INTRODUCTION

Development of Transport System is linked to the concept of “green logistics”. It is the assurance of the well-being of present and future generations that have effects on the free movement of goods, energy consumption, environment, human health, safety and comfort. Therefore, development of transport must include issues of the reduction of the negative impact on the environment.

Reducing pollution from road vehicles and associated negative impact on the environment and human health is one of the most relevant questions in environmental policy of each country.

In order to preserve nature and the environment for future generations, to halt the loss of biodiversity and to protect the soil, the European Union Member States are committed to prevent damage and should damage is caused, to remedy it. Therefore, in 2004, Directive on environmental liability with regard to the prevention and remedying of environmental damage was adopted (Report under article…). This directive establishes a framework based on the polluter pays principle to prevent and remedy environmental damage.

Directive on Environmental Liability aims to form a conscious approach and incentives to invest in prevention measures and better environmental practices. All operators are encouraged to assess the risk and take necessary steps to minimize it.

Hazardous waste can be absorbed into the soil, pollute ground water and thus harm the environment and human health. Therefore, it is very important to distinguish such waste from the general waste stream and correctly transport and handle it (utilize).

Problem statement. Carrying goods and waste by road or rail involves the risk of traffic accidents. If the goods and waste are hazardous, there is also the risk of incidents, such as spillage, leading to hazards such as fire, explosion, chemical burn or environmental damage. Road or railway transportation of hazardous goods and hazardous waste is characterised by wide numbers of different fields, which are reflected in many professional and scientific areas. In general, the most important impact is determined by the global – European and national legislation. National characteristics of economic sectors, existing transportation technology and other local aspect are also important. It is thus important to apply the concept of “green logistics”, define elements of traffic safety and distinguish the most relevant characteristics in the system of hazardous waste transportation.

The aim of the article – to analyse the peculiarities of health hazards, its transportation characteristics and suggest an algorithm for determining the consignment volume and selecting transportation method in order to prevent damage to the environment and humans and minimize the risks.

PECULIARITIES OF HAZARDOUS WASTE

Hazardous waste comprises a separate waste group. According to the levels of hazardousness and handling specifics, the following streams are distinguished:

• petroleum waste products;

• petroleum-contaminated waste;

• hazardous vehicle waste;

• waste contaminated with toxic heavy metals;

• chemical waste;

• medical waste.

Household hazardous waste – is a non-industrial waste generated in the households, small enterprises, institutions or organizations, legal entities and offices. These may include: primary cells, batteries, outdated medicines, household chemicals, waste of varnishes, paints, thinners, chemicals and contaminated packaging materials, used oil, oil filters and other petroleum waste products, mercury-containing waste, used tires and other hazardous waste (Landrigan, 2004).

Slack, Gronow and Voulvoulis (2004) maintain that “household hazardous waste includes waste containing hazardous substances originating from domestic sources”. Recently, household hazardous waste has been on the rise due to ever-increasing solid municipal waste.

Industrial waste is defined as waste generated by manufacturing or industrial processes; remnants, which wholly or partially lost their original properties (chemical or physical). Table 1 provides information on the amounts of the collected health hazards for the period of 2010–2017.

The quantities of hazardous waste are illustrated in Figure 1.

Figure 1. The total quantities of hazardous waste 2010–2017 in Lithuania (in tonnes) (Created by the author based on statistics)

Table 2 provides information on the accidents registered in Lithuania, as well as the remediation process. Source: The Environmental Protection Agency (EPA) and statistical data.

Global hazardous waste flows and waste management technologies are major sources of environmental litigation. They reflect the political structures and struggles within and between developed and less developed countries (Khoo & Rau, 2009).

Boulton (2015) states that one of the most dangerous and toxic substances known is spent nuclear fuel. The author suggests that this waste can be recycled into fresh fuel or into materials suitable for weapons-grade.

THE CONCEPT OF GREEN LOGISTICS

According to scientific literature and works conducted on the sustainable development and logistics, (Cherrett, 2009; Guo-Chuan, 2010; Harris, 2007; McKinnon, 2010; Palmer, 2010; Rodrigue, 2001; Rodrigue, Slack, & Comtois, 2001; Srivastava, 2007), it was noted that the concept of “green logistics” is linked to sustainable development in the transport sector. Implementation of the “green logistics” – is the company’s ability to carry out its operations considering economic, social and environmental factors while increasing labour efficiency and competitiveness (Bagdonienė et al., 2009; Lowe, 2002; Thiell et al., 2011).

