Wastewater treatment facilities of Adler city

Summary

The wastewater treatment facilities in Adler (Greater Sochi Area), some of the most modern facilities in Russia were built as a part of the Olympic infrastructure. The Adler wastewater treatment facilities were designed on the basis of innovative solutions: for the first time 3-D engineering was applied; the best available techniques were taken into account; zero emission system was implemented – all the facilities are covered by airproof covers; the air from the facilities is supplied to the gas cleaning system; sludge handling includes dewatering and drying; consequently the amount of sludge is reduced and sludge is disinfected. The process scheme stipulated by the project includes primary mechanical treatment of wastewater, full biological treatment, tertiary treatment and effluent disinfection. The system of generated sludge utilization includes mechanical dewatering in centrifuges with subsequent additional drying. The design concept behind the project formulated more than 10 years ago (2008 project) determined the development path of the advanced treatment technologies and served as an example of the wastewater treatment facilities built according to the principle of the best available techniques.

Key words

wastewater , best available techniques , sewerage treatment facilities , sludge utilization , discharge standard

Commercialization of landfilled sludge

Summary

The problem of municipal and industrial wastewater sludge utilization is analyzed. The option of environmental utilization of sludge by its commercialization in building and agricultural sectors is considered. To provide for the wide use of the considered approaches the following is required: full expert consideration; development of engineering specifications for every product type; introduction of amendments and supplements into the regulatory and legal framework; development of valid mechanisms of implementing sludge utilization projects; development of ways of tax exemption of profit received from the sales of waste-derived products and receiving state aids for reducing interests on bank loans.

Key words

sludge , heavy metals , organics , sludge utilization , bitumen concrete , ceramics , fertilizers

Developing efficient methods of mixing during chemical treatment of wastewater suspension

Summary

In recent years the problem of wastewater sludge disposal has become more and more urgent for the municipal economy. The results of a study of the process of sludge suspending with Dezolak, a lime-containing agent, are presented; the size of solid inclusions is determined to provide for calculating the required rotation speed of the mixing device: the average Sauter particle diameter was 55 μm, the density of the solid phase was 2211 kg/m³. For effective chemical suspending the angular velocity of the mixer should be more than 0.03 m/s. The main similarity criteria for scaling the apparatus were investigated; it was determined that while choosing a mixer, the Froude criterion Fr should be taken into account, since that very indicator was practically constant for the three investigated reactors. Based on the work done, it was determined that the ratio of power to the volume of the mixed liquid cannot be a criterion for calculating devices equipped with GMS mixing devices: for these mixers, a decrease in the mixing power with an increase in the size of the device is valid.

Key words

wastewater , mixer , sludge utilization , lime mixing , lime-containing chemical