The goal of the presented research works is to prove the following thesis: Does the process of contaminants reduction and effiuent application for arable land fertilization justify the treatment method of waste water from a yeast production facility in soil and plant environment. In order to achieve the above mentioned goal, basically the dynamics of physical and chemical properties change observed for waters, soils and plants irrigated with wastewater from yeast factory has been studied for many years. Part I presented the problems characteristics of production as well as water and wastewater management in the yeast factory, principles and technological effectiveness of the treatment of process wastewater from yeast production in soil - plant environment and impact of irrigation with wastewater on water purity. The research proved that very high biological treatment indices are achieved on the Silesian Yeast Factory fields where process wastewater is utilized i.e. concentration reduction for: BOD5 - 99.3% and COD - 99.7%, - for eutrophic compounds: N,0,.1 - 98.83%, P - 96.25% and K - 99.18%. The obtained percentage of concentration reduction is higher than the standards assumed in the water supply and wastewater discharge consent issued to the factory. The drainage water from the fields irrigated with yeast effluent is of I, II and III class of purity.

The research system of soils for evaluation of the ecological state of farm-land soils in Poland is presented in this paper. Granulometrie composition, pH, organic matter content and the content of heavy metals (Cd, Cu, Ni, Pb, Zn) in soils were determined. On the basis of existing criteria (tab. 1) the state of soil pollution with heavy metals for separate provinces and whole country was estimated. The average heavy metal contents (mg/kg) in surface layer of soils in Poland are as follows: Cd-0.21, Cu-6.5, Ni-6.2, Pb-13.6, and Zn-32.4. The farm-land soils of Poland generally contain natural and slightly elevated level of the investigated heavy metals. This allows to produce high quality of agricultural materials appropriate for consumption and feeding of animals.

Orthogonal frequency division multiplexing has been widely used in many radio frequency wireless communication standards as a preferable multicarrier modulation scheme. The modulated signals of a conventional orthogonal frequency division multiplexing system are complex and bipolar. In intensity-modulated direct detection optical wireless communications, transmitted signals should be real and unipolar due to non-coherent emissions of an optical light emitting diode. In this paper, different hybrid optical systems have been proposed to satisfy real and unipolar signals. Peak-to-average power ratio is one of the biggest challenges for orthogonal frequency division multiplexing-based visible light communications. They are based on a combination of non-linear companding techniques with spreading or precoding techniques. Simulation evaluation is performed under direct current-biased optical orthogonal frequency division multiplexing, asymmetrically clipped optical orthogonal frequency division multiplexing, and Flip-orthogonal frequency division multiplexing systems in terms of peak-to-average power ratio, bit error rate, and spectral efficiency. The proposed schemes are investigated to determine a scheme with a low peak-to-average power ratio and an acceptable bit error rate. MATLABTM software has been successfully used to show the validity of the proposed schemes.

This paper presents an identification method of pollution inflow directions based on the circular graphs of percentiles of pollution concentrations and the possibilities of applying these graphs to estimation of pollutant emission. Based on these graphs of particulate matter concentration recorded in winter and summer seasons, the inflows of dust from the direction of fly ash landfill have been compared for summer and winter periods. This analysis enables to assess the relation of concentrations of pollution from secondary particulate matter suspension to concentrations of pollution generated by other sources. This paper also argues that the 24-hours concentrations, though commonly used, may prove to be an indicator of minor importance to assess air pollution status. On the one hand, excessive 24-hours concentrations impede the identification of the polluter, on the other hand, concentrations generally within permissible limits may occasionally peak dangerously at some sources. As an example, an existing case and a numerical experiment have been presented.

Pyrolysis is often a first step in the incineration process, especially of the hazardous waste. One of examples of such installation is presented in the paper cylindrical pyrolysis chamber, applied in the incineration plant for medical waste. In the chamber the carbonisation of the waste takes place and the products, such as volatiles and carbonisate are burned in the cylindrical combustion chamber surrounding the pyrolysis chamber. Such configuration provides the heat transport from the flue gases to the carbonising material. To model the processes taking place in the pyrolysis chamber the energy and mass balance equations have been defined. The system of equations was solved for the exemplary material, such as wood sawdust, of a known thermophysical properties. Results are presented as diagrams of various parameters inside the two-dimension domain of the chamber.

