Industrial wastewater contains many pollutants. This book focuses on heavy metals found in textile effluents because of their known toxicity effect in the environment. Wastewater from a textile industry (UTEXRWA) in Rwanda has been screened for the occurrence of Cd, Cr, Cu, Pb, and Zn. Batch and pilot experiments on adsorption equilibrium, kinetics, and sulfide precipitation using volcanic rock as adsorbent and packing material have been investigated. A low cost and integrated system for treatment has been developed, combining an anaerobic bioreactor as the main treatment step, followed by a polishing step composed by a polishing pond containing algae, duckweed, and water hyacinth. More than 90% of metal removal was achieved in the bioreactor, with metal sulfide precipitation as long-term removal mechanism. The use of algae and duckweed as alternatives for water hyacinth plants showed no differences between algae and duckweed ponds based on abiotic differences. Overall, both systems' performance was close and these systems are well suited as a polishing step for wastewater containing low metal concentrations. The integrated system for heavy metal removal showed how two complementary systems for heavy metal removal can work in combination and good removal performance can therefore be achieved.
MY HOME AND NATIVE LAND is a story based on factual events, about the struggles of a young man growing up in a tribal family with a drug addiction environment. By the in family ignorance and under different circumstances he habitually was changed in behavior. Some events are based on real life of a native child. This is the story of Frances, as told by him. His life starts when he born in a tribal community of North America. His people have great Expectations for him to learn humility, and the value culture of the tribe, Frances tells the story of the other aspects of life in his community and family within invisible boundaries which could not make him a better child. He tells how much a child needs the care from his family to grown up a better human. His life as a foster child and how it affected his life is explored. He speaks of the pressure to use drugs and commit crimes to survive. Through his story he shows how the fake freedom of drugs and sex without restrictions or boundaries in families affects in the life of children and burns their soul.