Method for preparing composite coagulant used for treating slightly polluted raw water

Abstract

The invention discloses a method for preparing a composite coagulant used for treating slightly polluted raw water, which comprises: grinding attapulgite clay raw ore into fine powder, and sieving the fine powder with a 100 to 300-mesh sieve to obtain attapulgite clay powder; roasting the attapulgite clay powder at 350 to 500 DEG C for 1 to 5 hours or irradiating the attapulgite clay powder at a microwave power of 300 to 600W for 5 to 15 minutes and obtaining modified attapulgite clay; and mixing the modified attapulgite clay with inorganic coagulant in an amount which is 1 to 20 weight percent based on the weight of the modified attapulgite clay in aqueous solution, stirring to disperse the modified attapulgite clay and the inorganic coagulant uniformly, drying, and milling into fine powder to obtain the finished composite coagulant. The method has the advantages of making operation simple, realizing high adaptability, achieving high removal rate and settling speed, ensuring small sludge volume and small dosage of inorganic medicament, reducing inorganic medicament residue, improving chemical and biological safety, along with low cost and the like, and thus is a novel, environmentally-friendly and high-efficiency coagulant for water treatment plants to perform coagulation enhancing modification of the conventional process.

Description

technical field [0001] The invention relates to the technical field of water supply treatment, in particular to a method for preparing a composite coagulant for slightly polluted raw water treatment. Background technique [0002] Due to factors such as urbanization, industrialization and eutrophication, the pollution of water sources is becoming more and more serious. At the same time, with the improvement of living standards, the standard of drinking water quality is also constantly improving. However, most of the water plants in our country still use the conventional process of "coagulation-sedimentation-filtration-disinfection" to produce drinking water. Although it plays an important role in ensuring the quality of drinking water, it cannot effectively remove the Micro-pollution problems such as trace soluble organic pollutants, chlorinated organic compounds in the disinfection process, nutrient-rich ammonia nitrogen, and algae. Changing dosing methods, dosing condition...

AI Technical Summary

Problems solved by technology

At present, researchers have made useful explorations on the application of attapulgite in water treatment as a natural and cheap adsorbent, but its application in the enhanced treatment of slightly polluted raw water has not been reported yet.

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