Process Optimization Example for ASM1 Analyzes COD Composition in Influent Water from Municipal Wastewater Plants
In order to further improve the operation and management level of the sewage treatment plant.The component changes of the influent COD in the sewage treatment plant were systematically investigated.Based on the ASM1 theory,the influent COD components of municipal sewage plants were classified.The influent data of a sewage treatment plant with long-term dosing carbon source were collected,and the contents of CODtot,CODsol,CODss and CODsI in 14 sets of data were determined.At the same time,the efficiency of the wastewater treatment biochemical system was further studied by measuring the changes of anaerobic pond,anoxic pond I,aerobic pond I,anoxic pond Ⅱ,aerobic pond Ⅱ,aerobic pond II.In the middle of the wastewater treatment biochemical system.The results showed that the average values of CODtot,CODsol,CODss and CODsI in the influent were 158,54,25,and 29.4 mg·L-1,respectively.The removal rate of CODsol gradually decreased along the direction of the biochemical segments.In addition,due to the process structure of multi-point inlet water in the anoxic pond,the allocated inlet water provided a carbon source to the anoxic pond II,which promoted the removal of total nitrogen.However,some nitrogen-containing pollutants were introduced,resulting in an increase in ammonia nitrogen in the pool.From the perspective of pollutant removal effect and cost saving,it can be concluded that:(1)The proportion of inert substances in the influent COD is large,and the carbon source required for the removal of total nitrogen is insufficient,and an external carbon source needs to be added for a long time.(2)Rational use of the characteristics of multi-point inlet water in the process to provide carbon sources for anoxic ponds II.and reduce the addition of external carbon sources.(3)Aerobic pond I.Excessive dissolved oxygen will destroy the anoxic pond II.Hypoxic environment,the aeration volume of aerobic pond I.should be reasonably controlled to avoid waste of energy consumption.