| Aiming at the high COD content of the garbage concentrate,the BOD content is extremely low,the biodegradability is extremely poor,and it is difficult to carry out the biochemical treatment.At the same time,a large amount of biochemical sludge is generated during the treatment of the biological treatment of the landfill leachate.It is characterized by high levels of heavy metals such as iron and manganese.Therefore,an advanced oxidation technology and landfill sludge activated carbon(LSAC)can be selected to jointly treat the waste concentrate to improve its biodegradability.The LSAC was prepared by chemical activation method,and the LSAC was optimized by the response surface methodology to optimize the optimal performance The adsorption performance of LSAC on humic acid was investigated,and the waste concentrate was treated with ozone and LSAC to optimize the system and improve its biodegradability.The response surface method was used to analyze and optimize the preparation parameters impregnation ratio(sludge quality:chemical activator mass),carbonization temperature and carbonization time.The catalytic performance of LSAC was investigated.When the reaction time was 120 min,the pH was 9,the dosage of LSAC was 6g/L,and the dosage of ozone was 6.9504 g/L.The B/C was the target factor,and the conclusion was obtained.Under the conditions of 0.66,carbonization temperature of 422℃ and carbonization time of 51 min,the B/C incr eased from 0.001 to 0.3354 after the treatment of the garbage concentrate.SEM,EDS,XRD,XPS,FTIR,TGA,etc.were used to characterize the LSAC with the best catalytic performance.The leaching of heavy metals in the prepared LSAC was in accordance with the "Dangerous Waste Identification Standard-Identification of Leaching Toxicity"(GB5085.3-The standard value of the leaching toxicity specified in 2007).Secondly,the LSAC prepared by optimal adsorption conditions was used to adsorb humic acid.The effects of reaction time,pH value,LSAC dosage,reaction temperature and initial humic acid concentration on the performance of LSAC adsorption humic acid were studied.Adsorption kinetics and thermodynamics of humic acid on LSAC.The experimental results show that the adsorption process of humic acid by LSAC accords with the quasi-first-order kinetic model and the Langmuir model.By calculating the thermodynamic parameters,ΔG<0,ΔH<0,ΔS<0.Ozone-LSAC treatment of waste concentrate was carried out to carry out ozone catalytic oxidation test.The effects of reaction time,pH value,ozone dosage and LSAC dosage on waste concentrate B/C and degradation of UV254 were studied.Under the optimal range of factors,the reaction conditions were optimized by orthogonal test.The results showed that the reaction time was 60 min,the pH was 10,the LSAC dosage was 6g/L,and the ozone dosage was 5.3376g/L.At the time,the B/C of the garbage concentrate was raised from 0.001 to 0.383,and the UV254 removal rate was 64.6%. |
