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Biological sulfate (SO42 ) reduction was examined in anaerobic sequential batch reactors (ASBRs) operated under different hydraulic retention times (HRTs) ranging from 12 to 36 h and COD (Chemical Oxygen Demand)/SO42 ratios of 2.4, 1.6 and 0.8. Competition between SO42 reducing bacteria (SRBs), methane producing archaea (MPAs) and homoacetogens (HACs) was examined in controls and cultures treated with linoleic acid (LA). The ASBR performance was influenced by the COD/SO42 ratio in control cultures with a SO42 reduction of 87% at a COD/SO42 ratio of 0.8.

IRobot Roomba,Incredible. But even if it wasn’t we’d still want itWhile it’s certainly the most exciting option of them all, (come on, who doesn’t want a robot to clean their house for them while they watch telly?) the Roomba completely reinvents house cleaning as we know it.Aimed to clean the house once a day, rather than once a week, it has a very small capacity bin, meaning that the first time you do it, you’ll need to empty it several times. However, once it’s all set up, cleaning the house will become your favourite chore of them all.You can get it from John Lewis forRead More10 best vacuum cleaners for 2018 top deals including Dyson, Shark and HooverA lovely device although it doesn’t have the best run timeNot only do we love the bright colour of this device, but it also features that same, easy to use pistol grip handle as the Dyson et al.Much less bulky than its predecessors, while it is admittedly very powerful, it only has a 20 minute run time.Therefore, rather than professional cleaners and big families, we reckon the Gtech is much better suited to the likes of London dwellers living in small flats that want a high performance device for cleaning up to three rooms that they can easily tuck away into cupboards after..

Science teacher immediately ran at him, swatted a gun out of his hand and tackled him to the ground, Stonebraker said. It weren for him, more of us would have been injured for sure. Told ABC News that Seaman threw a basketball at the shooter and ran toward the bullets as screaming students sought cover behind a table..

The first bird of the day was a Cooper hawk in a grove of trees, followed by two red tailed hawks that flew into trees at the base of the mountain. They were routed out by a pair of American crows. Other, common birds appeared as we drove slowly along and rock doves, tufted titmice and European starlings.

The knife with the moose handle is a beauty and a great tool, which I m using daily. The blade is about 300 years old, maybe it has been used for killing, its sheer age leaves space for fantasy. It is made by a former friend of mine, a pastry chief, who was famous for his scrimshaw works too.

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