The article is devoted to the analysis and evaluation of mechanisms of ecological and economic regulation of railway transport in the conditions of technological development in the interests of their improvement. It is indicated that Russia has developed a system of methods of environmental and economic regulation of railway transport. Attention is drawn to the insufficient effectiveness and efficiency of the current system of environmental and economic regulation mechanisms to encourage railway transport entities to technological modernization. The authors indicate the need to develop a comprehensive approach to the analysis and evaluation of mechanisms, taking into account their interdependence, dependence on internal and external factors, risks of technological development of the transport industry, and the impact of each mechanism on the environment. The article proposes to analyze and evaluate the mechanisms of environmental and economic regulation of railway transport based on the analysis and assessment of their contribution to the goals and objectives of state environmental policy at all levels (national, regional, industry, object). To analyze and evaluate the mechanisms of environmental and economic regulation of railway transport in the interests of implementing the state environmental policy in the context of technological development, an algorithm and indicator for analysis and evaluation are proposed. The authors draw attention to an important element of the analysis and evaluation of the mechanisms of environmental and economic regulation of railway transport-an assessment of the environmental and economic effects of the introduction and use of mechanisms. An algorithm and indicator for evaluating the integral ecological and economic effect of the introduction and use of mechanisms of ecological and economic regulation of railway transport are proposed. The proposed approach is aimed at improving the system of mechanisms for environmental and economic regulation of railway transport, taking into account the environmental imperative of technological development of the economy. The article is based on the results of research work on the topic No. 7280-20 «Improving the mechanisms of environmental and economic regulation of the turnover of fecal waste of railway transport», performed by the authors in 2020.

he current scheme for the turnover of human waste is imperfect and has a number of serious problems that lead to the risk of pollution of the surrounding natural environment, the emergence of threats to human health, the accumulation of waste water that is not suitable for further use. one of the aspects of the turnover of human waste is the turnover of fecal waste of railway transport. The article develops the topic raised in the research work on the topic No. 7280-20 «Improving the mechanisms of ecological and economic regulation of the turnover of fecal waste of railway transport», carried out by the authors in 2020. A quantitative assessment of the volume of fecal waste is made, the ways of its utilization in a number of countries are described, the current legislative norms of the Russian Federation that regulate these processes, the existing turnover schemes, in which there are significant amounts of different chemical composition and possible ways of using sewage sludge. possible ways of processing are described, based on the existing world experience and theoretical developments confirmed by experiments. the problems and risks of human involvement in the natural cycle of these wastes are considered, while the ambiguity of the situation and the lack of the only correct solutions are noted. The purpose of the article is to consider the technological directions and techniques that can be useful for creating technologies for processing this material into a competitive product and choosing priority directions in the processing of fecal waste. Special attention is paid to the waste generated during the operation of railway passenger transport and the design of the technological chain that allows more efficient processing of these wastes and minimizes the negative impact on the natural and man-made environment.

Biocidal agents (BAs) are widely used in environmentally safe toilet complexes (ESTC) of passenger railcars to suppress microbial activity in fecal sludge (FS). The subsequent disposal of BA-containing FS at municipal sewage treatment facilities adversely affects their work due to the loss of activated sludge. The antimicrobial properties of BAs based on quaternary ammonium compounds (QAC) and polyhexamethylene guanidine (PHMG), as well as methods for its neutralization, have been studied. It was confirmed that BAs based on QAC and PHMG have an antimicrobial effect on various groups of bacteria, reducing their number by 10-100 or more times. It was found that FS contains two groups of microorganisms with different sensitivities to BA. Methods for the deactivation of BA antimicrobial action in FS were tested with (1) a deactivating agent; (2) incubation with thermophilically digested wastewater sludge as a source of the methanogenic microbial community; and (3) chemical deactivation via acidification or alkalization. The highest efficiency was obtained from thermophilic anaerobic digestion with the pretreatment of FS with a strong acid.

Rational ways of treatment of fecal sludge (FS) from environmentally friendly toilet complexes of railway cars preserved with a biocidal agent (BA) based on quaternary ammonium compounds (QAC) and polyhexamethylene guanidine (PHMG) are considered. The bacteriostatic effect of BA on different groups (aerobic and anaerobic) of microorganisms in preserved FS was shown. An effective method for reducing the toxic effect of BA in FS by means of pretreatment with acid prior to microbiological processing has been proposed. The conditions for carrying out the process were selected, allowing to increase the efficiency of anaerobic fermentation of FS containing BA.

Didecyldimethylammonium chloride (DDAC) and polyhexamethylene guanidine (PHMG) exhibit high antimicrobial activity and are widely used as biocidal agents in chemical toilet additives for the management of fecal sludge (FS). Disposal of such biocide-treated FS to a wastewater treatment plant (WWTP) is a major environmental problem. It is possible to reduce environmental damage through the use of biocidal agents, which easily decompose after performing their main biocidal functions. In this work, it is proposed to use the fact of a gradual increase in pH of FS from the initial 7.5 to 9.0–10.0 due to the decomposition of urea. Six biocidal compounds were selected that are capable of rapidly degrading in an alkaline environment and one that naturally degrades upon prolonged incubation. Four of them: bronopol (30 mg/L), DBNPA (500 mg/L), Sharomix (500 mg/L), and sodium percarbonate (6000 mg/L) have shown promise for environmentally friendly management of FS. In selected dosage, they successfully reduced microbial activity under both aerobic and anaerobic conditions and are cost-effective. After 10 days of incubation, degradation of the biocide occurred as measured by biological oxygen demand (BOD5) in biocide-treated FS. Such FS can be discharged to WWTP without severe damage to the activated sludge process, the need for dilution and additional procedures to neutralize toxicity.