Abstract
The increase of sulphate content in natural water sources due to anthropogenic causes leads to a corresponding increase of sulphate and sulphide concentrations in wastewater. Biochemical reactions occurring in sewage systems of sulphate reduction to sulphides and their subsequent oxidation to sulphuric acid cause microbially induced acid corrosion of concrete pipes. In addition, biochemical processes occurring in wastewater are accompanied by the release of toxic gases, including hydrogen sulphide, which adversely affect the human body. The methods based on the binding of hydrogen sulphide into insoluble metal sulphide are recognised as promising for the treatment of sulphide-containing waters. For the realisation of the process, it is offered to use iron compounds as the least toxic and relatively cheap reagents. The complex coagulant based on ferric diatomite, sodium ferrite and iron compounds for the treatment of wastewater from hydrogen sulphide is developed. Test tests of iron-containing coagulant have been carried out: at a flow rate of sewage 2,73 m3/hour, optimal dose of reagent 90 mg/l the concentration of hydrogen sulphide in treated water is 1,07 mg/l, that is close to maximum permissible concentration (MPC) values for sewage - 1 mg/l.