|7632042||Method, apparatus and system for forming drainage and trench forming systems|
An alignment device is disclosed use in maintaining the alignment of longitudinal frame members of a trench-forming assembly. The alignment device comprises a cross member. Extending in the same direction from opposite ends of the cross member is at least one pair o...
|6220784||Method and apparatus for forming a trench|
An apparatus for forming a trench which is adapted to receive at least one grate that will cover the trench. The apparatus comprises first and second frame rails that are connected by at least one removable spacer. The spacer is sized and configured to ma...
|5347074||Fixation of heavy metals, mercury recovery and dioxins destruction in scrubbed municipal solid waste incinerator ash|
Fly ash generated from incineration of municipal solid waste (MSW) when placed in landfills can under mild acid conditions can leach lead and cadmium. A process for stabilizing heavy metals in this fly ash is presented which involves calcining the fly ash...