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(UN number no longer in use) Organometallic compound or Compound solution or Compound dispersion, water-reactive, flammable, n.o.s. (UN number no longer in use) [1] UN 3208 4.3
Toxic by inhalation liquid, water reactive, flammable, N.O.S. with an inhalation toxicity lower than or equal to 200 ml/m3 and saturated vapour concentration greater than or equal to 500 LC50 UN 3491: 6.1
UN Number Class Proper Shipping Name UN 3001: 6.1 (UN No. no longer in use) Phenoxy pesticides, liquid, toxic, flammable (UN No. no longer in use) [1] UN 3002 (6.1) (UN No. no longer in use) Phenyl urea pesticides, liquid, toxic (UN No. no longer in use) [1] [2]
Facultative lagoon (polishing pond) providing tertiary treatment after a constructed wetland in Hamburg-Allermöhe, Germany. Overflow from the facultative lagoon may be routed through one or more polishing ponds supporting lower populations of anaerobic micro-organisms and a higher proportion of aerobic organisms adapted to survival in lower concentrations of organic material.
The system may consist of a single pond or several ponds in a series, each pond playing a different role in the removal of pollutants. After treatment, the effluent may be returned to surface water or reused as irrigation water (or reclaimed water) if the effluent meets the required effluent standards (e.g. sufficiently low levels of pathogens).
A spiral pump, sometimes called a Wirz pump or incorrectly Wirtz pump, is a low lift pump which is composed of a long piece of metal plating, which is wound into a coil and sealed at the top and back extremities so as to resemble a cylinder. The outer cavity serves as the inlet, while the inner (partial) tube serves as the outlet.