Lithuanian scientists identify “green logistics” as highly energy efficient and less environmentally damaging global logistics system that ensures resource-saving, improves waste disposal, increases labour efficiency and reduces negative impact on the environment (Kutkaitis & Župerkienė, 2011).

Čiegis and Grunda (2007) claim that logistics operations are carried out in such a way that the environmental pressures, such as road congestion, air pollution, reduction of the fuel consumption and waste minimization are key factors in political decisions. According to Čepinskis and Masteika (2011), green logistics encompasses 4 implementation fields:

1. Distribution: intermodal transport, reverse logistics, alternatives to transport modes (rail, inland waterways, maritime transport);

2. Energy consumption: reduction of energy consumption, reduction of the levels of the pollution, incorporation of the CO2 reduction levels into companies’ operation policies, assessment of the logistic activities to impact the environment.

3. Manufacturing (production): applications of the clean technologies, waste reduction, its processing and management.

4. Raw material mining: sustainable purchase, applications of the less polluting substances, recycling, re-use of the products.

However, the current situation reveals that the concept of “green logistics” is poorly examined and the analysis of practical implementation is insufficient. In addition, there is a lack of business models that meet not only economic but also ecological and social needs of society; no specific measures are proposed (Hoessle, 2013).

It is important to calculate the size of dangerous cargo and waste batches and select transportation methods in transporting of dangerous cargo and hazardous waste. Therefore, algorithm for determination of cargo consignment volume and selection of transportation methods is provided in the following chapter.

ALGORITHM FOR DETERMINATION OF CONSIGNMENT VOLUME OF HEALTH-HAZARDOUS WASTE

The organization of dangerous cargo (including hazardous waste) under long-term agreements involves determination of the optimal consignment volumes and selection of transportation methods. The costs of transportation reduce in the case of large consignments, however, the costs of storage increases; and in the case of small consignments – vice versa. Algorithm for Determination of Consignment Volumes and Selection of Transportation Methods is suggested. Optimality criterion − overall costs for storage and transportation.

Three transportation methods are analysed:

1. Cargo is delivered in accordance with long-term agreements in large batches. Semi-trailers or trucks are used as a means for transportation. Cargo is partially loaded.

2. Cargo is delivered in medium-sized batches that do not fully load semi-trailers or trucks. Transport enterprises are specialized in delivery of medium-sized batches; generally, integrates cargo into large batches in Cargo Points (Waste Storage).

3. Cargo is delivered in small batches (up to 23 kg) by integrating cargo into several Cargo Points (Waste Storage).

Signification: C – overall costs; C_T − transportation costs; C₁ − storage costs, thus:

Costs for cargo storage are determined in the following way:

here: T – duration of cargo carriage on the road (in weeks); U − intensity of supply and consumption (one tonne per week); P – price of the cargo (Eur per 1 kg); V – costs for cargo storage (Eur per week/per 1 kg).

Costs for transporting one kilogram of cargo are determined as follows:

in case of the first transportation method:

in case of the second and third transportation methods:

here: F – determined costs for the first cargo batch transportation (Eur); R –consignment volume; S – vehicle load capacity (kg); W – price for transporting one kg of cargo irrespective of the consignment volume.

According to (1), (2), (3), (4) expressions (Baublys 2007) it is possible to obtain that overall costs are minimal, if the consignment volume is equal to:

whereas the costs for transporting one kilogram of cargo are equal to:

Figure 2 indicates typical dependencies between general cargo transportation and storage costs and supply intensity.

Figure 2. Dependence of one kg cargo general costs on the supply intensity by diverse cargo transportation methods: 1 – third transportation method; 2 – second transportation method; 3 – first transportation method; 4, 5, 6 – supply intensity, where first, second and third transportation methods are optimal

In Figure 3, the solid line designates the optimal consignment volume dependence on the supply intensity. It can be noted, that under low supply intensity conditions, the third method is the most optimal; under medium supply intensity conditions – the second method, and in the case of high intensity supply conditions – the first cargo transportation method is the most optimal. Dependence of the delivered consignment volume on the supply intensity is not a continuous function.

Figure 3. Dependence of the optimal consignment volume on the supply intensity: 1, 2 and 3 – first, second and third transportation methods

The obtained values enable to optimize transportation process with initial data.

In order to determine the rational structure of the vehicle fleet and the organizational form of transportation, an analysis of the volume of cargo and the time of specific consignments is required. It is worth to note, that selection of the optimal consignment volume depending on transportation intensity is important in transportation of dangerous cargo and hazardous waste. The analysis of the statistical data indicates that the most frequent transportation method is the one, which is conducted in the small quantities.

