Waste Water Treatment

Activated sludge treatment plants or “total oxidation plants” are used for residential communities not connected to the public sewer lines system. Depurative process is of a biologic type, and it is based on the action of aerobic bacteria, which feed themselves with the organic substance contained in the inlet sewages. Activated sludge treatment plants are split into an oxidation zone and a sedimentation one, where bigger micro-organisms’ aggregates separate from outlet water flux.

These plants may be supplied with pre or post treatments which allow to improve the overall depurative effectiveness, according with the type of the sewage discharged and with the particular features of the final address.

Activated sludge treatment plants are particularly appropriate for small and medium communities, since they allow the following advantages:

• Simplification of the treatment type, with consequent reduction of the number of plant’s structural elements and therefore reduction of the necessary investment
• Achievement of a very high depurative standard and good constancy of the features of the effluent
• Production of a minimal quantity of high biological stability excess sludge
• Ease of management and maintenance
• Low electrical consumptions

SUPER PLUS

SUPER PLUS is a package plant entirely made of a single piece of roto-moulded polyethylene. The plant is designed for the secondary treatment of domestic waste waters from small residential communities not served by the main sewer.

SUPER PLUS is generally associated with a grease trap for pre-treatment of gray water discharged from kitchen, showers and domestic laundry equipment or a Double-Septic tank in situation where black and gray waters are mixed.

Secondary treatment is designed to substantially degrade the biological content of the sewage. SUPER PLUS is a compact activated sludge plant to treat the settled sewage liquor using aerobic biological processes. The depuration is performed in a multi-stage process whose phases of: biological oxidation, sedimentation, digestion and disinfection.

Sedimentation
Sedimentation is the final step in the secondary treatment stage with the objective to settle out the biological floc and produce a supernatant with very low levels of organic material and suspended solids.
SUPER PLUS has a sedimentation compartment designed to optimize the hydraulic retention for a time suitable to allow the sludge settlement.
The activated sludge and the solids settle to the base of the plant while the clarified supernatant liquid flows towards the final stage of it.

Digestion
The sludge separated from the treated effluent is already partially stabilized.
The biological process is designed to minimize the quantity of sludge which needs to be removed periodically from the system for separate disposal in designated pits.

Chlorination
Clarified water is discharged through a contact compartment where an active chlorine tablet is positioned to disinfect and remove any remaining pathogens from the water.

COMPACT

COMPACT is a package plant entirely made of a single piece of roto-moulded polyethylene. The plant is designed for the secondary treatment of domestic waste waters from small residential communities not served by the main sewer.

COMPACT is generally associated with a grease trap for pre-treatment of gray water discharged from kitchen, showers and domestic laundry equipment or a Double-Septic tank in situation where black and gray waters are mixed.

Digestion
The sludge separated from the treated effluent is already partially stabilized.
The biological process is designed to minimize the quantity of sl?udge which needs to be removed periodically from the system for separate disposal in designated pits.

Chlorination
Clarified water is discharged through a contact compartment where an active chlorine tablet is positioned to disinfect and remove any remaining pathogens from the water.

POLI 1

POLI 1 is a package plant designed for the secondary treatment of domestic waste waters from residential communities not served by the main sanitary sewer.

POLI 1 is generally associated with a Grease Trap for pre-treatment of gray water discharged from kitchen, showers and domestic laundry equipment or a Double-Septic tank in situation where black and gray waters are mixed.

This secondary treatment plant is based on a traditional activated sludge process. The tanks are made of monobloc high density roto-moulded polyethylene and the process is divided in two distinct phases: the biological oxidation phase performed into a horizontal HDPE tank of cylindrical shape and a settling phase performed into a vertical HDPE tank with the traditional conical shape base to facilitate the sedimentation.

Oxidation
The biological oxidation phase occurs in presence of aerobic bacteria and protozoa which consume biodegradable soluble organic contaminants and bind much of the less soluble fractions into floc particles.
The oxygen necessary to the biological processes is supplied by a silenced membrane-type air compressor positioned externally.
Oxygen is diffused inside the oxidation compartment by means of EPDM non-clogging membrane diffuser, delivering fine bubbles. The operation of the air-blower can be timed and regulated in relation to the organic load.
From the aeration tanks water flows to the settlement area. Sedimentation is the final step in the secondary treatment process with the objective to settle out the biological floc and produce a supernatant with very low levels of organic material and suspended solids.

Sedimentation
Activated sludge from the settlement area is recycled back to oxidation area through an air-lift device, operated by an air-blower. The quantity of sludge recycled is adjusted by means of regulation valves, through which is possible to remove periodically the excessive quantity.