the purpose of this study was comparison of applicability of tertiary treatment of tehran domestic sewage with organic and inorganic coagulants or a combination of them. the far test procedure was applied utilizing: alum, polyelectrolyte wt 2600, anionic polyelectorlyte wt 3000, and nonionic polyelctrolyte wt 2690 as organic coagulants (products of calgon). the combination of lime with each of ...

Some authors in fact refer to episodes as chemical arachnoiditis. Jolles et al. at the National Institute for Medical Research, London, ( [1] ) discussed Drug-induced aseptic meningitis (DIAM), which they denoted as "uncommon." The authors remarked that most of the literature comprises anecdotal case reports. The major types of causative drugs are nonsteroidal anti-inflammatory drugs ...

The use of chemical compounds benefits society in a number of ways. Pesticides, for instance, enable foodstuffs to be produced in sufficient quantities to satisfy the needs of millions of people, a condition that has led to an increase in levels of life expectancy. Yet, at times, these benefits are offset by certain disadvantages, notably the toxic side effects of the chemical compounds used. E...