초록

Method for treatment of biochemical waste which comprises adding acid to the biochemical waste to adjust pH (power of hydrogen ion) thereof, heating the adjusted biochemical waste, adding alkali thereto to neutralize the waste, and treating with anaerobic digestion.

대표청구항 ▼

A method for the treatment of a biochemical waste slurry, with the biochemical waste selected from the group of sewage sludge and garbage, comprising the steps of: providing a slurry of the biochemical waste with a solid density greater than 3% by weight; adding acid to the slurry to adjust its pH t

A method for the treatment of a biochemical waste slurry, with the biochemical waste selected from the group of sewage sludge and garbage, comprising the steps of: providing a slurry of the biochemical waste with a solid density greater than 3% by weight; adding acid to the slurry to adjust its pH to a value below 3.5; heating the slurry having its pH below 3.5 within a temperature range of 60°to 200°C. for a period of 1 to 10 minutes to reduce the viscosity of the slurry; thereafter substantially neutralizing the acidity of the slurry to a pH of 5 to 8; anaerobically digesting the substantially neutralized slurry at a temperature within the range of 20°to 50°C. for 20 to 40 days with mechanical agitation through the action of methane producing bacteria to convert the slurry to methane and a digested sludge; and separating the methane from the digested sludge.