Provided models of optimization and simulation synthesis of road transport freight system’s topological structure enables the assessment of impact exercised by various structural characteristics on the functioning of the system.

Actions implementing the production capacity of waste management in Lithuania are coordinated by the Ministry of Economy. Health care institutions are responsible for collecting, sorting, packaging, labelling of medical waste and transfer to the authorized waste managers.

REQUIREMENTS RELATED TO THE CARRIAGE OF HAZARDOUS WASTE

European Parliament and Council of 2006 adopted the provisions of Regulations on the supervision and control of shipments of hazardous waste within, into and out of the European Community. The Regulation applied to shipments of waste between Member States, within the Community or in transit through third countries imported into the Community from third countries.

Depending on the hazardousness of the waste, its handling, shipment and countries of destination, there are the following requirements applicable to the shipment of waste:

• Authorization procedure (“Prior written notification and consent”, 4 - Art. 17);

• Simplified procedure (“General information requirements”, Art. 18);

• Insurance of the Shipment (in certain cases; waste import into or export from the European Community).

Act of the carriage of dangerous goods and the European agreement “Accord européen relatif au transport international des marchandises dangereuses par route” (ADR) regulate the carriage of dangerous goods by road (European Agreement…, 2013).

Actions implementing the production capacity of waste management in Lithuania are coordinated by the Ministry of Economy. Health care institutions are responsible for collecting, sorting, packaging, labelling of medical waste and transfer to the authorized waste managers.

RECOMMENDATIONS FOR THE INTERNATIONAL CARRIAGE OF HAZARDOUS WASTES

Hazardous waste often requires transport to an approved treatment, storage, or disposal facility. Because of potential threats to public safety and the environment, transport is given special attention by governmental agencies. In addition to the occasional accidental spill, hazardous waste has, in the past, been intentionally spilled or abandoned at random locations in a practice known as “midnight dumping.” This practice has been greatly curtailed by the enactment of laws that require proper labelling, transport, and tracking of all hazardous wastes.

Hazardous waste is generally transported by truck over public highways. Only a very small amount is transported by rail, and almost none is moved by air or inland waterway. Highway shipment is the most common because road vehicles can gain access to most industrial sites.

Hazardous wastes can be shipped in tank trucks made of steel or aluminum alloy, with capacities up to about 34,000 litres. They also can be containerized and shipped in 200-litre drums. Specifications and standards for cargo tank trucks and shipping containers are included in governmental regulations.

Waste Management Laws govern requirements concerning the transportation of hazardous waste. Stored or transported hazardous waste must be packaged in a way that does not endanger human health and the environment:

• Packaging or containers must be designed and produced in a manner that all of the containing hazardous waste cannot pour, scatter, or otherwise evaporate into the environment.

• Packaging materials must be resistant and not respond to the effects of the containing hazardous waste or its components;

• Packaging or containers and its lids and corks must be firm and hermetic in order not to crack, lose or to come open during the process of transportation;

• Containers with reusable lids and corks must be designed and produced in a manner that involves safe opening and closing; waste and its components do not have any access into the environment.

• All hazardous waste containers and packaging must be labelled (Order of Environment Minister…, 1999).

Corporate actions implementing the production capacity of waste management in Lithuania are coordinated by the Ministry of Economy. Health care institutions are responsible for collecting, sorting, packaging, labelling of medical waste and transfer to the authorized waste managers.

CONCLUSIONS

1. Theoretically, there are all required institutions in Lithuania responsible for transportation of dangerous cargo, however, there is no unified management system and efficient communication among these institutions. Improvement of dangerous cargo system should involve currently operating institutions.

2. The suggested algorithm enables to optimally determine an average number of vehicles in accordance with the tonnage.

3. The algorithm to determine an optimal consignment volume and transportation methods, where the optimality criteria are the general storage and transportation costs, is suggested.

4. Determination of the requirements does not ensure that all members of cargo transportation process are to comply with it. Therefore, in order to obtain this goal, a concerted and effective operating control mechanism is to be established. In this case, practices of the EU countries are to be considered.

5. Considering the potential risk factors – accident probability, damage to the society, environment and values, ability to quickly liquidate the consequences of an accident, it is thus necessary to establish a list of the prohibited and recommended vehicle routes. However, a periodic assessment of risks and adjustment of the routes should be constantly practiced.