Glossary L-O

Land application Discharge of wastewater onto the ground for treatment or reuse.
Landfills 1. Sanitary landfills are land disposal sites for non-hazardous solid wastes at which wastes are spread in layers, compacted to the smallest practical volume, and covered at the end of each operating day.

2. Secure chemical landfills are disposal sites for hazardous wastes that are selected and designed to minimize the chance of release of hazardous substances into environment.

Leachate A liquid that results when water collects contaminants as it trickles through wastes, agricultural pesticides or fertilizers.
Leaching The act of dissolving the soluble portion of a solid mixture by some solvent. An example is the dissolving of inorganic or organic contaminants from refuse in a landfill by infiltrating rain water.
Mass balance An organized accounting of all inputs and outputs to an arbitrary but defined system. Stated in other terms, the rate of mass accumulation within a system is equal to the rate of mass input less the rate of mass output plus the rate of mass generation within the system.
Mixed Liquor Suspended Solids (MLSS) The total suspended solids concentration in the activated sludge tank.
Mixed liquor volatile suspended solids (MLVSS) The volatile suspended solids concentration in the activated sludge tank.
Non Point Source Pollution (NPSP) Any pollution from a source which cannot be attributed to a particular discharge point, e.g. from agricultural crops, city streets, construction sites, etc.
Overland flow A land application technique that cleanses waste by allowing it to flow over a sloped surface. As the water flows over the surface, the contaminants are removed. The water is collected at the bottom of the slope for reuse.

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