Study on the treatment of solid waste in constructed wetland by the larva of Hermetia illucens
As an efficient sewage treatment system,constructed wetlands have been widely used to treat various refractory pollutants,but there are few studies on maintenance and management.In this study,7 solid waste addition gradients(0%,20%,30%,40%,50%,60%and 100%)were set for the reclamation of solid waste in constructed wetlands,and wheat bran and corn flour were used to study the growth,nutrient composition and nitrogen and phosphorus content of Hermetia illucens.The results showed that after 16 days of breeding,the growth and feed utilization of the 20%solid waste group was second only to that of the non-added group,and the weight gain rate,feed coefficient and specific growth rate were(444.90±6.45)%,(3.52±0.21)%and(10.60±0.37)%,respectively.Feed utilization rate and biological conversion rate were(47.9±4.12)%and(28.5±1.23)%,respectively.The contents of VSS,ash,crude protein,crude fat and organic matter in solid waste from constructed wetland were(36.37±2.33)%,(63.63±2.27)%,(30.76±2.07)%,(1.37±0.03)%and(19.19±1.26)%respectively.Withtheadditionofsolidwasteinconstructedwetland,exceptforcrudeash,crude protein and nitrogen in feed and bait,other components gradually decreased,and nitrogen and phosphorus in Hermetia illucens gradually decreased.
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