tailieunhanh - Ebook Hazardous chemicals handbook: Part 2

(BQ) Part 2 book "Hazardous chemicals handbook" has contents: Monitoring techniques, radioactive chemicals, safety by design, operating procedures, marketing, transport of chemicals, chemicals and the environment - sources and impact, conversion tables and measurement data,.and other contents. | 10 Monitoring techniques As mentioned in Chapters 4, 5 and 16 chemicals can be a nuisance or pose safety, health and environmental risks, or become wasteful of expensive resources if allowed to escape excessively and uncontrollably into the general or workplace environment. Escapes can result from inadequate process control, errors in operation or maintenance, incomplete understanding of the process, etc. Such problems can arise from both: periodic emissions of chemicals due to the need to open, or enter, the ‘system’ occasionally (. during sampling, cleaning, line-breaking) including both planned and unplanned releases (. due to accidents, human error) and, continuous low-level fugitive emissions from normally-closed points, . valve seals, flange gaskets, pump seals, drain valves. The need to monitor the impact of activities involving chemicals on the environment may stem from sound management practice or to satisfy a host of specific legal requirements. Thus, in the UK under the Environmental Protection (Prescribed Substances and Processes) Regulations 1991, operators must apply BATNEEC to prevent or minimize the release of prescribed substances into the environment, or to render harmless any emissions. The prescribed substances for release into the air are given in Table . No prescribed process may be operated without an authorization from the Environment Agency and air pollutants which must be measured and the frequency of monitoring are set out in the authorization. Compliance with emission limits for municipal waste incineration plants (Table ) also requires monitoring. Table Prescribed substances for release into the air Oxides of sulphur and other sulphur compounds Oxides of nitrogen and other nitrogen compounds Oxides of carbon Organic compounds and partial oxidation compounds Metals, metalloids and their compounds Asbestos, glass fibres and mineral fibres Halogens and their compounds Phosphorus and its compounds Particulate .