The purpose of adding aluminum sulfate and other fluorine removal treatment is to make the fluorine content in the wastewater reach the standard and avoid fluorine pollution or excessive intake of fluorine by human body to produce fluorine poisoning.Fluorosis can form deposits on teeth and bones and can cause loss of appetite, dizziness, headaches and memory loss.Aluminum sulfate defluorination is carried out through its adsorption precipitation and complex precipitation.In the way of PH regulation, aluminum sulfate is used to treat fluorine-containing wastewater by using the principle of neutralization and symbiotic precipitation. Arsenic and fluorine, etc.,produce precipitation at the appropriate PH value, and thus get separated from the water.
On the other hand, aluminum hydroxide colloid formed by dissolving aluminum sulfate in water has adsorption and precipitation effect on small suspended solid particles in water, and aluminum ion can react with it by electroneutralization.The first is the treatment of fluorine-polluted wastewater. In the traditional treatment method, we put calcium salt into the sewage, but the precipitation rate is slow, and the single use will increase the cost of treatment.But when aluminum sulfate is added without iron, the effect is quite different.Its main role is chemical precipitation, adsorption of pollutants or flocculant treatment, and greatly reduce the fluorine content in sewage.Precipitation method, only applicable to high fluorine content of sewage treatment;For low fluorine, like drinking water, we use adsorption.Commonly, chemical precipitation method is used first, and aluminum sulfate is treated with adsorbent or flocculant to reduce the fluorine content to 10 mg/L or less.
The second is the treatment of heavy metal wastewater.The methods of heavy metal wastewater treatment include neutralization and precipitation method, sulfonate method, ferrate method, resin method, etc.Ferric sulfate – free precipitation is also one of the most commonly used.Aluminum sulfate without iron also has the role of adsorption and deposition of heavy metal wastewater, which is also the way of sewage treatment in many enterprises.In order to improve the fluoride removal effect, some coagulants and regulators, such as lime and polyacrylamide, can be added in the wastewater.
Post time: Jun-28-2019