Abstract: A process for making a shaped biodegradable cellulosic article from cellulose-containing material having a water content of less than about 50 percent by weight. The process includes forming a dry mix of the material, a bonding agent and an expander. The dry mix is fed to a screw extruder and pressurized to a nominal pressure in the extruder. Water is injected into the pressurized dry mix. The wetted mixture is then extruded into a shaped article. A biodegradable product is also disclosed herein.

Abstract: A process having the two-fold result of the disposal of waste pickle liquor and the production of a highly useful fertilizer in which urea is mixed with waste pickle liquor to produce a stable liquid fertilizer.

Abstract: A waste water filtration and sludge removal system for filtering and removing sludge materials suspended in water resulting from steel pickling and cleaning operations and the like. The system includes a trough-like filtering tank having weep holes along the lower edge draining into an inclined channel for capturing filtered water for reuse, and also includes a multiple layer filter bed containing an upper layer of fine jagged surfaced particles for capturing filtered sludge. The sludge layer deposited on the surface of the upper filter layer is periodically moved by means of an adjustable screed blade toward an elevated discharge station for removal from the tank without significantly disturbing the filter bed. The screed blade may be automatically raised out of contact with the sludge layer when operated in the reverse direction.