Khảo sát ảnh hưởng của tải lượng hữu cơ đến quá trình phân hủy kỵ khí hai pha chất thải rắn sinh hoạt hữu cơ=Investigation of the effect of organic loading rates on the two-phase anaerobic digestion of biodegradable municipal solid waste

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Tác giả: Thọ Bách Lều, Phú Gia Nguyễn, Văn Định Phạm, Công Khánh Trần, Thanh Liêm Trần

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học công nghệ xây dựng (Đại học Xây dựng Hà Nội), 2024

Mô tả vật lý: tr.174-182

Bộ sưu tập: Metadata

ID: 241694

Thêm vào giỏ

Mục tiêu nghiên cứu này là khảo sát ảnh hưởng tải lượng hữu cơ (OLR) của chất nền đến hệ thống phân hủy hai pha (TAD) chất thải rắn sinh hoạt hữu cơ. Hệ thống TAD bao gồm một bể thủy phân (HR) và một bể Mêtan (MR). Chất thải rắn hữu cơ được thủy phân trong bể HR ở điều kiện pH 6,5 với thời gian lưu 5 ngày. Sau đó, thành phần dịch thủy phân được tách khỏi chất nền và bơm vào bể Mêtan (MR) với các tải lượng 1,6-9,5 kg-COD/(m3.ngđ). Các bể phản ứng được duy trì ở nhiệt độ ấm (36-37 C). Ở bể HR, dịch thủy phân thu được có sản lượng đạt 1,26 g-COD/g-VS với tỉ lệ SCOD/TCOD = 0,63. Thành phần COD của VFAs (sản lượng 0,4 g-VFAs/g-VS) chỉ chiếm 74% so với SCOD, chứng tỏ 26% cơ chất đã bị thủy phân nhưng chưa thể chuyển hóa thành axit bay hơi ngắn mạch. Ở bể MR, sự gia tăng về tải lượng hữu cơ làm giảm hiệu suất của quá trình chuyển hóa. Tải lượng 6,45 kg-COD/(m3.ngđ) được coi là điểm tới hạn về tải lượng để có hiệu suất hoạt động cao. Tại đây, hệ thống đạt được sản lượng khí 358,6 Nml/g-COD với 69,6% CH4 và hiệu suất loại bỏ chất hữu cơ tính theo COD đạt >
95%. Khi OLR vượt quá điểm tải lượng này thì có sự suy giảm nhanh chóng về chất lượng khí, sản lượng khí và khả năng loại bỏ chất hữu cơ.The objective of this study is to investigate the effect of organic loading rates (OLR) of the substrate on the twostage anaerobic digestion (TAD) of biodegradable municipal solid waste (BSW). The TAD system contained one hydrolysis tank (HR) and one methane reactor (MR). The BSW was hydrolyzed in the HR at pH 6.5 condition with a retention time of 5 days. The liquid hydrolysate component was then separated from the substrate and pumped into the MR with an OLR in the range of 1.6-9.5 kg-COD/(m3.ngd). The reactors were maintained at a temperature of 36-37 C. In the HR tank, the liquid hydrolysate had a yield of 1.26 g-COD/g-VS with the ratio SCOD/TCOD = 0.63. The COD of VFAs (yield of 0.4 g-VFAs/g-VS) accounted for only 74% of total SCOD, showing that 26% of the substrate was hydrolyzed but could not be converted to VFAs. In the MR tank, an increase in organic load reduces the efficiency of the conversion process. A load of 6.45 kg-COD/(m3.ngd) is considered the critical load point for high performance. Here, the system achieves a gas output of 358.6 Nml/g- COD with 69.6% CH4 and a COD removal efficiency of >
95%. When the OLR exceeds this point, there is a sharp decline in biogas quality, biogas quantity, and COD removal.

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