求翻译：这是由于磁粉在污泥中作为载体，微生物容易聚集在其周围成簇生长，使污泥絮体的增大，沉降性能提高，污泥不易流失；并且磁粉对微生物生长有促进作用，因此有磁粉反应器的污泥浓度升高。是什么意思？

This is due to magnetic powder in the sludge as vectors, growth of microbes easier to gather in clustered around it, sludge flocs increases, performance increase for settlement, sludge is not easy to loss and magnetic powder on the growth of microbes has a catalytic role, there is a magnetic sludge increased concentration of the reactor.