KẾT QUẢ NGHIÊN CỨU BƯỚC ĐẦU VỀ XỬ LÝ NƯỚC THẢI CHỨA PB2+ Và CD2+ TỪ CÁC PHÒNG THÍ NGHIỆM HÓA HỌC

Trịnh Quang Huy¹

¹và nhóm nghiên cứu Bộ môn CN-MT, Khoa Đất và Môi trường, Trường Đại học Nông nghiệp I

Từ khoá: kết quả, nghiên cứu, xử lý, nước thải, Pb²⁺ và Cd²⁺, phòng thí nghiệm

Summary

The initial research results on the waste water treatment containing Pb²⁺ and Cd²⁺ from chemical labs

Natural zeolite contained a complement of exchangeable Na, K, and Ca ions but exposing them to 2M NaCl solution at 22 and 70oC, converted them to a near homoionic state in Na-form. Results: adsorbing behaviors of Pb²⁺ and Cd²⁺ on both of natural zeolites and treated zeolites were attached on the surface of mineral by difference ion exchange process. While ion exchange process, larger part of ion Pb and Cd moved to pores in mineral surfaces. Other part exchanged with cations such as Na, Ca, and Mg by replacement mechanism. The diffusion was high for the beginning and then gradually decrease. Pb and Cd removal results using natural zeolites and treated zeolites showed that treatment improved both the exchange capacity and the removal efficiency in the range of waste water concentration containing 1 mmol/l of Pb²⁺ and Cd²⁺. Removal efficiency is 95% and 99% for Pb and Cd respectively.