20.500.12556/RUL-187915 Influence of neem leaf powder as a natural coagulant in MBR employed to treat dairy wastewater Vpliv prahu iz listov neema kot naravnega koagulanta v MBR, uporabljenem za čiščenje odpadne vode iz mlekarn This study pretreats dairy wastewater prior to MBR processing using neem leaf powder as a natural coagulant. Scanning Electron Microscopy, X-ray Diffraction, Fourier Transform Infrared Spectroscopy, and EnergyDispersive X-ray Analysis revealed that neem powder has a high surface area, an amorphous-crystalline structure, and coagulation-promoting functional groups and elements. Jar tests optimized coagulant dosage, pH, mixing time, and settling duration. Under ideal conditions, turbidity and COD decreased significantly. Both MBR systems, with and without neem pretreatment, were tested for COD reduction efficiency, transmembrane pressure, permeate flux, specific oxygen uptake rate, and sludge settleability. In the experimental MBR reactors, neem-based pretreatment substantially enhanced COD removal efficiency, peaking at ~99% at a 6-hour hydraulic retention time (HRT), compared to ~90% without pretreatment. The neem-integrated system showed reduced TMP accumulation (17.9 kPa vs. 27.6 kPa), increased flux retention (22.7 vs. 12.9 liters per square meter per hour), and enhanced microbial activity, as measured by Mixed Liquid Volatile Suspended Solids (MLVSS) (23.5 mg O₂/g MLVSS/h). These results indicate that neem powder may enhance biodegradability and reduce membrane fouling, making dairy wastewater management more sustainable. V tej študiji se je odpadna voda iz mlekarne pred čiščenjem z membranskim bioreaktorjem (MBR) predhodno obdelala z uporabo prahu iz listov neema kot naravnega koagulanta. Analize z vrstično elektronsko mikroskopijo (SEM), rentgensko difrakcijo (XRD), Fourierjevo transformacijsko infrardečo spektroskopijo (FTIR) in energijsko disperzijsko rentgensko analizo (EDAX) so pokazale, da ima prah neema veliko površino, amorfno-kristalno strukturo ter funkcionalne skupine in elemente, ki spodbujajo koagulacijo. Testi v kozarcih so optimizirali odmerek koagulanta, pH, čas mešanja in trajanje usedanja. V idealnih pogojih sta se motnost in KPK znatno zmanjšala. Oba sistema MBR, s predhodno obdelavo z neemom in brez nje, sta bila testirana glede učinkovitosti zmanjšanja KPK, transmembranskega tlaka (TMP), permeatnega toka, specifične hitrosti privzema kisika (SOUR) in usedanja blata (SVI). V eksperimentalnih reaktorjih MBR je predhodna obdelava na osnovi neema bistveno povečala učinkovitost odstranjevanja KPK, ki je dosegla vrh pri ~99 % pri 6-urnem hidravličnem zadrževalnem času (HRT) v primerjavi s ~90 % brez predhodne obdelave. Sistem, integriran z neemom, je pokazal zmanjšano kopičenje TMP (17,9 kPa v primerjavi z 27,6 kPa), povečano zadrževanje toka (22,7 litra na kvadratni meter na uro (LMH) v primerjavi z 12,9 LMH) in okrepljeno mikrobno aktivnost, merjeno s hlapnimi suspendiranimi snovmi v mešanici aktivnega blata in vode (MLVSS) (23,5 mg O₂/g MLVSS/h). Ti rezultati kažejo, da lahko prah neema poveča biorazgradljivost in zmanjša mašenje membran, s čimer postane upravljanje odpadne vode iz mlekarn bolj trajnostno. MBR coagulant neem leaf powder cod reduction transmembrane pressure specific oxygen uptake rate sludge settleability fouling MBR koagulant prah listov neema zmanjšanje KPK transmembranski tlak specifična hitrost privzema kisika usedanje blata mašenje true false true Angleški jezik Slovenski jezik Članek v reviji 2026-09-16 08:49:54 2026-09-16 08:50:01 2026-09-17 04:29:58 0000-00-00 00:00:00 2025 0 0 Str. 127-146 no. 69 Vol. 38 dec. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 628.312:637.1(078.7) 0352-3551 10.15292/acta.hydro.2025.09 291218179 Prakash-Influence_of_neem_leaf_powder_as_a_natural_coagulant_in_MBR_employed_to_treat_dairy_wastewater.pdf Prakash-Influence_of_neem_leaf_powder_as_a_natural_coagulant_in_MBR_employed_to_treat_dairy_wastewater.pdf 1 D61EC961C5D32ED85FB3655CD3D1E356 7bc5c66719c1eb80c9d4e42d60cc44f331c0deeecbcc4c6d497c12b3360017b5 d9fe1373-b19a-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=247750 https://actahydrotechnica.fgg.uni-lj.si/si/paper/a38rp 1 cedc28f0-b19a-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=247749 Fakulteta za gradbeništvo in geodezijo Acta hydrotechnica 0 0 0