What is the environmentally sound treatment technology for arsenic-containing soot?

　　Arsenic is a highly toxic substance, and soluble arsenic compounds are extremely harmful to human and animal life safety and the environment. Some industrial enterprises will produce wastewater containing arsenic, which must be strictly treated to meet national emission standards before discharge. So, what is the harmless treatment technology of arsenic-containing soot?

　　What is the harmless treatment technology of arsenic-containing soot?

　　1, arsenic slag and the second arsenic removal slag contain a large amount of water, the concentration of arsenic in this part of the water is balanced with the arsenic in the precipitation during the chemical reaction of arsenic removal. Theoretically, the concentration of arsenic in the water contained in the first arsenic removal slag can reach below 2.5 mg/l.

　　2, in addition to arsenic slag contained in the "water" in the concentration of arsenic can reach less than 1mg / L, and used to identify the toxicity of very dilute acid leaching method, in fact, only leaching solid sediments in the "water" contained in this part of the arsenic. Therefore, in addition to arsenic, as long as the concentration of arsenic in the filter residue is less than the "standard", it can ensure that the arsenic residue leachate does not exceed the standard.

　　How many milligrams of arsenic-containing waste containing arsenic soot is the emission standard?

　　1, China's arsenic-containing waste stability evaluation: the high permissible mass concentration of arsenic in surface water is 0.04mg / L, the daily average high permissible mass concentration of arsenic compounds in the air in residential areas is 0.003m g / m industrial "three wastes" emission pilot standards, arsenic and its inorganic compounds of the high permissible mass concentration of 0.5mg / L. /liter.

　　2. Currently, most countries use the U.S. Environmental Protection Agency's "Toxicity Characterization Procedure Experiment" for testing. Hazardous solid waste is mixed with acetate buffer solution at pH 5 with a liquid to solid volume ratio of 101 and reacted at a stirring intensity of 30r/min for 20 hours. After liquid-solid separation, the concentration of hazardous elements in the leachate was analyzed. when the arsenic content in the leachate of arsenic-containing materials was higher than 5m‖L after the TcLP experiment, the arsenic-containing waste had to be treated and could not be discharged directly.

　　What are the symptoms of arsenic containing fumes with arsenic content exceeding the standard?

　　1, warty skin: arsenic poisoning can cause a variety of skin damage, including hyperkeratosis, hyperpigmentation and warty hyperplasia. This paper analyzes and studies the effects of arsenic on human skin and proposes some protective measures.1 Effects of arsenic on the skin 1.1 Changes in skin epidermal structure Under normal conditions, epidermal cells are in a relatively stable state. Among them, skin pigmentation can occur in various parts of the body. There will be patchy and raindrop pigmentation, mostly seen in the thighs, limbs and trunk.

　　2、Hair loss: Hair loss is a common phenomenon, but hair loss is also a symptom of arsenic poisoning, especially chronic arsenic poisoning, which can cause damage to the skin and thus affect the health of hair follicles. Therefore, if hair loss is severe and accompanied by other symptoms of arsenic poisoning, be alert to hair loss caused by arsenic poisoning.

　　3, dark face: arsenic poisoning will also be manifested as a dull face, dull skin mainly because of the high level of arsenic in the human body. Because epidermal keratin contains sulfhydryl groups, combined with arsenic sulfhydryl group activity is inhibited, tyrosinase activity is enhanced, so that a large number of melanin, skin pigmentation changes, usually manifested as skin pigmentation and pigmentation loss.