Abstract: A method for removing arsenite and arsenate from water is provided. The method comprises reacting the water with cupric oxide (CuO) particles for a predetermined time and filtering the reacted water. A system for removing arsenite and arsenate from liquids is also provided.

Abstract: The present invention relates to methods for the rejuvenation of cupric oxide having adsorbed arsenic from arsenic contaminated water. The rejuvenated cupric oxide may be recycled to again react with and adsorb arsenic in arsenic contaminated water.

Abstract: An apparatus and two methods which quickly provides several perforations on a dough layer. An apparatus according to the invention includes a circular shaped top portion with its bottom surface having several measured threaded holes in a fixed pattern to provide grip for several nail like objects arranged in a fixed pattern. These nail like objects tips pointed either downwards or upwards means to provide perforations on a dough layer. Structure such as handles are provided to aid in lifting and pushing the tool during and after operation. Two corresponding methods of operations are also disclosed.