Study On The Biodegradability Of Polyester Staple Wastewater

The wastewater of polyester staple mainly came from cooling water from the machine and textile device's cleaning water. The wastewater of polyester was high concentrations of organic matter, large acidic and the quality and quantity of the water had large changes. It was difficult to treat polyester staple's wastewater that would cause serious pollution of water bodies if it was discharged directly. There are some documents about biodegradability of PET wastewater, But no related to polyester staple's. This Text studied on the biodegradability of polyester staple's wastewater through laboratory testing and field testing, which had achieved good results, and provided a reliable basis for the polyester staple wastewater treatment's practice.Laboratory tests which serviced for the pilot study can be divided into Hydrolysis and aerobic test, anaerobic and aerobic tests. The results showed that:Result of hydrolysis and aerobic tests: Hydrolysis test of polyester's wastewater COD removal efficiency was around 30% to 40%. After Hydrolysis, aerobic COD removal of the water was about 80%. When the influent COD was 1900mg/L, COD removal rate of Hydrolysis and aerobic test was between 75% and 85%.Result of anaerobic and aerobic tests: When the influent COD was 3000mg/L, COD removal rate of anaerobic was above 80%. After anaerobic test, effluent COD of Aerobic was 250mg/L or so, the removal rate of COD was about 50%. Anaerobic and aerobic tests the overall COD removal rate was above 90%, adding activated carbon it could reach 95%.Laboratory tests showed that when the anaerobic system was effective COD removal efficiency of the treatment can be achieved over 90%.even if the anaerobic reactor was ineffective in dealing with the wastewater, it can also play a hydrolysis acidification effect, and COD removal rate can remain at 75% to 85%.UBF and activated sludge process were used in the pilot study. UBF has 1m high filler layer. The filler can play a role of filtering and retention of microorganisms, keep sufficient quantity of microorganisms in the reactor, promote the formation of granular sludge rapidly, and improve the stability of the anaerobic system. Pilot study showed that:Result of anaerobic system: When the influent COD was 1500mg/L ~ 2500 mg/L , COD removal rate was between 72% and 82%, COD removal rate is relatively high and output water quality of UBF was stable.Result of aerobic System: When the input water's quality at 6 tons per day, influent COD was 500mg/L or so, effluent COD is less than 100mg/L.Result of anaerobic and aerobic systems: In the case of influent COD was 1500mg/L ~ 2500mg/L, effluent COD concentration is very low and less than 100mg/L, COD's removal rate is high and stability at 94%. Without adding activated carbon into the water, the output water's quality met the standards of reuse water at production process.Through tests to verify the biodegradability of polyester staple's wastewater, the studying suggested that the polyester staple's wastewater was suitable for anaerobic and aerobic processes to deal with. Polyester staple wastewater had a good biodegradability of anaerobic and aerobics.