This paper gives an approach to the corrosion resistance analysis and changes in the chemical composition of anNiTi alloy in the shape of a disc, depending on different real seawater environments. The NiTi discs were analysed after 6 months of exposure in real seawater environments: the atmosphere, a tidal zone, and seawater. The corrosion tests showed that the highest corrosion rate for the discs is in seawater because this had the highest value of current density, and the initial disc had the most negative potential. Measuring the chemical composition of the discs using inductively coupled plasma and X-ray fluorescence before the experiment and semiquantitative analysis after the experiment showed the chemical composition after 6 months of exposure. Furthermore, the applied principal component analysis and cluster analysis revealed the influence of the different environments on the changes in the chemical composition of the discs. Cluster analysis detected small differences between the similar corrosive influences of the analysed types of environments during the period of exposure. The obtained results confirm that PCA can detect subtle quantitative differences among the corrosive influences of the types of marine environments, although the examined corrosive influences are quite similar. The applied chemometric methods (CA and PCA) are, therefore, sensitive enough to register the existence of slight differences among corrosive environmental influences on the analysed NiTi SMA.

This study evaluates the effectiveness of KMnO4, MK3 and 1-butanol inhibitors on corrosion of AISI 314 and AISI 304 stainless steels using linear and potentiodynamic polarization in 0.1 M HNO3. The metrics like corrosion potential (Ecorr), current density (jcorr) and polarization resistance (Rp) influence the inhibitor efficacy. The inhibitors improved electrochemical parameters significantly, indicating strong anti-corrosive properties. 1-Butanol had the strongest effect, enhancing corrosion potential and drastically reducing corrosion current density, demonstrating superior protection. The results indicated that without inhibitors, both steels showed higher corrosion rates and more negative potentials, reflecting their susceptibility to corrosion. The introduction of inhibitors markedly improved these parameters, particularly with 1-butanol, which significantly enhanced the polarization resistance and shifted the corrosion potential towards less negative values. The potentiodynamic results highlighted the dynamic effectiveness of inhibitors, reinforcing their role in mitigating corrosion under varied conditions. The study underscores the importance of selecting the appropriate inhibitors to enhance the durability and longevity of stainless steels in acidic environments, with 1-butanol showing the potential for industrial applications requiring high corrosion resistance. This necessitates comprehensive testing to accurately measure inhibitor capabilities in different conditions.

Wastewater is water that has gone through a certain use cycle and has become harmful to the environment. According to its place of origin, it is divided into sanitary and industrial wastewater. When sanitary and industrial wastewater are mixed, municipal wastewater is formed. In order to prevent the quality of the environment and human health from being endangered, this wastewater must be treated before being released into the surrounding environment. Wastewater treatment systems play a key role in environmental protection, as they remove pollutants before the water returns to nature. They prevent the pollution of rivers and lakes, protect biodiversity, preserve human health and enable the reuse of treated water. Key aspects of their role are: Preventing water pollution: They remove organic matter, heavy metals, nitrates and phosphates that can lead to eutrophication (uncontrolled algae blooms that destroy all other aquatic life). Protecting biodiversity: Maintaining water quality in rivers, lakes and seas directly protects fish, plants and other aquatic species. Protecting public health: Purification destroys pathogenic microorganisms (bacteria and viruses), thus preventing the spread of infectious diseases through water. Water circulation (recycling): Modern systems allow purified water to be used for irrigation in agriculture or for industrial purposes, thus saving natural resources.

The quarries, due to their area of exploitation, generate stormwater that needs to be dealt with in a legally regulated manner, in order to protect the environment. When examining each surface mine, it is necessary to determine in detail whether there are surface and underground streams at the location and in the surrounding area. Usually, the location of the quarry, that is, the exploitation field is located in a limestone area, so surface water that occurs due to precipitation must be dealt with in an appropriate manner, due to the very technological process that takes place at the quarry. At quarries, due to their area of exploitation, rainwater is generated, which needs to be dealt with in a legally regulated manner, in order to protect the environment. When examining each surface mine, it is necessary to determine in detail whether there are surface and underground streams at the location and in the surrounding area. Usually, the location of the quarry, that is, the exploitation field is located in a limestone area, so surface water that occurs due to precipitation must be dealt with in an appropriate way, due to the very technological process that takes place at the quarry. In order to be able to make an adequate calculation of precipitation water, multi-year monitoring of precipitation in a given area is carried out, namely: • mean annual amount of precipitation, • annual fluctuation of precipitation, • the highest rainfall for the month in the monitoring year, • maximum daily precipitation, • maximum hourly precipitation. The aim of the work is to show how important it is to collect rainwater from quarries, in order to resolve their further treatment and discharge into the recipient, for the reason that these waters can be significantly contaminated, so their discharge without prior treatment could have a significant negative impact. impact on the quality of the environment.

Due to the extreme and enormous development of mankind in all areas, especially in the field of technology, the result is the development of settlements and an increase in the number of inhabitants, which conditions the pollution of the human environment, and water pollution is among the most severe forms. Of course, the increase in the number of inhabitants increases the consumption of water, and thus the amount of waste water also increases [1]. The main sources of pollution of the Zeta and Morača rivers are certainly sanitary and fecal waste water, which is discharged into these surface streams without prior adequate treatment. This is especially pronounced in the Municipality of Danilovgrad and the Capital City of Podgorica. Namely, the Municipality of Danilovgrad does not have a wastewater treatment plant built, while the existing plant in Podgorica is of inadequate capacity. The municipality of Nikšić has a WWTP with a capacity of 110,000 EP, on which three types of treatment are applied: primary, secondary and tertiary treatment, which removes N, S and P. Disinsection of the effluent is also carried out at this WWTP. The existing WWTP in Podgorica has a capacity of 55,000 EP and has two types of treatment: primary and secondary treatment. Effluent disinfection is not carried out at this facility. The purpose of the analysis of pressures and impacts is to identify significant pressures affecting the surface water bodies of the Zeta and Morača rivers.