Waste from the integrated water system
In the Water Segment, production of waste largely corresponds with the production of sludge from the treatment process, with a minimal portion from sand and screens used in the same process. The former is essentially composed of water, biomass and a portion of chemical substances used for conditioning during drying, which helps to reduce the volumes of waste outputs. Sand and screens derive from pre-treatment of wastewater and contain plastic, aggregates and paper materials. The remainder is composed of residual material from cleaning to maintain systems. This may include sludge from regeneration of cation-exchange resins. Chart no. 60 shows an example of waste streams for the water sector.
Chart no. 60 – Waste streams for the Water Segment companies
Table no. 70 – Waste produced by companies in the Water segment (2019-2021)
|water segment waste (t)||2019||2020||2021|
|of which sludge, sand and screens||143.316||138.756||166.969|
|detail by type of processing|
|entirely recovered waste||54.992||63.570||110.019|
|of which sludge, sand and screens for recovery (*)||53.283||59.884||108.620|
|entirely disposed of waste (*)||98.473||88.715||66.419|
|of which sludge, sand and screens for disposal (**)||90.033||78.872||58.349|
|landfill and other disposal operations||84.442||69.296||58.215|
(*) In 2021, 102,760 t of sludge and 5,860 t of sand and screens were sent for recovery.
(**) In 2021, the following was sent for disposal: 50,031 t of sludge and 8,318 t of sand and screens.
Aquaser acts as a broker for certain Group water companies (Acea Ato 2, Acea Ato 5 and AdF), carrying out the pick-up, transport and recovery/disposal of waste (solid and liquid), with identification of final-destination sites for special waste with regard to solid materials, and providing logistical services (pick-up, transport and discharge) for liquid waste that is handed over to authorised plants.