Optimization of chemical water treatment costs in the process
of abstraction from surface water sources

Summary

The operational experience of «Samarskie Kommunal’nye Sistemy» LLC in the optimization of chemical water treatment costs in the process of water abstraction from the surface water source is presented. The Saratovskoe water reservoir has been the only water supply source of Samara urban district. Seasonal variations of water quality in the water reservoir call for the upgrade of the chemical water treatment method with the purpose of improving the efficiency of the treatment processes. To determine the optimal dosage of chemicals the process of chemical water processing in Lovibond ЕТ-750 flocculator has been being simulated at the laboratory of the water treatment plant using the required set parameters: mixing time, sedimentation time, time of passing through the facilities; mixing rate. During test coagulation the features of the generated sludge and its sedimentation rate are monitored. The results of the test coagulation provide for regulating the chemical dosages and water processing modes. The optimal dosages of chemicals determined during the test water coagulation provided for the economical efficiency 33,48% in 2016; 31,3% in 2017. A combined water treatment flow scheme with the use of two coagulant types: polyaluminum chloride in winter and less expensive aluminium sulfate in summer is introduced. Routine test coagulation with the purpose of the optimal chemical dosage depending on the water source quality provides for optimizing and planning chemical costs to ensure the water quality meeting the requirements of Sanitary Regulations and Norms 2.1.4.1074-01 «Drinking water. Hygienic requirements to the water quality in public drinking water supply systems. Quality control».

Key words

surface water source , water treatment , test coagulation , chemical dosage , cost optimization

Cost optimization for the implementation of «Teberdinsky group water main in Karachaevo-Cherkessiya» investment project

Summary

A financial model for the return of investment funds for the construction of a gravity-pressure water main (100 km long with the elevation difference of 800 m) that has no analogues in world practice is presented. A dynamic method for evaluating an investment project was used that involved the calculation of five indicators: NPV, PI, DPP, IC and ARR. The analysis of the above calculated indicators was carried out on the basis of which conclusions were concretized concerning cost indicators for the development of project documentation, works on the construction and erection of a water main and in-line structures, tariffs, construction time, payback period, performance of payments for water, etc. The advantage of the investment project is that the quick repayment of credit funds is provided from two directions – from the sale of drinking water to the population and from the sale of the electricity generated in the operation of the water main.

Key words

investment project , cost optimization , water main , economic characteristics , repayment of funds