A method for treating nickel-containing wastewater by using composite adsorbent

Abstract

The invention discloses a method for treating nickel-containing wastewater by using a composite adsorbent, comprising: mixing the nickel-containing wastewater with the composite adsorbent, shaking at room temperature, separating solid and liquid to obtain wastewater for primary treatment, and adjusting its pH value to 4- 5. Add sodium hypochlorite to stir the reaction, add composite adsorbent to vibrate at room temperature, and obtain secondary treatment wastewater after solid-liquid separation; adjust the pH value of the secondary treatment wastewater to 10.5-11.5, let it stand for precipitation, take the upper liquid and add polymerization chlorination Aluminum was stirred, then polyacrylamide was added to stir, and after standing still and solid-liquid separation, three times of treated wastewater were obtained; the three times of treated wastewater was mixed with a composite adsorbent, and solid-liquid separation was performed after shaking at room temperature; the composite adsorbent was made of modified seawater The foam stone, acid-modified fly ash and cross-linked chitosan are uniformly mixed. The method for treating nickel-containing waste water with a composite adsorbent proposed by the invention has a simple process, has better treatment effects on various forms of nickel in the water body, and has a high nickel removal rate.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating nickel-containing wastewater by using a composite adsorbent. Background technique [0002] Nickel is one of the widely used and expensive heavy metal elements. In recent years, it has been widely used in electroplating, electronics, alloys, steel, catalysts and other fields. These fields will discharge a large amount of nickel-containing wastewater. Nickel and its compounds in nickel-containing wastewater are highly toxic substances. In the field of wastewater treatment, nickel-containing wastewater belongs to high-concentration and refractory toxic wastewater. Improper treatment will not only cause waste of nickel metal resources, but also It is easy to produce secondary pollution and can enter the human body through the food chain, causing serious harm to the human body. Therefore, according to the regulations of the environmental protection d...

AI Technical Summary

Problems solved by technology

Although there are many methods for treating nickel-containing wastewater, including chemical methods, electrolysis methods, and physical isolation and filtration methods, the existing treatment methods generally have the defects of complicated operation process and low removal rate of nickel metal.