Xử lý nước thải nhuộm tách dòng hay trộn dòng: ví dụ về quá trình keo tụ - tạo bông=Separated or Combined Treatment of Dye Wastewater Streams: A Case Study with Coagulation and Flocculation Process

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Tác giả: Thị Hoàng Oanh Lê

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Khoa học Trái đất và Môi trường, 2024

Mô tả vật lý: tr.98-105

Bộ sưu tập: Metadata

ID: 474325

Thêm vào giỏ

Nghiên cứu này so sánh điều kiện và hiệu quả xử lý nước thải nhuộm tách dòng và trộn dòng của quá trình keo tụ - tạo bông (CFP). Quá trình CFP dùng Poly Aluminium Chloride (PAC) làm chất keo tụ và chất nhầy tách chiết từ vỏ quả thanh long trắng (Hylocereus undatus) (DFPM) làm chất trợ keo tụ được nghiên cứu dựa theo mô hình Jar test. Điều kiện keo tụ tạo bông tương tự đối với 2 loại nước thải ở pH (4-7), thời gian lắng (30-60 phút), và liều chất trợ keo tụ (2-5 mg/L)
nhưng liều PAC tối ưu dành cho nước thải nhuộm tách dòng (330 mg/L) cao hơn rõ rệt so với nước thải nhuộm trộn dòng (260 mg/L). Hiệu quả xử lý tương tự cho 2 loại nước thải ở 2 chỉ tiêu TSS và độ đục
nhưng lại thấp hơn rõ rệt ở chỉ tiêu độ màu và COD đối với nước thải nhuộm tách dòng (78% và 68% so với 90% và 76%). Nghiên cứu đã cung cấp cơ sở khoa học cho việc lựa chọn tách dòng hay trộn dòng nước thải nhuộm khi xử lý bằng CFP.This study compared the treatment conditions and efficiencies of the coagulation and flocculation process (CFP) on mixed and separated dye wastewater. The CFP, which employed Poly Aluminium Chloride (PAC) as coagulant and mucilage extracted from the peel of dragon fruit (Hylocereus undatus) (DFPM) as flocculant, was investigated based on Jar-tests. The suitable coagulation and flocculation conditions were found similar at pH (4-7), settling time (30-60 min.), and flocculant dosage (2-5 mg/L) for both type of wastewaters. However, the optimal PAC dosage was determined to be significantly higher for separated dye wastewater stream (330 mg/L PAC) than for the mixed one (260 mg/L PAC) to ensure same treatment efficiencies. The treatment efficiencies were similar for TSS and turbidity of both wastewater types
However, much less for color and COD of separated dye wastewater stream in comparison to those of the mixed one (78% and 68% vs 90% and 76%, respectively). This study provides a scientific basis for the consideration of separated or combined treatment of dye wastewater streams by CFP.

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