Wastewater

Voda je najrasprostranjenija kapljevina na Zemlji, ali unatoč toj činjenici, i dalje smo suočeni sa problemom nedostatka pitke vode u nekim dijelovima svijeta. Pitke vode su sve više zagađene otpadnim vodama. Obzirom na ubrzani ekonomski razvoj i urbanizaciju, raste i količina otpadne vode, što dovodi do zastrašujućih podataka da godišnje od trovanja otpadnim vodama umre 842 tisuće ljudi. Pojam otpadne vode obuhvaća sve vode koje su upotrebom promijenile svoj prvobitni sastav, odnosno svoje fizikalne, kemijske ili biološke karakteristike. Kroz ovaj rad ću Vam iznijeti podjelu, svojstva, kao i izvore zagađenja otpadnih voda. Posebno ću objasniti pročišćavanje istih kroz četiri stupnja (prethodno pročišćavanje, I stupanj pročišćavanja, II stupanj pročišćavanja te III stupanj pročišćavanja), kao i zakonsku regulativu vezanu za otpadne vode te njihovo ispuštanje.Water is the most widespread liquid on Earth, but despite this fact, we've been still faced with the problem of lack of drinking water in some parts of the world. Drinking water is increasingly polluted with wastewaters. Given the accelerated economic development and urbanization, the amount of wastewater increases, leading to frightening data that annually 842,000 people die from wastewater poisoning. The term wastewater includes all waters that have changed their original composition or their physical, chemical or biological characteristics by using them. Through this paper I will present the division, properties, and sources of wastewater pollution. In particular, I will explain the purification of these in four stages (pre-purification, I stage of purification, II stage of purification and III stage of purification) as well as the legal regulations related to waste water and their discharge