Abstract: Method to prevent the exhaustion of acid copper plating baths (12) and to treat sewage or sludges (20) containing copper in an ionic form so as to recover metallic copper (39), the method including the addition (11) of a compound which keeps the concentration of iron below a critical value (for instance, 60 grs/lt. ), the compound causing precipitation of iron in the form of ferrous sulphate and thus preventing the co-deposition of crystals of ferrous sulphate and copper sulphate with a possible incorporation of organic impurities such as stearates (35) present in the acid copper plating baths (12).

Abstract: A method of animal waste treatment which provides the introduction of a solid material in the animal waste, having the following characteristics; a solid geometric shape, a solid which floats in the animal waste, a solid which is biodegradable, a solid which includes at least resins with formaldehyde and ferrous sulfate.

Abstract: An integrated waste reclamation and processing system converts biodegradable liquid and solid waste into poultry products (or the like) and humus-like substances. The system uses earthworms and poultry in a manner in which biodegradable waste is first composted and then used as a substrate for newly hatched worms. The worms grow in the waste for about eighty days and then are harvested and fed to chickens or laying hens, in combination with other food. The waste left behind by the worms has humus-like properties which can be used as a soil conditioner on eroded, strip-mined, or desert land. This conversion system, which is preferably contained in a closed building and maintained operational throughout the year, it is applicable to the needs of small and large waste-producing institutions and facilitates the reclamation of biodegradable waste in a manner which is environmentally acceptable and economically feasible. The structures and machinery used in the system are also shown and described.