Process for the catalytic deodorization of and reduction of the nitrogen content in liquid manure tank effluents

A process for the elimination of hydrogen sulphide, mercaptans, ammonia and volatile amines from an organic liquid, said process comprising:

• (a) passing air into said organic liquid, and catalytically oxidizing the mercaptans to disulphides, and simultaneously reacting said hydrogen sulphide with a basic medium introduced into said organic liquid so as to form a salt of hydrogen sulphide, and withdrawing from said organic liquid a gaseous stream containing residual oxidizing air, ammonia and volatile amines;
• (b) dividing said withdrawn gaseous stream containing air, ammonia and volatile amines into two streams;
• (c) subjecting a first divided gaseous stream, amounting to between 30 and 70% of said withdrawn gaseous stream, to catalytic combustion so as to convert the ammonia and the amines to nitrogen oxide;
• (d) mixing the resultant nitrogen oxide stream with the second divided stream containing air, ammonia and amines, and catalytically reducing said nitrogen oxides in the resultant mixture so as to form nitrogen.