NUMBER SUBJECT. Lake Baikal: problems and solutions
Conduct a ranging of natural-climatic and anthropogenic factors. It is shown that the main factors of lake pollution by nutrients are natural-climatic factors, in particular, forest fires. An analysis of the regulatory framework has been carried out, it has been proposed to harmonize the phosphorus and nitrogen indicators with all-Russian standards. It is established that in the residential areas there is no water treatment to the normative indices. For each class of settlements presented possible technologies for wastewater treatment. The strategy of building of unified system of water disposal in the Central ecological zone of the Baikal natural territory is formulated.
There were considered technologies of wastewater treatment at low-capacity facilities located in specially protected areas of Lake Baikal. Identified the main problems that affect how quality prospects for their solution. There were offered modern energy-efficient technologies with a depleted removal of biogenic elements. Results of researches of energy-saving pneumohydraulic rotating aerator are presented and the mobile installation for systems of wastewater treatment is developed. There was showed the possibility of combining different technologies for wastewater treatment in one combined mobile structure.
One of the indicators of the normalization of sewage quality for discharge into Lake Baikal is absorbed organic chlorine (AOC). The area of possible application of his indicator in conditions of its standardization level is defined. It was shown that this parameter was included in the rationing of wastewater specifically for the determination of organochlorine compounds in the wastewater of Baikal PPM. It was noted that the requirements for determining the AOC indicator for wastewater discharge are normalized at a very low level of determination. Methods for performing AOX measurements have been considered, and concentration levels have been proposed for the determination of chlorine-containing compounds formed precisely in the result of disinfection of sewage by chlorination.
Presented the results of calculations of emissions of pollutants into the atmosphere from heat sources and their comparison with the permissible values for Lake Baikal basins. The ecological ranging of the territory made it possible to determine the areas of greatest emissions: Slyudyansky, North Baikal and the town of Severobaikalsk. As potential directions to reduce anthropogenic impact from heat source proposed: improving the system for cleaning off gases: transition to more environmentally friendly energy carrier medium, as well as renewable energy sources. For each of the directions of environmental protection measures, the areas of rational use were identified and the reduction of emissions of harmful substances into the atmosphere during their implementation. Considered only the possible environmental effect from the introduction of particular direction to reduce the impact on the atmosphere of thermal power facilities, without taking into account the technical and economic assessment of environmental measures, the identification of legislative measures, the development of preferential tariffs, energy prices and other financial and economic mechanisms.
At the present time, no treatment plant located on the Baikal natural territory (BNT) complies with the standards established by the order of the Ministry of Nature No 63 due to the impossibility and attainability of the standards set forth from a technological point of view. The authors proposed new, technologically feasible standards for BNT, taking into account industrial and municipal sources of water disposal, the size of populated areas and stand-alone sewerage facilities, the seasonality factor, and provide a technological justification for the proposed standards. The economic possibility of the current implementation of the standards justified by the authors is taken into account.
ENGINEERING SOLUTIONS
In the technological cycle of enterprises of the forestry complex, a significant amount of wood waste is generated, but due to their high humidity, low energy density and heterogeneous granulometric composition, they refer to difficulty combustible fuels. The perspective direction of their enrichment is granulation. The results of comprehensive study of the energy and environmental performance of industrial lines of granulation of byproducts of sow mill production are presented. The change in thermomechanical characteristics and the fractional composition of wood material in the process of granulation investigated. The components of the heat balance and emissions of gas release are determined. To determine the heat loss to the environment, an elaborated technology based on the application of a relative method supplemented with a television survey. Recommendations for improving the energy-ecological performance of granulation lines are presented.
Monitoring of urbanized territories showed a number of problems, including the flooding of large cities after precipitation; poorly maintained, often densified condition of lawn lands, parks and other areas; soil erosion etc. Some innovation methods of solving these problems are proposed, developed by scientists of Kabardino-Balkarian State Agrarian University named after V.M. Kokov.
