The paper presents the basic methods of disposal and recycling of waste activated sludge. We propose a new technology of neutralization of waste activated sludge and subsequent disposal in the form of an adsorbent for cleaning oil-contaminated wastewater and production of complex fertilizers, allowing to intensify the process of phytoremediation of soils from oil.
This work presents various constructions of photobioreactors for microalgae Chlorella Sorokiniana cultivation. We studied dependence of biomass production rate on photobioreactor construction. We suggest special photobioreactor construction for pilot-scale biomass production. We explored the ways to use the obtained biomass as a source for lipids and carotinoids. We recommend to use waste biomass for obtaining of sorption materials for water purification. The spent sorption materials may be used as a co-substrate for fermentation of organic wastes.
Cultivation of duckweed Lemna minor in conditions of St. Petersburg was carried out. Two cultivation variants were studied: 1- in a natural reservoir of Petergof; 2 - in an artificial reservoir at the yard of Peter the Great St. Petersburg Polytechnic University (Russia) during a period from May to July 2017. The following cultivation conditions were determined: lighting, temperature. The population growth intensity was estimated by increase of plant cover area of the pond. The most favourable conditions appeared to be at natural pond in Petergof. Daylight features, lightning intensity of the Leningrad Region are less favourable than that for south Russian regions, so biomass production rate is drastically lower. However, the climatic characteristics (moderate climate, transient from continental to marine) allows increasing L. minor cultivation period: from May to November inclusive. We carried out atomic-physiological investigation of fronds in summer and autumn, as well as epidermis and chlorenchyma cell analysis, which allow one to characterize photosynthesys system of the plants.
The paper presents the results of testing of a high-performance method for decontaminating sewage, involving combination of ultrasonic and ultraviolet exposure at the final step of water purification aimed at destroying pathogenic microorganisms and thereby preventing the spread of infectious diseases. A variation of the method was developed and patented by the authors and passed the test at one of the most advanced water facilities in Russia which is the Vodokanal of St. Petersburg. The combined unit was manufactured at OOO Novotech-EKO and installed at the South-West Wastewater Treatment Plant (SWTP) of Vodokanal of St. Petersburg. The results of the test showed the efficiency of combined ultraviolet and ultrasonic wastewater treatment, both in terms of intensifying disinfection and in terms of the stability of the plant operation by preventing biofouling and salt deposition on the surface of the lamp casings. The latter fact was the basis for the pilot project of improvement of the existing system of UV wastewater disinfection at the SWTP.
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