the no removal over oxide sorbents (k2o/al2o3 , cao/al2o3 and bao/al2o3) at a loading of up to 25 wt.% was investigated using a synthetic diesel exhaust gas containing  1,000 ppm no, 1000 ppm iso-butane (i-c4h10), 8% o2 and n2 balance. the reactor was operated  at 250 oc to 450 oc for the activity study. no was effectively stored (removal efficiencies between 30-60 %) as nitrate under experimen...

introduction: the powdered activated carbon treatment (pact) has been proposed as an alternative in wastewater treatment and wastewater biomass protection against toxic substances. this study aims to evaluate pact performance in treating dyes, acid orange, and remazol brilliant reactive blue. methods: this empirical- applied research was carried out in pilot scale in which different dye removal...

in this research, a plot consisting of two sequencing batch reactors (sbr) both reactors were anaerobic stageand its aeration time was had the primary anaerobic stage witling change inthe'touilr:eaction time (9.5 hours).the average concentration of influent phosphorus and rector were 7.5 and 800 miligram per litre respectively. in two months periods the average effeciencies of phosphorus r...

horseradish peroxidase was encapsulated in calcium alginate for the purpose of phenol removal. considering enzyme encapsulation efficiency, retention activity and enzyme leakage of the capsules, the best gelation condition was found to be 1 % w/v of sodium alginate solution and 5.5 % w/v of calcium chloride hexahydrate. upon immobilization, ph profile of enzyme activity changes as it shows high...

conclusions application of rhamnolipid biosurfactant produced by pseudomonas aeruginosa significantly improved pyrene removal in contaminated soils. results the pyrene removal efficiency in samples containing biosurfactant, without biosurfactant and controls, were 86.4%, 59.8% and 14%, respectively, after 63 days. the difference of pyrene removal efficiency between the biosurfactant-containing ...

background: benzene, toluene, ethyl benzene and xylene compounds (btex) are very dangerous in terms of health and environmental and have high toxicity in aquatic environment. the purpose of this study was to investigate the performance analysis of petroleum hydrocarbons xylene using solar radiation uv/tio2 method in industrial synthetic waste . methods: an experimental-interventional study was ...

existence of acid humic in water resources is undesirable and causes carcinogenic component in disinfection process due to reaction with chlorine. due to their cost-effectiveness and higher physical resistance than activated carbon, natural zeloites are used for removing various pollutants. . in the present study, iranian natural zeolite modified with cetylpyridinium bromide (cpb) was investiga...

in this work, efficiency and performance of hazelnut shells (hs) adsorbent was examined for the removal and recovery of direct red 12b (dr12b) from wastewater. the absorbance of dr12b was measured spectrophotometrically at λmax=523 nm before and after adsorption of dr12b. the maximum removal was 99.8% for 30 mg l –1 ofdr12b concentration on 0.3 gr hs adsorbent. acidic ph was favourable for the ...