| Many of these are soluble in water and become dissolved in any surplus moisture in the landfill site to produce a liquid mixture termed leachate. |
| The leachate was separated from the solids by centrifugation, and the dissolved polonium isotopes in the liquid were plated spontaneously onto a silver planchet. |
| The leachate was collected and then chemically converted to true saltpeter, potassium nitrate, by mixing it with a solution of potash. |
| Sludge in the landfill ferments and produces polluting leachate and greenhouse gases. |
| It also provides a means of collecting most of that leakage and therefore is a second leachate collection system. |
| The residual material no longer produces methane, and leachate is much reduced. |
