When DS was about eighteen months he went through a similar phase.
When we went to playgroup I had to watch him like a hawk. If he did manage to bite one of the other children we would all make a fuss of the child who had been bitten and completely ignore DS.
He was a very affectionate child with lots of older cousins who adored him same with aunties and uncles. When we had visitors everyone had a turn to hug him and when we went to playgroup he wanted to hug all the other children.
They in turn would pull away and that is when he would bite.
It only lasted about 6 months and I will be forever greatful to all the wonderful mums at playgroup who worked with us during this stressful time.
Most of us are still friends to this day and we still have a laugh occasionally about DS's biting episode.
busygirl a child of this age does't actually think to herself "Right I'm going to bite someone today". It's an emotional reaction and the last thing you need is other mums being judgemental. It's not as though you are not aware of the problem.
When I took DS somewhere new or he was around childen he didn"t know, I would jokingly made an announcement about "the biter" in their midst and most people would keep an eye on their children.
DS didn't actually bite too many times (due to my alertness) but the worst one was biting another child on the face near the cheekbone.
Today he is turning 27 in July and is still best mates with the other boy. We sonetimes et the photo out where the bite is clearly visible.
I honestly think that what got through to DS was the fact that he was totally ignored when he had bitten another child and the bitten child was made a fuss of.
Usually we would buy something small or make a cupcake and take it with us the next time we saw that child.