This process involves the following manipulations: mechanical sorting and crushing, biological treatment with aerobic drying. 1,440. 58.811. 43. Recycling of GHG Emissions from Wastewater Treatment Plants. Biogas collection from wastewater treatment plants (WWTP) for electricity generation. 620. 9.267. 44. Olive Tree Program 2020–2030. Extension of action #15 over 232,000 hectares. 628. 6.591. 45. Fruit Arboriculture Program (excluding citrus and olive trees) 2020–2030. Extension of action #16 over 112,000 hectares. 527.