Characteristics of aquaculture sludge produced from two different fish diets and its impact on biogas production

IF 4.3 2区农林科学 Q2 AGRICULTURAL ENGINEERING

Aquacultural Engineering Pub Date : 2025-07-03 DOI:10.1016/j.aquaeng.2025.102597

Abhinav Choudhury, Christine Lepine, Michaela Hersom, Christopher Good

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Abstract

Assessing the feasibility of anaerobic digestion (AD) for treating recirculating aquaculture system (RAS) sludge requires understanding how fish diet changes affect waste characteristics and, subsequently, the AD process. In this study, sludge produced from RAS utilizing two fish diets (FA and FB) was anaerobically digested in batch reactors at 35 °C for 39 days. The two sludges differed in crude fat, chemical oxygen demand, total Kjeldahl nitrogen, total phosphorus, and volatile fatty acid concentrations. Normalized cumulative methane (CH₄) production was significantly higher for FB (346 ± 5 mL CH₄/g volatile solids [VS]) than FA (279 ± 4 mL CH₄/g VS), which could be attributed to FB’s higher crude fat content (27.4 ± 4.7 % compared to 12.2 ± 1.9 % for FA on a dry matter [DM] basis). However, the CH₄ production rate was higher for FA during the first 10 days of the study, with a maximum of 74.5 ± 1.8 mL CH₄/day on day 8, most likely due to the higher initial total VFA concentrations in FA (3.0 ± 0.2 g/L) compared to FB (2.0 ± 0.2 g/L). Sludge FB also increased peak hydrogen sulfide concentration (2763 ± 82 ppm). Elevated total ammonia nitrogen concentrations (> 3 g/L) were observed in both FA and FB treatments post-digestion due to the high crude protein content in the two sludges (> 30 % DM). The study showed that fish feeds with similar crude fat and protein content can result in different aquaculture waste characteristics, substantially impacting biogas production from AD.

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两种不同鱼类饲料产生的水产养殖污泥的特性及其对沼气产生的影响

评估厌氧消化（AD）处理循环水养殖系统（RAS）污泥的可行性需要了解鱼类饲料变化如何影响废物特性，以及随后的厌氧消化过程。在本研究中，利用两种鱼类饲料（FA和FB）在间歇反应器中厌氧消化RAS产生的污泥，温度为35°C，持续39天。两种污泥在粗脂肪、化学需氧量、总凯氏定氮、总磷和挥发性脂肪酸浓度方面存在差异。归一化累积甲烷(CH4)产量显著高于facebook(346 ±5  毫升CH4 / g挥发性固体(VS))比FA(279 ±4  毫升CH4 / g VS),这可能归因于FB更高的粗脂肪含量(27.4 ±4.7  % 12.2相比 ±1.9  %为足总干物质(DM)的基础上)。然而,甲烷产率较高的足总在第一次研究的10天,最多74.5 ±1.8  毫升CH4 /天8天,最有可能由于较高的初始总VFA浓度FA(3.0 ±0.2  g / L)相比,FB(2.0 ±0.2  g / L)。污泥FB也增加了硫化氢峰值浓度（2763 ± 82 ppm）。总氨氮浓度升高(>；3 g/L)，由于两种污泥中粗蛋白质含量较高(>；30 % DM)。研究表明，粗脂肪和粗蛋白质含量相近的饲料会导致不同的养殖废弃物特性，从而对AD产气产生重大影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Aquacultural Engineering 农林科学-农业工程

CiteScore

8.60

自引率

10.00%

发文量

审稿时长

>24 weeks

期刊介绍： Aquacultural Engineering is concerned with the design and development of effective aquacultural systems for marine and freshwater facilities. The journal aims to apply the knowledge gained from basic research which potentially can be translated into commercial operations. Problems of scale-up and application of research data involve many parameters, both physical and biological, making it difficult to anticipate the interaction between the unit processes and the cultured animals. Aquacultural Engineering aims to develop this bioengineering interface for aquaculture and welcomes contributions in the following areas: – Engineering and design of aquaculture facilities – Engineering-based research studies – Construction experience and techniques – In-service experience, commissioning, operation – Materials selection and their uses – Quantification of biological data and constraints