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How many kg of bleaching powder is needed per day to chlorinate 4 MLD of water so than, after 40 minutes of contact, there remains residual chlorine of 0.25 mg/l. The input water has a chlorine demand of 1.25 mg/l. And that the bleaching powder has only 25% available chlorine. 
Look at the chlorine residual data during chlorination of wastewater which consists of ammonia, organic matter, and microorganisms. Chlorine dosage (mg/L) 0.1 0.5 1.0 1.5 2.0 2.5 Chlorine residual (mg/L) 0.0 0.4 0.8 0.4 0.9 1.4 Calculate chlorine dose at the breakthrough point
An aqueous solution with chlorine 30 g/L and an organic compound with no chlorine at the rate 50 L/min were put into an extraction machine and produced aqueous solution with chlorine 5 g/L and organic compound with chlorine 10 g/L, what is the rate of aqueous solution?
How much bleaching powder (having 20% available chlorine) is needed to disinfect 10,000 litres of water whose chlorine demand is 1.0 mg/l? It should  be ensured that, after about 1 hour contact time, 0.2 mg/l chlorine is available.
Consider the following statements in respect of injecting chlorine between rapid sand filter and storage tank: 1. More contact time is available. 2. Chlorine demand is reduced. 3. NHCl2 is formed which is more effective than residual chlorine. 4. Break point chlorination takes place. Which of the above statements are correct?
In a swimming pool, water and chlorine is mixed in which chlorine is 15% and water is 170 litres, what quantity of chlorine should be added in the swimming pool to make it 32% of the total weight of the swimming pool?
Given below are three quantities named A, B and C. Based on the given information, determine the relation among the three quantities. Quantity A∶  A 30 litre mixture of wine and water has wine and water in the ratio 5∶ 7. How much water must be drawn off so that the ratio of wine and water becomes 25∶ 19? Quantity B∶ A 35 litre mixture of wine and water has wine and water in the ratio 1∶ 3. How much water must be drawn off so that the ratio of wine and water becomes 1.75∶ 3.35? Quantity C∶ A 27 litre mixture of wine and water has wine and water in the ratio 3∶ 2. How much water must be drawn off so that the ratio of wine and water becomes 81∶ 11?
Consider the following statements in connection with daily per capita demand value of water supply. S1: Per capita demand for big cities is generally small when compared to that for small towns. S2: Industrial and commercial activities of a city increases the per capita demand of water. S3: Fixed monthly rate policy of water use charging has more per capita demand when compared to charging based on actual meter reading. Identify the correct statement (s).
when demand for factory's products is high . more money is spent at the factory for safety precautions and machinery maintenance than when demand is low. thus the average number of on -the-job accidents per employee each month should be lower during perids when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance .when demand for its products is high, casts the most serious doubt on the conclusion drawn above?
When demand for a factory's products is high, more money is spent at the factory for safety precautions and machinery maintenance than demand is low. Thus the average number of on-the-job accidents per employee each month should be bower during periods when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance. Which of the following,if true about a factory when demand for its product is high casts the most serious doubt on the conclusion drawn above?