You have asked a generalized question as so many do here. Without knowing the application the RO is used for; or more specifically what is in the concentrate and at what levels, how can anyone give an answer. If it is just average ground or surface water, then there are no special requirements (these would be concentrated mineral/metallic salts) as if the water had evaporated. But if you are targeting certain contaminants, such as Arsenic, Uranium, Saltwater, or certain Industrial By-products; then the waste stream must be considered Toxic or Hazardous and must be dealt with accordingly (lined pits,tanks,etc.) then taken to a Toxic dump for disposal.
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Source is river, attached raw water analysis, production 100 m3/h with salinity less than 0.8 g/l
Hi Terry, thanks for advise, the raw water comes from a riverand the RO-Plant is located on the farm, is not possible to return the concentrated water to the river. So our proposal it is realized a storage tank of the rejects, but it seem not economic as the discharge rate is high (about 25 m3 / h), so we are looking for other solutions to evacuate these discharges. (raw water does not contain heavy metals just mineral salts)