1.Introduction

1.Introduction

With the direct purification method for lakes and marshes based on bio- technology, the series of tests were carried out to treat bottom sediments black colored rotten mud and suspended sludge's on the bottom layer of the marsh, which enabled to f reduce and prevent rot odor of the mud and to facilitate further treatment in subsequent steps The objectives of the experiments were placed to the restoration of phytobenthoses and benthic animals.