(EP871597-A1)      Treating a biomass comprising liq. manure from animal husbandry contg. heavy metals comprises anaerobic microbial degradation to form a biogas contg. i.a. hydrogen sulphide gas, conveying at least a part of the biogas through at least part of the microbially degraded biomass to ppte. the heavy metals as metal sulphides and sepg. the mixt. into a ppte. and a supernatant.    USE -   The method is used to treat liq. manure where the biomass also contains organic waste material from households and industry and/or sludge from water purificn. plants.    ADVANTAGE -    The microbial degradation of liq. manure yields very high amts. of H2 S gas. The method is simple and does not require complicated process plants. The H2 S formed by microbial degradation is used in the pptn. of heavy metal sulphides and is emitted to the atmos. only in very low amts. No addn. of pptn. agents is required. The amt. of H2S gas formed as above is many times higher than in the degradation of waste water sludge, which would not be sufficient to ppte. heavy metals in the sludge. The process removes all undesirable substances and the liq. manure further yields methane gas corresp. to an amt. of power which is sufficient to run an entire plant of liq. manure and sludge processing and to leave an excess amt. of power. which may be put into a connected power distribution net.    (JP10512801-W)      Treating a biomass comprising liq. manure from animal husbandry contg. heavy metals comprises anaerobic microbial degradation to form a biogas contg. i.a. hydrogen sulphide gas, conveying at least a part of the biogas through at least part of the microbially degraded biomass to ppte. the heavy metals as metal sulphides and sepg. the mixt. into a ppte. and a supernatant.    USE -   The method is used to treat liq. manure where the biomass also contains organic waste material from households and industry and/or sludge from water purificn. plants.    ADVANTAGE -    The microbial degradation of liq. manure yields very high amts. of H2 S gas. The method is simple and does not require complicated process plants. The H2 S formed by microbial degradation is used in the pptn. of heavy metal sulphides and is emitted to the atmos. only in very low amts. No addn. of pptn. agents is required. The amt. of H2S gas formed as above is many times higher than in the degradation of waste water sludge, which would not be sufficient to ppte. heavy metals in the sludge. The process removes all undesirable substances and the liq. manure further yields methane gas corresp. to an amt. of power which is sufficient to run an entire plant of liq. manure and sludge processing and to leave an excess amt. of power. which may be put into a connected power distribution net.    (US5976372-A)      Treating a biomass comprising liq. manure from animal husbandry contg. heavy metals comprises anaerobic microbial degradation to form a biogas contg. i.a. hydrogen sulphide gas, conveying at least a part of the biogas through at least part of the microbially degraded biomass to ppte. the heavy metals as metal sulphides and sepg. the mixt. into a ppte. and a supernatant.    USE -   The method is used to treat liq. manure where the biomass also contains organic waste material from households and industry and/or sludge from water purificn. plants.    ADVANTAGE -    The microbial degradation of liq. manure yields very high amts. of H2 S gas. The method is simple and does not require complicated process plants. The H2 S formed by microbial degradation is used in the pptn. of heavy metal sulphides and is emitted to the atmos. only in very low amts. No addn. of pptn. agents is required. The amt. of H2S gas formed as above is many times higher than in the degradation of waste water sludge, which would not be sufficient to ppte. heavy metals in the sludge. The process removes all undesirable substances and the liq. manure further yields methane gas corresp. to an amt. of power which is sufficient to run an entire plant of liq. manure and sludge processing and to leave an excess amt. of power. which may be put into a connected power distribution net.    (EP871597-B1)      Treating a biomass comprising liq. manure from animal husbandry contg. heavy metals comprises anaerobic microbial degradation to form a biogas contg. i.a. hydrogen sulphide gas, conveying at least a part of the biogas through at least part of the microbially degraded biomass to ppte. the heavy metals as metal sulphides and sepg. the mixt. into a ppte. and a supernatant.    USE -   The method is used to treat liq. manure where the biomass also contains organic waste material from households and industry and/or sludge from water purificn. plants.    ADVANTAGE -    The microbial degradation of liq. manure yields very high amts. of H2 S gas. The method is simple and does not require complicated process plants. The H2 S formed by microbial degradation is used in the pptn. of heavy metal sulphides and is emitted to the atmos. only in very low amts. No addn. of pptn. agents is required. The amt. of H2S gas formed as above is many times higher than in the degradation of waste water sludge, which would not be sufficient to ppte. heavy metals in the sludge. The process removes all undesirable substances and the liq. manure further yields methane gas corresp. to an amt. of power which is sufficient to run an entire plant of liq. manure and sludge processing and to leave an excess amt. of power. which may be put into a connected power distribution net.