Grit & Water Separator
The grit chamber intercepts inorganic particles such as sand and stone chips from the influent, but what is discharged is often a "grit-water mixture"—if transported directly, it has high moisture content, large volume, and is prone to putrefaction and odor due to entrained organic matter. The Grit & Water Separator is designed specifically for this purpose, efficiently separating the grit-water mixture discharged from the grit chamber into clean, low-moisture grit and reusable clear water, making the grit discharge process clean, reduced in volume, and odor-free.
I. Product Positioning
The Grit & Water Separator is auxiliary equipment for the pretreatment grit removal system in wastewater treatment, used for secondary separation of the grit-water mixture discharged from aerated grit chambers, vortex grit chambers, etc. It is commonly available in two types: spiral type (shaftless spiral lifting) and hydrocyclone type (hydraulic cyclone centrifugal sedimentation). After the grit-water mixture enters the separation tank, the heavier inorganic grit settles to the bottom and is pushed/lifted by the spiral (or centrifugal force) to the grit discharge outlet for dewatering and discharge; clear water overflows from the upper overflow outlet and returns to the front end of the treatment system. The main body is mostly made of 304 / 316L stainless steel or anti-corrosion carbon steel, resistant to corrosion and capable of continuous operation, making it a key component of the "grit removal closed loop" in wastewater treatment plants.
II. Working Principle (Text Steps)
Grit-water inflow: The grit-water mixture discharged from the grit chamber (aerated/vortex grit chamber) enters the separator tank through the inlet.
Settling separation: The mixture decelerates in the tank, and the heavier inorganic grit settles to the bottom (the vortex type accelerates settling by centrifugal force).
Spiral lifting and grit transport: In the spiral type, a shaftless spiral pushes the settled grit upward along the inclined tank; in the vortex type, grit sinks along the cone to the bottom grit discharge outlet.
Dewatering and draining: During lifting/transport, the grit drains water by gravity, and surface-attached water and entrained organic matter fall back with the water, achieving further grit-water separation.
Clear water overflow: The separated clear water is discharged from the upper overflow outlet and returns to the front end of the grit chamber or the screen well, without wasting water volume.
Continuous grit discharge: Clean, low-moisture grit is continuously discharged from the grit discharge outlet, received for external transport or sent to a grit storage bin, with the entire process operating automatically and continuously.
Process description: The core is "grit settling + lifting dewatering + water return," making grit discharge clean, low-water, and low-organic, belonging to a different separation stage than inclined screens (coarse solid-liquid screening) and microfiltration (surface fine filtration).
III. Core Advantages
Clean grit discharge with low moisture content Spiral lifting dewatering achieves grit moisture content below 60%, reducing volume and facilitating external transport.
Organic removal and odor prevention The separation process washes off entrained organic matter, reducing organic content in the grit and preventing odor during long-term storage.
Continuous automatic operation Interlocked with the grit chamber, it automatically feeds, separates, and discharges grit without dedicated supervision.
Compact structure with small footprint Integrated tank design allows direct installation beside the grit chamber or on the grit-water channel, offering flexible layout.
Shaftless spiral resists clogging The spiral type uses a shaftless spiral, highly adaptable to grit-containing and fiber-containing materials, not easily jammed.
Corrosion-resistant and long-lasting Stainless steel/anti-corrosion carbon steel materials remain stable and durable under long-term contact with grit-water mixture.
IV. Main Technical Parameters (Typical Range Reference)
Item | Typical Range (depending on grit volume and model) |
|---|---|
Equipment type | Spiral type (shaftless spiral lifting) / Hydrocyclone type (hydraulic cyclone centrifugal) |
Treatment capacity | Approx. 5–40 m³/h (grit-water mixture) |
Separation particle size | Inorganic grit ≥0.2 mm can be effectively separated |
Spiral diameter | Approx. 150–300 mm (spiral type) |
Grit moisture content | <60% (after spiral dewatering) |
Organic content in grit | Significantly lower than grit directly entering the grit chamber, facilitating subsequent disposal |
Installed power | Approx. 0.37–1.5 kW |
Overflow return water | Returns to the front end of the grit chamber / screen well, no water loss |
Main body material | 304 / 316L stainless steel or anti-corrosion carbon steel |
Note: The above are typical range references. Actual treatment capacity and grit discharge indicators must be determined based on the grit discharge volume of the grit chamber, grit particle size, and grit concentration.
V. Typical Application Scenarios
Scenario | Description |
|---|---|
Municipal wastewater treatment plants | Secondary grit-water separation and dewatering of grit discharged from aerated grit chambers and vortex grit chambers. |
Industrial wastewater pretreatment | Supporting separation in grit removal stages of industrial wastewater with high grit content. |
Water intake / pumping stations | Grit removal and grit-water separation at water source intakes and lift pumping stations. |
Stormwater pumping stations / combined systems | Grit-water separation after grit removal from high-grit stormwater runoff during rainy seasons. |
Food / slaughterhouse wastewater | Pretreatment grit removal and separation for wastewater containing inorganic grit and debris. |
River / black-odor water body treatment | Efficient separation of sediment grit-water in dredging and bypass treatment. |
Grit material recovery | Processes requiring recovery of clean grit resources for use as aggregate or backfill. |
VI. Applicable Boundaries and Selection Recommendations
Applicable boundaries: The Grit & Water Separator is specifically designed for inorganic grit-water mixture discharged from grit chambers, skilled at separating and dewatering inorganic particles ≥0.2 mm; it is ineffective for dissolved substances, colloids, and organic suspended solids, and does not perform the main wastewater treatment function—it is the "finishing" equipment of the grit removal system.
Selection recommendations: ① For small to medium water volumes requiring clean grit discharge, prioritize the spiral type (shaftless spiral); ② For large water volumes with limited space, evaluate the hydrocyclone type; ③ The grit concentration in the influent should be stable—too low affects separation, too high requires increased capacity; ④ Spiral blades and tank body are wear parts, should be selected as 304 / 316L based on medium corrosiveness with spare parts reserved; ⑤ The overflow return outlet should be connected back to the front end to avoid loss of water volume and pollutants; ⑥ Grit discharge should be equipped with a grit storage bin or receiving truck for clean external transport.
Make the grit settling and discharge process clean and reduced in volume
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FAQ
How much does this equipment cost?
The price varies by treatment capacity, water quality, materials and configuration, so a custom quote is provided based on your actual conditions. We offer free water testing and solution design, with a detailed quote within 1 working day after requirements are confirmed.
What treatment capacity is available? Can it be customized?
Capacity is fully customizable, ranging from tens to thousands of tons per day (e.g. 0.5–30 m³/h), with non-standard design support matched precisely to your inlet/outlet requirements.
How long does delivery take?
Standard equipment typically takes about 2–4 weeks to produce; custom projects depend on scale and process. The delivery date is confirmed at contract signing, with design, manufacturing and shipping progressing on schedule.
Is installation and commissioning included?
Yes. We provide installation, system commissioning, operator training and environmental acceptance assistance, as well as long-term managed operation services on request.
What about after-sales and warranty?
We provide a warranty period and a 24/7 technical hotline, with free repair for non-human faults during the warranty period, plus spare parts supply and regular inspection services.
Make the grit settling and discharge process clean and reduced in volume
Rihong Environmental provides selection and supporting services for Grit & Water Separators and overall layout solutions for grit removal systems. Tell us your grit chamber type, grit discharge volume, and grit characteristics, and we will match you with the appropriate spiral or hydrocyclone model.
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