Process for separate treatment and disposal of mixtures of solid and liquid, organic wastes

A process for the treatment of a starting mixture of liquid and solid organic wastes, said mixture being susceptible to at least partial micro biological degradation, with formation of biogas, the process comprising:

• separating said starting mixture into a first sludge phase with enriched dry substance and a first liquid phase containing dilute solids;
• subjecting said first liquid phase to anaerobic treatment, said treatment leading to said formation of biogas and to the development of a second sludge and a second liquid phase;
• and
• subjecting said first sludge phase to aerobic treatment resulting in the formation of a product wherein the product is compost, fertilizer or feed;
• the process further comprising:
• recirculating at least part of said second sludge phase into said starting mixture, thereby causing the formation of biogas in said starting mixture, and recirculating at least part of said biogas obtained from said anaerobic treatment of the first liquid phase into said starting mixture, thereby reducing the pH of said starting mixture by absorption of carbon dioxide contained in said biogas.