The Milkmaid (Vermeer) van Leyden's engraving "The Milkmaid" (1510) and Jacques de Gheyn II's engraving "The Archer and the Milkmaid" (about 1610). Vermeer's painting is even more understated, although the use of symbols remains: one of the Delft tiles at the foot of the wall behind the maid, near the foot warmer, depicts Cupid – which can imply arousal of a woman or simply that while she is working she is daydreaming about a man. Other amorous symbols in the painting include a wide-mouthed jug, often used as a symbol of the female anatomy. The foot warmer was often used by artists as
Produced water waters. Although beneficial reuse for drinking water and agriculture have been researched, the industry has not adopted these measures due to cost, water availability, and social acceptance. Gravity separators, hydrocyclones, plate coalescers, dissolved gas flotation, and nut shell filters are some of the technologies used in treating wastes from produced water. Produced water Produced water is a term used in the oil industry to describe water that is produced as a byproduct along with the oil and gas. Oil and gas reservoirs often have water as well as hydrocarbons, sometimes in a zone that lies under the hydrocarbons, and sometimes