What is a pH neutralization system?
pH neutralization systems are used to treat high acidic or high alkaline industrial wastewater. pH adjustment in water treatment can be accomplished in either a batch or continuous flow pH neutralization system.
What type of controller would you recommend for control of pH level in a liquid?
A closed loop PID Controller The controller may have different structures. Different design methodologies are there for designing the controller in order to achieve desired performance level. But the most popular among them is Proportional-Integral-derivative (PID) type controller.
Why is controlling the pH of a process difficult?
However, it is difficult to control pH process with adequate performance due to its severe nonlinearity, sensibility to small disturbance and time varying characteristics. Hence, more reliable, accurate, efficient and flexible control techniques are required for pH neutralization.
What is a chip tank?
The chip tank has an inlet fitting and downpipe to direct influent to the bottom of the tank. The tank is filled almost to the top with limestone chips and the influent percolates up through the chip bed until it reaches the overflow fitting on the opposite side of the tank.
What is a pH system?
pH is a measure of how acidic/basic water is. The range goes from 0 – 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
What is neutralization in wastewater treatment?
The aim of neutralisation is to modify an acid or base water flow to a neutral pH (approximately 7). The most important objectives are to make the wastewater treatable using biological purification and/or make it comply with discharge criteria.
What chemicals are used to adjust pH?
To raise the pH of an acidic liquid, sodium carbonate (soda ash), ammonium hydroxide, calcium hydroxide (lime) or magnesium hydroxide can also be used. To lower the pH of a base liquid, phosphoric acid, hydrochloric acid (HCI), nitric acid or carbon dioxide can be used, in addition to sulfuric.
Why it is necessary to control pH of a system?
The pH can control the availability of nutrients, biological functions, microbial activity, and the behavior of chemicals. Because of this, monitoring or controlling the pH of soil, water, and food or beverage products is important for a wide variety of applications.
How can the pH of a solution be controlled?
pH control is achieved by the addition of buffers. The theory of buffers is a common part of physical chemistry. Buffers are necessary to adjust and maintain the pH. These can be salts of a weak acid and a weak base.
What is neutralization tank?
Neutralization tanks are used to alter the pH level of corrosive waste drainage—by dilution or chemical neutralization—so the treated effluent can be safely discharged into sanitary sewer systems in compliance with local regulations. A range of smaller point-of-use or larger centralized tanks are available.