Chemical adsorbent for processing heavy metal waste water

Abstract

The invention provides a chemical adsorbent for processing heavy metal waste water. The Chemical adsorbent for processing heavy metal waste water comprises the following components in parts by mass: 5to 25 parts of calcium oxide, 15 to 40 parts of an inorganic polymer flocculant, 1 to 25 parts of sulfur-containing iron powder, 3 to 30 parts of sodium percarbonate, and 1 to 10 parts of an organicpolymer flocculant. The adsorbent of the invention is simple to use and operate, the conditions are easy to control, the dosage of the medicament is small, and the sedimentation speed is fast.

Description

technical field [0001] The invention relates to a chemical adsorbent for treating heavy metal wastewater and its application. Background technique [0002] In recent years, due to the rapid development of industry, the problem of water pollution has become one of the focal issues concerned by all walks of life. Various heavy metal ions contained in wastewater will cause irreversible damage to the human body through the enrichment of the food chain. Heavy metal wastewater mainly comes from mine drainage, leaching water from waste rock yards, tailings drainage from mineral processing plants, dust removal drainage from non-ferrous metal smelters, pickling water from non-ferrous metal processing plants, washing water from electroplating plants, pickling drainage from iron and steel plants, etc. The types, contents and forms of heavy metal ions in wastewater change with the change of production process conditions. [0003] The heavy metals in wastewater cannot be decomposed and...

AI Technical Summary

Problems solved by technology

Among them, the solvent extraction method is a common method for separating and purifying substances, but the loss of solvent during the extraction process and the energy consumption in the regeneration process are relatively large, which limits its application; Although the membrane separation technology has good selectivity, strong adaptability, low energy consumption, and no chemical and Phase change and other advantages, but there are also problems such as easy clogging and scaling, which require regular cleaning and relatively high maintenance costs; the adsorption method for heavy metal wastewater treatment is simple, efficient, and has a variety of adsorbents. It is the most widely used heavy metal wastewater Approach

However, activated carbon is the most widely used adsorbent today. Although it has strong adsorption capacity and high removal rate of heavy metal ions, its regeneration efficiency is low, which limits its large-scale industrial application.

[0006] Biological treatment is a method of removing heavy metals in wastewater by means of flocculation, absorption, accumulation, and enrichment of microorganisms or plants, but its application conditions are relatively harsh and difficult to control, and most of them stay in the theoretical research stage

[0007] CN104828925A discloses a solid heavy metal wastewater treatment agent and its application method. Calcium hypochlorite is used as an oxidizing agent in its formulation. The treatment process requires auxiliary aeration to fully exert the oxidation effect, and aeration makes the cost relatively high; in addition, the Calcium hypochlorite in the patent is a solid powder, which will increase the concentration of suspended solids in the water after use, and its easy volatilization will also cause strong carcinogenicity, which is more harmful to operators

CN103803666A discloses a heavy metal wastewater treatment agent, but the amount of barium sulfide in its formula is relatively large, and barium sulfide is toxic and easy to corrode, and it will release H when it meets water. 2 S, H 2 S gas is also highly toxic, which is likely to cause personal injury to on-site personnel

CN103285809A discloses an adsorbent for adsorbing heavy metal ions and its preparation method, but its production process takes a long time, it needs high-temperature roasting, and the cost is high; in addition, its precipitation and adsorption process needs to use ammonia water, and ammonia water has certain Irritating, easy to cause injury to operators

CN104226233A discloses an adsorbent for removing heavy metals in water, which uses titanium salt and salt as raw materials, adjusts the pH to 4-10, and obtains the adsorbent after aging, but the raw material uses relatively expensive titanium salt, and the cost is relatively high