TABLE OF CONTENTS Submerged aerated biological filter. See biological aerated filter.
In cathodic protection, an anode that is eaten away before the metal that it protects. It is electrically connected to this metal, which is lower in the galvanic series. The protected metal thus becomes cathodic, and the sacrificed metal anodic.
Submerged aerated filter. See biological aerated filter.
USA legislation initially passed in 1974 that set the standards for drinking water quality. Numerous revisions and enhancements have been made. See National Primary Drinking Water Regulations.
The UK Agricultural Development Advisory Service (ADAS) has published guidelines for the use of wastewater sludge on agricultural land. Untreated sludge must not be used. Conventional treated sludge (e.g. anaerobic sludge digestion or chemical stabilisation or heat treatment) should only be applied on land used for animal feed crops or grazed grass and forage, all subject to various restrictions. Enhanced treated sludge, where the sludge that has been treated so that 99.9999% of the pathogens have been destroyed, has less stringent restrictions on its use and can be applied to crops used for human consumption. Sludge producers must sample and analyse the sludge produced and keep records on the operation and performance of the treatment process and final product standard before it leaves the plant to be recycled on agricultural land. The sludge application and use of land after application must be in...
