US 5,914,040 AGranted

Process for the purification of a medium containing organic waste

AssigneeRhone-Poulenc Chimie

InventorsYvette Pescher, Jean-Paul Raes, Sylvain Danda, Bernard Castelas, Fran.cedilla.ois Rabatel, Jose Morales, Jean Bonfill

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Abstract

The present invention relates to a process for the purification of a medium containing organic waste. The process according to the present invention is characterized in that the starting medium (or effluent) containing the organic waste is subjected to the following stages: (i) treatment with at least one oxidizing agent; (ii) treatment with at least one flocculating agent; (iii) treatment with at least one polyelectrolyte, and in that the effluent obtained on conclusion of all of these stages is subjected to a filtration stage (iv), whereby a filtration cake and a filtrate are obtained. The process according to the present invention is more particularly useful for the treatment of pig manure.

Claims32

Dependent claims

A process for the purification of a liquid animal manure, comprising the following stages:

(i) treating said manure with at least one oxidizing agent to oxidize fine hydrophilic colloids and remove sulfur-containing compounds in said manure;
(ii) treating said manure with at least one inorganic flocculating agent to precipitate phosphorus and nitrogen protein compounds, and decrease BOD and COD in said manure;
(iii) treating said manure with at least one polyelectrolyte to remove colloids and form an effluent containing a sludge which can be directly dewatered by filtration;
(iv) subjecting the effluent obtained upon carrying out the above stages (i), (ii) and (iii) to a filtration stage, whereby a filtration cake and a filtrate are obtained;
and
(v) subjecting said filtrate to an ultrafiltration stage, whereby a retentate and an ultrafiltrate are obtained.

3 more elements

Dependencies are inferred from the claim text.