Patent ID: 6709592
Filing Date: 2004-03-23
Classification: C02F,C12M,Y02E

Abstract:
Process for removal of sulfur compounds from wastewater, comprising the steps of:a) converting in a first anaerobic suspended sludge reactor organic compounds present in the wastewater to acid compounds, forming an effluent comprising the acid compounds; b) converting the sulfur compounds to sulfide compounds in the first reactor, the remainder of the sulfur compounds being also comprised by said effluent; c) removing sulfide compounds in said first reactor with a stripping gas, forming a gaseous effluent; c2) concentrating said effluent, thus forming a clearer effluent and a more concentrated suspension of sludge, part of which suspension is recycled to said first reactor; d) converting the acid compounds in said clearer effluent to biogas in a second anaerobic reactor; and e) converting sulfur compounds in said clearer effluent to sulfide compounds in the second anaerobic reactor, forming a second liquid effluent.