31179 Method of processing waste sludge from wet phosphoric acid purification facilities

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possible spontaneous combustion, fire or explosion; comprising adding the oxygen to pure liquid water before it is mixed with the waste liquor. 4368123

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proved method comprises the steps of introducing influent waste at depth into the riser chamber at a point higher in the riser than the point of air injection and withdrawing treated effluent from the riser at a point lower in the riser than the point of air injection. A separation chamber may also be operatively connected to the riser chamber to recover sludge for return to the bioreactor. The method provides an improvement in oxygen uptake rate and reduces the anoxic zone in the reactor thus providing additional capacity for BOD5 removal.

REGENERATIVE COUNTER TOP WATER CONDITIONER Bedfored F. Stanley A bed of silver activated charcoal in combination with a downstream bed of a mixture of anion exchange resins and cation exchange resins aerate, purify, soften and dealkalize water flowing therethrough. Periodic flushing through a unit having a solution of sodium chloride or potassium chloride regenerates both exchange resins. An upright cylindrical container having screen separated compartments for the chemicals and filters receives tap water from a pressure reducing nozzle and discharges the conditioned water through a spigot. The unit containing the chemical regenerant is selectively connectable intermediate the nozzle and container.

31179 METHOD OF PROCESSING WASTE SLUDGE FROM WET PHOSPHORIC ACID PURIFICATION FACILITIES Peter Muerer; Martin Hater; Fritz Meininghaus; Rudige Scheel; assigned to Uhde GmbH

4367146 The invention relates to a method of processing the waste sludge obtained in purification facilities for phosphoric acid produced by the wet process. The composition of this sludge is such that it cannot be utilized for any purpose in this state. It is known that sludge from wet phosphoric acid purification facilities contains different quantities of certain substances, the concentrations being such that these substances may not be allowed to mix with surface water or ground water under any circumstances, not even in the case of dumps. A typical composition of such waste sludge is as follows: (*See Patent for Tabular Presentation*)

LONG VERTICAL SHAFT BIOREACTOR WITH MODIFIED WASTE LIQUOR INJECTION David C.I. Pollock; Malcolm A. Wilson; assigned to C-I-L- Inc. An improved method and apparatus is provided for the treatment of sewage waste in a long vertical shaft bioreactor wherein waste sewage is caused to circulate under air inejcted oxidizing conditions around a loop comprising adjacent riser and downcomer chambers connected at their upper and lower ends. The im346