Â­TÂ­here are many different ways to create a motion sensor. For example: 1  It is common for stores to have a beam of light crossing the room near the door, and a photosensor on the other side of the Â­room. 2  When a customer breaks the beam, the photosensor detects the change in the amount of light and rings a bell.
Definition of weir. 1  1 : a fence or enclosure set in a waterway for taking fish. 2  2 : a dam in a stream or river to raise the water level or divert its flow.
Abstract â The pulp and paper mill effluent is one of the high polluting effluent amongst the effluents obtained from polluting industries.All the available methods for treatment of pulp and paper mill effluent have certain drawbacks.The coagulation is one of the cheapest process for treatment of various organic effluents. Thus, the removal of chemical oxygen demand (COD) and colour of paper mill effluent is studied using coagulation process. ATERIALS AND METHODS A.Effluent Black liquor was obtained from a local integrated kraft pulp and paper mill. This liquor was having a COD of about 7 x 10 5 mg l -1. Synthetic wastewater was prepared by diluting this black liquor with distilled water to obtain a COD value of about 7000 mg l -1.