The studies concerned qualitative and quantitative analysis of seston Rotifera communities of Ślepiotka stream polluted with communal sewages. The samples were also taken from the small, inforest pond confluence with the stream. The studies were carried out from March to November 1999. The water from the pond, which flew down into the stream, had a good influence on the Rotifera communities living there. The stable increase in species diversity, abundance and stability of Rotifera communities of Ślepiotka stream below the inflow was recorded. The physic-chemical analysis confirmed the favorable influence of the pond on Ślepiotka stream water quality.

The chemical fundamentals of one variant of the chelate method of combined removal of sulfur and nitrogen oxides from flue gases were described. Special attention was paid for chemical reactions responsible for production of solid wastes. A flow sheet of the technology was presented and the operation of industrial installation of SO2, NOx and dust from combustion gases of two 29 MW, grate boilers each was described. The material balance of the process was made and the quantity of solid wastes produced during 3 weeks test of the technology was presented.

The results of the first (since 1939) investigation of Gliwice Channel have been presented. The concentrations of mobiles and constant forms of heavy metals in the bottom sediments have been given. The changes range was: for chromium 4.8-463.2 mg Cr/kg, for cadmium 0.6-18.2 mg Cd/kg, for lead 4-197 mg Pb/kg, for cupric 6-2152 mg Cu/kg, for manganese 33-1664 mg Mn/kg, for nickel 5-85.2 mg Ni/kg, for zinc 64-2244 mg Zn/kg, for iron 2080-94080 mg Fe/kg. The percent participation of stable forms of chromium decreases during longitude profile of canal whereas participation of mobile forms is increases. The stable and mobile forms of cadmium (Cd) increase. The concentrations of stable and mobile form of lead (Pb) decrease. The percent participation of stable forms of copper (Cu) is high (82- 100%). On total longitude of canal the participation of mobile forms of manganese (Mn) increases, but stable forms have advantage. For nickel (Ni) the stable forms are prevail too (form 55% to 81%). The participation of mobile forms of zinc (Zn) is 18% to 60%. The sharply outlined relationship between metals and organic matter concentrations indicates the significance in the metals transport processes from water to bottom sediments. Consequently, pollution of bottom sediments by heavy metals is the secondary result of organic substances of water enrichment. The relationships between total metals and iron (Fe) concentration points to the role of heavy metals stable amalgamations with amorphous ferric oxides. The cascade character and pulsatory water flow of Gliwice Channel makes the concentrations of heavy metals in bottom sediments successfully decrease in each canal section. At the same time, in each section of the canal gradual increase in metals concentration occurs and the maximum values for all determinated metals are present just before sluices closing sections. The best ecological effect, from the economical point of view, is obtained by bottom sediment removal on the about 1 km sectors over each of the sluice.

The results of the first (since 1939) hydrochemical investigations of Gliwice Channel have been presented. The polluted K.lodnica River affects bad water quality of the canal. For example the concentrations of chlorides (Cl), sulfates (S04), sodium (Na), potassium (K), conductivity and dissolved substances quality of water is out of standards. In the case of BOD and COD the water quality is changed from out of classes to II class. pH and oxygen concentration are in I class. Although no salinity waters flow into the canal, the water quality get improved slightly only. The decrease of pollutants concentration is related to theirs dispersion. In the case of water quality the self-purification processes are of secondary importance.

In 1999, in comparison to 1979, oxygen conditions in the Przemsza River improved. The maximal concentrations of BOD decreased about 20 times, whereas minimal concentrations from 3 to 10 times. On the basic changes of COD it was found that the quantity of recalcitrant pollutants is the same as 10 years ago, the salinity of water is also the same. The volume of ammonia and nitrites has decreased. The probable cause of decrease of nitrates was the reduction of fertilisers levels in the basin area of the Przemsza River. The suspended solids concentrations in the water are abatemanted. The water quality of the river gets worse along the river, coupe especially near the towns of Mysłowice and Jelen.