4376701 Waste water treating apparatus

vessel, the anion exchange resin being selective of chromium in its chromate and dichromate ionic forms, and the cation exchange resin being an intermediate acid cation exchange resin with a phosphonic acid functional group on a cross-linked polystyrene matrix, having the repeating structural formula: (*See Patent for Chemical Structure*) selective of zinc in its ionic form, said single vessel, having distributors selected from the group of inlet distributors, regenerant distributors, subsurface washers, collectors, disposed therein, and inlets and outlets for the addition or removal of effluent, water and regenerant.

Poly(2-vinyl pyridine- 1-oxide), a nontoxic water-soluble polymer, is useful for chelating heavy metal ions, such as mercury and lead, found as a result of poisoning or environmental contamination. The polymer forms stable metal-chelate complexes and is effective over a wide range of pH values. 4377483 METHOD OF REMOVING DISSOLVED HEAVY METALS FROM AQUEOUS WASTE LIQUIDS Kasane Yamashita; Takao Ikehata; Kazuhiko Tate; Keisuke Nakahara; assigned to Nippon Kokan Kabushiki Kaisha

4376702 WASTE DISPOSAL APPARATUS Stuart H. Small

A powder of a slag formed at the time of manufacturing steel is used to remove heavy metals contained in waste water. After the use the slag may be heated to recover the heavy metals adsorbed thereby or the used slag may be formed into solid blocks, ballast or aggregate by admixing with Portland cement or alumina cement.

Waste disposal apparatus suitable for the collection of waste from a vacuum sewer system, which comprises a tank having a waste inlet and a waste outlet and means for reducing pressure in the tank such that, in use, the waste inlet is above the level of waste in the tank and reduced pressure is maintained above the waste level and waste can thereby be drawn through the waste inlet, in which the tank further comprises an air inlet through which air can be caused to pass into, and thereby cause aerobic digestion of, waste in the tank.

4376706 CHROMIUM AND ZINC REMOVAL AND RECOVERY BY ION EXCHANGE Terrence I. Scott; Vincent H. Westlake; Michael Bridle; assigned to Petro-Metals Recovery Systems Limited

4376701 WASTE WATER TREATING APPARATUS Tadaaki Tada Fujimoto; Taketosh Madokoro; Akio assigned to Kubota Ltd

Kawasugi; Toriyama;

A waste water treating apparatus comprises an inner chamber and an outer chamber disposed around the inner cham-

In the removal of chromium and zinc, the combination of an anion exchange resin and cation exchange resin in a single 341

and cooled. The mixture melted in situ with a laser.

can also be

4375412 METHODS FOR THE TREATMENT OF ORGANIC MATERIAL AND PARTICULARLY SEWAGE SLUDGE Keith A. Schimel ber extending to a considerable depth. The inner and outer chamber communicate with each other at the bottom portion, whereby the inner and outer chambers form a downward and upward flow chamber, respectively, for circulating waste water. The waste water that flows from the downward flow chamber to the upward flow chamber is circulated to the downward flow chamber by means of a pump. An oxygen containing gas is simultaneously supplied into the circulating waste water. An apparatus for monitoring the concentration of oxygen or carbon dioxide in an exhaust gas is provided at an outlet of the upward flow chamber. The oxygen containing gas being supplied is controlled to a predetermined optimum flow rate in response to the monitored concentration.

Anaerobic digestion of organic material, particularly biological sludge, such as sewage sludge, is carried out in a closed system having a first digestion tank and a second concentration and partial digestion tank. The concentrated and partially digested sludge is fed to the first tank where it is maintained under vacuum such that an active zone of organic material undergoing digestion is detained therein for a long period of time. The digested sludge is withdrawn against the vacuum and has approximately 80 to 90% of the organic solids therein mineralized; thus simplifying dewatering and ultimate disposal of the sludge. Pathogens including viruses are also removed from the digested sludge. Denitrification takes place in the vacuum digester tank and gas consisting essentially of nitrogen is removed. Return sludge from the vacuum digester and influent sludge is fed into the second or concentrator tank to facilitate reseeding with anaerobic organisms. Both tanks are provided with passageways which are coterminous near the upper ends of the tanks and provided with baffles which direct the flow to be in opposite directions in the passageways, thus providing for stripping of the gas and solid-liquid separation. Gas consisting essentially of methane and carbon dioxide is produced from the second tank. Supernatant from the second tank may be recirculated to the source of the sludge to facilitate degrada-

4376070 CONTAINMENT OF NUCLEAR WASTE James M. Pope; Don E. Harrison; assigned to Westinghouse Electric Corp. Disclosed is a method of immobilizing nuclear in glass. A composition is prepared of about 30 to about 85% of a hydrolyzed glass-forming silicon compound, about 5 to about 30% of a glassforming sodium compound, up to about 30% of a glass-forming aluminum compound, and about 5 to about 30% of a glass-forming boron, calcium, or magnesium compound. Up to an equal amount of nuclear waste is mixed into the composition and the mixture is heated at up to 500 degrees C. until dry. The mixture is then melted at 800 degrees to 1300 degrees C., and can be poured into ingots 342