Integrated treatment of tapioca processing industrial wastewater based on environmental bio-technology

摘要: Tapioca processing wastewater containing high COD (9,630-13,760 mg/L), BOD (7,280-11,510 SS (450-1,850 total nitrogen (291-355 mg/L) phosphorus (39-73 and low pH (3.4-4.6) are one of the major causes severe pollution to receiving source in South Vietnam. Based on characteristics tapioca wastewater, biological treatment processes selected for study. In which UAF, UASB, aeration tank pond system series. For this technology, UAF reactor is used as pre-treatment reducing SS. The removal efficiencies ranged from 67-82%, equivalent influent decreased 450-1,850 mg/L 148-290 mg/L. core UASB-reactor, responsible organic matter. OLR UASB-reactor can achieved 42 kgCOD/m 3 .d with HRT 8.3-8.4 hours. 10,498-14,330 1,082-2,178 mg/L, 82.5-90.7%. post-treatment. They take responsibility remainder matter, removal. With around 6-8 hours 6-7 days system, effluent COD, 78-94 4.5-5.7 7.3-7.9 respectively. granular sludge was observed after 20 operating at 6 . study also showed that nutrients trace elements necessary using but only start-up period, when lower than able stand a shock load concentration three times higher normal, 24 hrs stretches, without any damage completed recovery took 2-3 days. investigate cyanide toxicity exerts distinct toxicity, particular hydrolysis process starch particles. Hence, these particles within 2 control experiment (using 2g gVSS/L conducted 30 o C), while 120 mgCN - /L it up But compared process, acidification much less affected by cyanide; always proceeded immediately experiments reduction sulphide ions do not reduce through formation thiocyanate, instead reinforce cyanide. And addition Fe 2+ significantly reduces methanogenesis ferro-cyanide complex, does stimulate degradation conclusions research solution comprising implementation AnWT-technology combined aerobic post-treatment, clearly demonstrates big benefit energy cost savings resource conservation together its feasibility meet really extremely discharge standards. It shows how strong returns be generated investors CDM. estimate required capacity 2,000 m /d will produce 4,200 6,200 biogas per day (>60 % methane gas), 2,600 3,800 liters FO day. plant estimated 850 1,260 US$