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

Chapter 4
4.3.3 Metal anodes
{All chlor-alkali installations in the world use metal anodes. It is therefore proposed to delete
this section. An update can be found in the section on high-performance electrodes and coatings
(Section 4.3.2.3.4).}
4.3.4 Techniques for monitoring of emissions
4.3.4.1 Overview
Generic issues of monitoring are described in the Reference Document on General Principles of
Monitoring [ 70, COM 2003 ]. This section deals with specific issues of monitoring of
emissions which are of relevance for the chlor-alkali manufacturing industry. This includes the
monitoring frequency and the available analytical methods. Some analytical methods are
described in detail either because their use in the sector shows some peculiarities or because
there are different methods used which lead to different results. The monitoring of process
parameters which are not linked to emissions is not covered in this section.
4.3.4.2 Common issues of all monitoring techniques
In order to avoid repetitions in the following sections, common issues for all monitoring
techniques are described here.
Achieved environmental benefits
The achieved environmental benefit of monitoring is an improvement of environmental
performance by helping to maintain a proper operation of the plant, including its pollution
prevention and control systems. Monitoring is a prerequisite for corrective actions.
Cross-media effects
Some equipment, ancillary materials and energy are required for the monitoring.
Technical considerations relevant to applicability
Generally, there are no technical restrictions to the applicability of monitoring techniques.
Driving force for implementation
The driving forces for implementation of this technique include:
environmental legislation;
process control.
4.3.4.3 Monitoring techniques and frequency
Description
Monitoring techniques and frequency used vary considerably in chlor-alkali plants in EU-27 and
WORKING DRAFT IN PROGRESS
EFTA countries. The monitoring frequency is usually determined using a risk-based approach
which takes into account both the likelihood of exceeding an emission limit value and the
resulting consequences [ 70, COM 2003 ].
Technical description
Table 4.17 provides an overview of monitoring techniques and frequency.
212 December 2011 TB/EIPPCB/CAK_Draft_1