The experience of introducing the technology of chemical precipitation of phosphorus: from laboratory tests to industrial-scale operation

Summary

Meeting the latest recommendations of the Helsinki Baltic Marine Environment Protection Commission (HELCOM) calls for the introduction of advanced efficient methods of nutrients removal (mainly phosphorus) from municipal and industrial wastewater. Ferix-3 coagulant was chosen as a chemical. Industrial tests of chemical precipitation of phosphorus at the Kolpino, Kronstadt, Metallstroy settlement wastewater treatment facilities, as well as at the Central wastewater treatment plant, South-West wastewater treatment facilities and North wastewater treatment plant of St.-Petersburg are discussed. Chemical injection points and dosages for additional chemical dephosphorization were chosen depending on the treatment technology, automation level, wastewater composition, stability and irregular incoming flow rate.

Key words

sewerage treatment facilities , HELCOM recommendations , municipal and industrial wastewater , laboratory tests , industrial-scale tests , chemical injection points , dosing

Experience of SUE «Vodokanal of St. Petersburg» in eliminating HELCOM hot spots in the light of the development of the Russian environmental legislation

Summary

The activities implemented by SUE «Vodokanal of St. Petersburg» to fulfill the recommendations of the Helsinki Convention on the protection of the Baltic Sea against pollution are outlined. The work completion stages on eliminating the discharge of raw wastewater into the Gulf of Finland, upgrading and reconstructing the treatment facilities, and improving the efficiency of wastewater treatment are described. The measures taken provided for almost eliminating all the hot spots identified by the Helsinki Commission (HELCOM) for St. Petersburg. A comparison of the HELCOM strategy and the progress in developing the Russian environmental legislation is given. The experience of the enterprise in wastewater sludge handling in the light of the implementation of the HELCOM recommendations and Russian legislation is presented. Information is provided on the development of the European legislation in relation to the utilization of useful properties of municipal wastewater sludge. Development patterns are proposed to improve the Russian legislation regarding municipal wastewater sludge handling in order to avoid the emergence of new hot spots.

Key words

HELCOM recommendations , biogenic elements , chemical precipitation of phosphorus , sludge incineration plant , best available techniques (BAT) , technologically regulated substances , hot spots (subspots) , eutrophication , Helsinki Convention , Helsinki Commission (HELCOM) , wastewater sludge handling , nutrients recycling , utilization of the useful sludge properties , recoverable resources , sideline products , circular economy

The experience of SUE «Vodokanal of St. Petersburg» in developing programs for improving the environmental efficiency

Summary

The experience of developing programs for improving the environmental efficiency in the context of the requirements for their development and approval by the Interdepartmental Commission under the Ministry of Industry and Trade of the Russian Federation for the facilities of SUE «Vodokanal of St. Petersburg» is presented: the Central Wastewater Treatment Plant, Northern Wastewater Treatment Plant, the Southwestern Treatment Facilities. The following issues have been accentuated: the specific features of developing programs for improving the environmental efficiency for water and wastewater utilities operating public wastewater disposal systems in settlements and urban districts that discharge effluents into the Baltic Sea catchment basin; the required dates for developing and approving the programs. Attention is drawn to the need for strict compliance with the requirements to the program components. Particularly noted are the nuances of comparing the actual quality of discharged effluents in relation to the technologically regulated substances with selected process parameters of the best available technology. Examples of the analytical evaluation of the choice of indicator values and technological solutions for the stages of the program activities are given. The focus is drawn toward the need to analyze all the best available technologies regulated by the adopted information and technical reference books. The aspects of highlighting the results of the inventory of pollution discharges in the programs are indicated.

Key words

best available techniques , HELCOM recommendations , technological indicators , technologically regulated substances , program for improving the environmental efficiency , public wastewater disposal system , complex ecological permit