Photo wall hanging
It is a best out of waste made from tea cups(paper). I've made many such wall hangings to give presents to my friends on their birthdays. You can increase the size ( take big cup .ie. paper juice cup) And paste the family/friend pictures on the cups to decorate ur house. It's an ecofriendly decor.
WASTE WATER TREATMENT
Wastewater treatment is a process used to remove contaminants from wastewater or sewage and convert it into an effluent that can be returned to the water cycle with minimum impact on the environment, or directly reused. The latter is called water reclamation because treated wastewater can be used for other purposes. The treatment process takes place in a wastewater treatment plant, often referred to as a Water Resource Recovery Facility or a Sewage Treatment Plant. Pollutants in municipal wastewater are removed or broken down.