SCIENTIFIC DEVELOPMENTS
A formulation method for biopreparations stimulating phytoremediation of oil-contaminated soils based on rhizobacteria was proposed. Technology involves the cultivation of bacterial cultures Bacillus RB15 and Pseudomonas RB43 in a liquid nutrient medium, followed by concentration the biomass by centrifugation and drying the finished product by contact drying. The optimal temperature (23–30 °C) and the duration of the process (three days) were determined at the stage of preparation of the liquid preparation (cultural liquor CL rhizobacteria). A comparative analysis of the results of the concentration of CL using various methods – vacuum evaporation, ultrafitration and centrifugation showed that the application of the method of concentrating biomass in a centrifugal field is most suitable both for technological and operational characteristics. То obtain the finished dry form of preparation, the contact drying method is recommended. The parameter of preservation of the viability of RB cells was used as the main controlled parameter at all technological stages of production. To obtain the finished commodity form of the microbial preparation, it is proposed to use a complex sorbent as a filler in the standardization of the finished product, the moisture sorbent in contact drying, and the carrier for immobilization of bacterial cells. To promote the technology of biopreparations in practice, a pilot experimental industrial production and technological scheme of production were elaborated.
Present the results of study on the development of the technology for the recycling of hazardous waste of organosilicon production to produce grouting solution. It is shown that during hydrolytic esterification of bottoms from production of phenyltrichlorsilane is obtained product which can be used as a grouting solution to isolate the inflow of oilfield water. It is established that the quality of the product is affected by the ratio of reagents, chloride ion content, temperature and duration of polycondensation.
To develop recommendations for improving the efficiency of the use of resource potential of organic waste, studies were carried out on the process of their thermal treatment using the example of plant manufactured by company Wellons type 2D6C8.AO. The plant is operated at one of the enterprises of the pulp and paper industry and is designed to generate process steam both by burning primary gas fuel and by using as a fuel mixture different types of organic waste (bark and wood waste, wood chips and sewage sludge). Based on the results obtained, the criteria for estimate the quality of fuel mixture: ash content (not more than 5 %), humidity (not more than 58 %), calorific value (not less than 4000 J/g), homogeneity of the component and fractional composition of the fuel mix (grain size not more than 25–50 mm) were worked out. Taking into account the developed criteria, the optimum composition of fuel mixture was determined (bark and wood waste 70–80 %, pulp and paper sludge 20–30 %, wood chips 4 %). As the main measures to reduce and stabilize the humidity of the fuel used for combustion, the introduction of dry debarking of wood, preliminary mechanical dewatering of the pulp and paper sludge, additional dosing in the main waste stream of waste formed in auxiliary industries (wooden pallets, boxes, paper scrap, etc.) is recommended. The introduction of the developed measures will prevent the disposal of waste in the environment and minimize the impact of the landfills on the geosystems.
ANALYSIS. METHODS. PROGNOSIS
The conflict between economic growth and the environment favorable state preservation is now more complex and sharper ever. In the conditions of a market economy, economic mechanisms for regulating land use and land relations in cities come to the fore. Anthropogenic impact, which has grown to a global scale, has led to the formation of land plots with objects of the past or "accumulated" environmental damage in the territories of cities inhabited by more than half of humanity. The presence of such facilities leads to emergencies, adversely affects the health of the urban population, as well as pour into the possibility and using land resources cost-effectiveness. In existing assessing the effectiveness of urbanized areas use methods, the main importance attached to economic indicators, and there are no environmental indicators leading to an environmental component underestimation while planning the use of the territory.
The analysis of the current approaches to the assessment of the technical condition of water supply facilities of irrigation systems has been carried out and the need has been established for improving the monitoring technology for reclamative water utilization system on the basis of the development of innovative automated instrument control methods that use the integral evaluation of the remaining service life of structures and the prediction of the service life of the facility. Created software-hardware complex automated diagnostic detection of latent defects providing designs and constructions underlying subgrade acoustic GPR and methods of nondestructive testing, determination of the location and geometric parameters of each structure element malfunctions. As part of the diagnostics, an assessment is carried out: the degree of abrasion, leaching, filtration of concrete elements of structures; indicators of frost resistance and water resistance, the volume of existing damage and the efficiency of the structure. The problem with the evaluation of the effectiveness of the creation and application of automated control systems for technological processes, caused by the lack of standards in the field of melioration regulating such calculations, is identified.
ISSN 2413-6042 (Online)