NGHIÊN CỨU XỬ LÝ ASEN TRONG NƯỚC NGẦM SỬ DỤNG XƠ MỤN DỪA HOẠT HÓA=STUDY OF ASENIC REMOVAL IN GROUNDWATER BY USING ACTIVATED COCONUT FIBER

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Tác giả: Thị Cẩm Vân Đỗ, Hương Quỳnh Phạm, Thị Mai Hương Phạm, Thị Thanh Yên Phạm

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học & Công nghệ - Trường Đại học Công nghiệp Hà Nội, 2024

Mô tả vật lý: tr.119

Bộ sưu tập: Metadata

ID: 119227

Thêm vào giỏ

Coconut husk has been discharged a great amount from coconut wholesales and retailers in Vietnam. This biomaterial is environmental friendly, available and recylable which are consisted of a multicellular fiber structure with a large surface area with many pores. Therefore, coconut fiber has high ability to absorb pollutants especially toxic heavy metals in water. In this study, the biosoption of modified coconut fiber was investigated for arsenic removal in underground water. The affecting factors on arsenic treatment efficiency including mass of NaOH-activated coconut fibers (NaACC), inlet arsenic concentration in groundwater, treatment time and pH of the solution media were evaluated. The results showed that the adsorption capacity of arsenic in groundwater was highest in the following conditions: 40g/l modified coconut fibers, initial arsenic concentration of 500 ppb, time at 72 hours reaching the maximum arsenic treatment efficiency about 15.5% at 72 hours treatment. In addition, pH adjusted to 12, it was obtanied 78% arsenic depletion. This result revealed that coconut fiber has the ability of arsenic adsorption, however, in order to improve the efficiency of arsenic treatment towards meeting national standards for domestic water supply, it is necessary to continue to expand research that can use this material combined with other materials to meet thê national current standard.Vỏ dừa là chất thải nông nghiệp phổ biến ở Việt Nam, hàng năm thải ra với số lượng lớn từ các cửa hàng kinh doanh sản phẩm dừa. Chất thải hữu cơ này thân thiện với môi trường, sẵn có và có thể tái chế do có cấu trúc vật liệu dạng sợi có nhiều lỗ rỗng trên bề mặt vật liệu, do vậy xơ dừa có khả năng hấp phụ rất tốt đối với các chất ô nhiễm đặc biệt là các kim loại trong môi trường nước. Trong nghiên cứu này, xơ mụn dừa được biến tính nhằm tăng khả năng hấp phụ sinh học để loại bỏ asen trong nước ngầm. Các yếu tố có thể ảnh hưởng tới hiệu quả xử lý asen được khảo sát bao gồm khối lượng của xơ mụn dừa hoạt hoá (NaACC), nồng độ asen ban đầu, thời gian xử lý và pH của môi trường. Kết quả cho thấy khả năng hấp phụ asen trong nước ngầm của vật liệu xơ mụn dừa đạt hiệu quả nhất trong điều kiện nồng độ xơ mụn dừa hoạt hoá sử dụng là 40g/L, nồng độ asen ban đầu không vượt quá 500ppb, thời gian xử lý tối ưu là 72 giờ có thể đạt hiệu quả xử lý lên tới 15,5%. Tuy nhiên khi điều chỉnh giá trị pH của môi trường nước ngầm lên tới 12 thì hiệu quả xử lý asen tăng đáng kể lên tới 78%. Kết quả này cho thấy vật liệu xơ mụn dừa có khả năng xử lý asen tuy nhiên để nâng cao hiệu quả xử lý asen hướng tới đạt quy chuẩn quốc gia về cấp nước sinh hoạt cần tiếp tục mở rộng nghiên cứu có thể sử dụng kết hợp với các vật liệu xử lý khác nhằm đạt tiêu chuẩn hiện hành trong nước.

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