Recovery of recycled
aggregates
Road Sweeping
Physicochemical treatment
of the wash water
Integrated tertiary treatment
for hydrocarbons and
other road contaminants
Water and sludge treatment plants for the recovery of aggregates from road sweeping
From light-fraction pre-treatment to tertiary treatment with activated carbon, Tecnoidea designs and builds complete water and sludge treatment plants for road-sweeping waste recovery, backed by 45 years of experience with complex waste streams.
A heterogeneous material requiring dedicated physicochemical treatment
Road-sweeping waste is particularly complex to treat. It is a heterogeneous mix of sand, gravel and traces of asphalt, contaminated by urban litter, floating organic fractions and chemical contaminants associated with road traffic and maintenance (hydrocarbons, mineral oils, brake dust and de-icing salts).
Road-sweeping water treatment must address three process challenges simultaneously: the physical separation of light fractions (litter, organics); the physicochemical treatment of the water (clariflocculation, chemical dosing) and sludge dewatering; and the removal of residual road contaminants (tertiary treatment with sand filters and activated carbon).
The Tecnoidea solution
The water and sludge treatment process in road-sweeping aggregate-recovery plants
Physical pre-treatment: removing floating fractions and light litter
The water from washing the road-sweeping material is laden with light fractions — microplastics, leaves and other organic matter, polystyrene and cigarette butts — which tend to accumulate at the surface during settling, interfering with sludge-floc settling and potentially causing problems for the clean-water lift pumps. Installing a static curved screen upstream of the water-treatment section lets the water pass through the screen, while organic matter and other light fractions are separated from the flow, protecting the downstream machinery.
Collection, chemical reaction and reagent dosing
An agitated reaction tank provides the contact time required for reagent mixing: coagulants, antifoam agents to control foaming caused by road surfactants, and pH correctors where required. Multiple dosing units can operate in parallel to manage the different chemical treatments.
Clariflocculation and dewatering
The conditioned water enters the static clarifier, where clariflocculation takes place. The LEM sludge-level monitoring system automates the discharge of the thickened sludge to the collection tank. From there it is pumped to the filter press, which compresses it into spadeable solid cakes, while the clarified water is returned to the closed-loop washing plant. Where the feed material is particularly clay-rich, chemical conditioning with milk of lime may be needed to improve the filterability of the sludge.
Tertiary treatment: sand filters and activated carbon filters
The wash water may contain hydrocarbons, oils and other road contaminants that are not fully removed by clarification. To manage this contamination — and to treat excess water before discharge — a tertiary treatment section may be required: sand filters to remove the residual suspended solids, followed by activated carbon filters for the adsorption of dissolved organic contaminants. If the plant includes lime dosing, the tertiary section may also include CO₂ neutralisation to correct the pH before discharge.
Products, plants and technologies for the road-sweeping sector
From the complete plant with a tertiary section to individual machines for revamping existing plants.
Disidratazione fanghi
La disidratazione meccanica rappresenta la fase più importante nella gestione dei fanghi di processo. Attraverso una filtrazione ad alta pressione,...
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Vaglio statico a griglia curva (Vaglio a Banana)
Unità indispensabile negli impianti di soil washing, spazzamento stradale e trattamento rifiuti da costruzione e demolizione, il vaglio statico a...
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Centralina pallettizzata dosaggio chimici (Serie CPDC)
La centralina pallettizzata Tecnoidea automatizza la preparazione e l’iniezione di reagenti chimici liquidi, come coagulanti, prodotti antischiuma, prodotti ossidanti e...
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Chiarificatore statico verticale
Il chiarificatore statico verticale è la tecnologia di riferimento privilegiata da Tecnoidea per separare i solidi sospesi dall’acqua di lavaggio....
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Processi terziari e sistemi accessori
Il completamento di un ciclo idrico chiuso e la massima resa di un impianto dipendono anche dall’efficienza dei processi terziari...
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Flocculazione
La flocculazione è il processo chimico-fisico essenziale per garantire l’efficienza del trattamento delle acque e, in particolare, la separazione solido-liquido....
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Overhead-beam filter press
The Tecnoidea overhead-beam filter press is designed for mechanical sludge dewatering in high-output applications. It separates the water from the...
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Single-chamber flocculant unit
A compact solution for low-flow-rate applications. The single-chamber unit is Tecnoidea’s solution for preparing and dosing flocculant in plants with...
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Sludge agitator
The sludge agitator is installed inside process tanks to keep the sludge homogeneous. It prevents the sludge from settling naturally,...
Discover the productSludge tank
Tecnoidea’s sludge tank is a dynamic process unit designed to receive thickened sludge from the clarifier and prepare it for...
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Contact usWhy Tecnoidea for road-sweeping aggregate-recovery plants
Specialist expertise
Since 1981 we have treated aggregate wash water and sludge. We operate an in-house analysis laboratory and provide chemical dosing units, LEM and SADF (automatic flocculant dosing) automation systems, and a complete range of products for road-sweeping wash-water and sludge treatment.
Process engineering
Road-sweeping and Soil Washing plants share a similar process architecture: static curved screen, reaction tank, clariflocculation, chemical conditioning, dewatering and tertiary treatment. The sizing changes, not the logic. This means our engineering team designs water and sludge treatment plants for road-sweeping material using the same process-engineering approach applied to environmental remediation projects.
Service and after-sales
A road-sweeping plant operates with materials that vary by season and by collection area, under regulatory constraints on water discharge. Our service is structured to support operational continuity: spare parts, scheduled maintenance and remote support.
45
Years of experiencein the physicochemical treatment of inert materials
17
Water and sludge treatment plantsfor road sweeping, designed and installed
References
Integrated dual-line water and sludge treatment plant
SwissSector Road Sweeping
Material treated Excavation and demolition aggregates
Amrein AG
A complete plant developed in response to new regulatory restrictions
Read the case study
Swiss
Sector Road Sweeping
Material treated Sweeping soil
Gloggner AG
The Modular Solution for Gloggner AG
Read the case study
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