(BAT) Reference Document for the Production of Chlor-alkali ...

Chapter 4
Technical considerations relevant to applicability
Generally, there are no technical restrictions to the applicability of this technique.
Economics
{Please TWG provide information.}
Driving force for implementation
The driving forces for implementation of this technique include the following:
reduction of operating costs due to reduced consumption of water and acid;
environmental legislation.
Example plants
Concentration of brine filtration sludges is generally used by chlor-alkali plants [ 3, Euro Chlor
2011 ].
Reference literature
[ 3, Euro Chlor 2011 ]
4.3.2.2.6 Use of waste water for solution mining
Description
This technique consists in treating waste water from the chlor-alkali plant and pumping it back
to the salt mine for its reuse in solution mining.
Technical description
{Please TWG provide more information.}
Achieved environmental benefits
The achieved environmental benefits of this technique include the following:
reduction of water consumption;
reduction of salt consumption;
reduction of chloride emissions.
Environmental performance and operational data
At the Dow plant in Stade (Germany), all waste water generated in the chlor-alkali plant are
treated and sent back for solution mining. No waste water is generated [ 57, EIPPCB 2011 ].
{Please TWG provide more information.}
Cross-media effects
Some raw material and energy is used for the treatment of the waste water prior to recycling.
Additional pipelines and energy are required to pump the waste water back to the mine.
WORKING DRAFT IN PROGRESS
Technical considerations relevant to applicability
This technique is restricted to sites which use solution-mined brine as raw material.
Economics
{Please TWG provide information.}
Driving force for implementation
The driving forces for implementation of this technique include the following:
reduction of operating costs due to reduced consumption of water and salt;
environmental legislation.
192 December 2011 TB/EIPPCB/CAK_Draft_1