03156nas a2200265 a 450000500170000000800410001703500150005810000210007324500780009426000670017230000230023949000270026250001460028950200580043552020090049365000360250265000260253865000170256470000380258170000410261970000490266071000570270981000590276685600650282520260817171418.0210704s2021    th u  m rtt   000 a eng d  a.b123720310 aThanawat Udombua10aBiochar-based constructed wetland for treating solar septic tank effluent  aPathum Thani, Thailand :bAsian Institute of Technology,c2021  a70 leaves :bill. 1 aThesis ;vno. EV-21-18  aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management  aThesis (M. Sc.) - Asian Institute of Technology, 2021  aConstructed wetlands (CWs) were considered to treat effluent water from the solar septic  tank afterward. Lateritic soil is suitable to select as the main material of media. However,  the efficiency of lateritic soil to adsorb N and P in SST effluent still is low. Biochar has been  used for soil remediations traditionally which it has benefits for plant uptake of nutrient (N  and P). The rubber wood sawdust has the highest carbon. For effective biochar, the biomass was activated by 2.3M MgCl2.6H2O before a pyrolysis. Therefore, biochar can be used for  combining lateritic soil to apply in the soil-based constructed wetlandsto be a Biochar-Based  Constructed Wetland (BBCW). The results of media efficiency showed that yield percentage  of biochar NB-300, MgB-300, NB-500, MgB-500, NB-600, and MgB-600 are 58.5, 58.36,  25.4, 40.42, 23.96, and 33.9, respectively. Biochar pyrolysis at low temperature was weight  more than high temperature, and the pyrolysis at 500 o C and 600 o C, the MgBs was weight  more than the NBs. The NH3-N adsorption of MgB-500 were 5.32 mg/g, which was  maximum compared with other conditions. The MgB-600 and MgB-500 were the highest  adsorption of TP arrived at 0.78 mg/g and 0.75 mg/g, respectively. Therefore, the MgB-500  was employed to used or applied into a constructed wetland. In addition, MgB-500 can  highly adsorb NH3-N and TP for 24h and 8h, respectively from a time function experiment.  The results of investigation of the BBCW show that concentrations of COD, TSS of the  BBCW can remove that more than 80% and 90%, respectively. The BBCW were nutrient  (N and P) removal efficiencies highly more than SBUP which was only soil as media layer.  The BBCW was removal efficiency of TN were 64.14%, 65.08%, and 75.90% for HRT 12h,  24h, and 36h, respectively, which were TN removal efficiency more than BBUP which was  unplanted. For design criteria, an appreciate criteria to design the BBCW to remove  pollutants in SST effluent was HLR 0.09 m3 /m2 .day. 0aBiocharxEnvironmental aspects  0aConstructed wetlands  0aSeptic tanks0 aThammarat Koottatep,eChairperson1 aXue, Wenchao,eExamination committee0 aTatchai Pussayanavin,eExamination committee2 aRoyal Thai Government Fellowship,eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. EV-21-18  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B13491