BVT-Merkblatt zu Abwasser- und Abgasbehandlung

Art. 5.7.2.2
Annexes
§ 1. The dumping of all solid wastes, strongly acid wastes, purifying waste materials, weakly
acid wastes or neutralised wastes is prohibited.
§ 2. For existing establishments the following transitional provisions apply:
1. for existing plants making use of the sulphate process:
the discharge of weakly acid and neutralised wastes in all waters is restricted to a value of no
more than 800 kg total quantity of sulphate – i.e. corresponding to the SO 4-ions in the free
sulphuric acid and in the metal sulphates – per produced tonne of titanium dioxide.
2. for existing plants making use of the chloride process:
the discharging of weakly acid wastes, purifying waste materials and neutralised wastes in
all waters is restricted to the following values for the total quantity of chloride – i.e. corresponding
to the Cl-ions in the free hydrochloric acid and in the metal chlorides – per produced
tonne of titanium dioxide:
� 130 kg when use is made of natural rutile
� 228 kg when use is made of synthetic rutile
� 450 kg when use is made of slag;
in the case of an establishment that makes use of more than one kind of ore, the values apply
in proportion to the quantities of the ores used.
Art. 5.7.2.3
For emissions into the atmosphere the following emission limitations apply:
1. for existing plants making use of the sulphate process:
� emission limit value for dust: 50 mg/Nm 3
� provisions must be made to prevent the emission of acid droplets
� the emissions of SO x originating from the dissolution and roasting phases of titanium dioxide
production are restricted to a maximum of 10 kg SO 2-equivalent per tonne of titanium
dioxide produced
� plants where the waste acids are concentrated may not discharge more than 500 mg/Nm 3
of SOx, calculated as SO2-equivalent
� plants where the salts originating from the purification of wastes are roasted, are to be
equipped with the best available techniques to reduce the SO x-emissions;
2. for existing plants making use of the chloride process:
� emission limit value for dust: 50 mg/Nm 3
� chlorine: - daily average of: 5 mg/Nm 3
� instantaneous value of 40 mg/Nm 3 .
Art. 5.7.2.4
Regarding wastes from the titanium dioxide industry - and in particular wastes of which the
discharge or dumping into water or emission into the atmosphere is prohibited - the necessary
measures must be taken in order to ensure that:
1. as far as possible they are not created, or that they are reused, insofar as this is possible technically
and economically;
2. they are reused or disposed of without endangering human health and without adverse effects
on the environment.
The same applies to wastes generated during the recycling or purification of the aforementioned
wastes.
Waste Water and Waste Gas Treatment 365