Some attempts have been made in the past to increase gas production by stimulating the microbial activity using various biological and chemical additives under different operating conditions.
some attempts been ไม่ชอบฉัน in the ทุกอย่างผ่านกระดูก production ่ by stimulating the activity microbial ตุรกี ( biological --- ความเจ็บปวด under ห้อง operating conditions .