Division BAT 11 In order to reduce water consumption and the volume of contaminated water, BAT is to use all of the techniques given below.
United Kingdom
| Technique | Description | Applicability |
|---|---|---|
| (i) Water stream integration | Reduction of process water produced at the unit level prior to discharge by the internal reuse of water streams from e.g. cooling, condensates, especially for use in crude desalting | Generally applicable for new units. For existing units, applicability may require a complete rebuilding of the unit or the installation |
| (ii) Water and drainage system for segregation of contaminated water streams | Design of an industrial site to optimise water management, where each stream is treated as appropriate, by e.g. routing generated sour water (from distillation, cracking, coking units, etc.) to appropriate pretreatment, such as a stripping unit | Generally applicable for new units. For existing units, applicability may require a complete rebuilding of the unit or the installation |
| (iii) Segregation of non-contaminated water streams (e.g. once-through cooling, rain water) | Design of a site in order to avoid sending non-contaminated water to general waste water treatment and to have a separate release after possible reuse for this type of stream | Generally applicable for new units. For existing units, applicability may require a complete rebuilding of the unit or the installation |
| (iv) Prevention of spillages and leaks | Practices that include the utilisation of special procedures and/or temporary equipment to maintain performances when necessary to manage special circumstances such as spills, loss of containment, etc. | Generally applicable |