trap GritWolf® here sets new standards.

New grease chamber with grease paddle in action

New grease separation and removal system in our Hydro Duct grit traps

Due to the new large grease trap system in our Hydro Duct type system the separation of dispersed coarse grease particles can be improved significantly. The grease trap system described above is implemented in all our HUBER Complete Plant ROTAMAT^® Ro5 HD units.

Multifunctional Complete Plant installed on STP Ortenburg

The new sewage treatment works at the city of Ortenburg is designed for 11,000 PE and provides state-of-the-art wastewater treatment.

Installation with a set of 4 VORMAX units

Four HUBER VORMAX Vortex Grit Chambers in Saudi Arabia

Four VORTEX grit trap plants, which we call VORMAX, were put into operation in Dharan, Saudi Arabia. The units are designed for a max flow of 876 l/s each and separate 90% of grit of 200 µm grain size

Grit washing in grit trap: Complete Plant plus grit washing plant

Complete Plants are complete systems for the mechanical treatment of small to medium amounts of wastewater from 10 to 300 l/s. Basically, a Complete Plant consists of two main components: screen and grit trap. As an option, other systems can be added, such as screenings treatment units, aeration systems or a grease trap.

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FAQ

Frequently Asked Questions

According to Kalbskopf, the design of aerated grit chambers is always based on the retention time of the wastewater in the grit chamber.

Unaerated grit chamber systems are always dimensioned according to the surface loading rate.

In addition to the desired sedimentation of grit, undesired separation of organic matter also occurs in the grit chamber. In order to prevent this separation of organic matter as far as possible, grit channels are designed with aeration to prevent the sedimentation of organic matter.

However, even aerated grit traps are unable to ensure reliable separation of grit from organics. This can only be achieved and guaranteed by a well performing grit washing plant, such as the HUBER Coanda Grit Washer RoSF4.

Depending on the type of grit trap, they separate the grit either by gravity (grit channels, lamellae separators) or centrifugal force (circular and vortex grit traps). Scraper blades or screw conveyors are often used to clear a grit channel. Solids removal in the further course of the process is effected by pump, grit classifier or integrated grit classifying screw. HUBER grit traps are available in many different designs.

The DWA Code of Practice M369 specifies an average amount of grit trap material of 60 l per 1000 m^³ of wastewater.

HUBER grit traps are usually dimensioned to have a grit separation efficiency of 95 % for a grain size ≥ 0.20 mm.

The HUBER Grit Trap GritWolf® is designed as a lamella grit trap and has a higher separation efficiency of 90% for grit particles ≥ 75 μm. This grit trap can also be used to separate fine and ultrafine sand ("sugar sand").