Biodegradability index (BDI) as an indicator for effluents quality measurement; a case study based on different industry sectors in Matara District, Sri Lanka

Water Practice & Technology Pub Date : 2024-07-13 DOI:10.2166/wpt.2024.183

Rashmitha Diwyanjalee Garusinghe, B. K. A. Bellanthudawa, D. K. N. S. De Silva, A. R. Gunawardena

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Abstract

This study addresses the crucial need for appropriate indicators to characterize aquatic pollution, given the challenges posed by unrestricted effluent discharge globally. Focusing on wastewater from hotel and tourism industries and vehicle service stations in Matara District, Sri Lanka, we explored the relationship between biological oxygen demand (BOD) and chemical oxygen demand (COD) through the biodegradability index (BDI). Monthly water samples were collected from January 2019 to December 2022, analyzed using standard methods, and statistically evaluated. Results revealed a significant spatial variation in BDI among industry sites, with a modest temporal change. The BOD:COD ratio exhibited a slight increasing trend over time, suggesting factors beyond temporal influence. BDI correlated significantly with temperature, alkalinity, and total suspended solids (TSS), emphasizing its potential as an indicator. The study underscores the importance of complementing the BOD:COD ratio with other indicators for a comprehensive assessment of industrial effluent quality. This research contributes valuable insights into understanding wastewater characteristics, facilitating informed pollution reduction and control strategies in aquatic systems.

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将生物降解指数（BDI）作为衡量污水质量的指标；基于斯里兰卡马塔拉地区不同工业部门的案例研究

鉴于全球范围内无限制的污水排放所带来的挑战，本研究解决了对描述水生污染特征的适当指标的关键需求。我们以斯里兰卡马塔拉地区酒店、旅游业和汽车服务站的废水为重点，通过生物降解指数（BDI）探讨了生物需氧量（BOD）和化学需氧量（COD）之间的关系。从 2019 年 1 月至 2022 年 12 月，我们每月采集水样，采用标准方法进行分析，并进行统计评估。结果显示，各工业点之间的 BDI 存在明显的空间差异，时间变化不大。随着时间的推移，BOD:COD 比值呈现出轻微的上升趋势，这表明时间影响之外还有其他因素。BDI 与温度、碱度和总悬浮固体 (TSS) 有明显的相关性，强调了其作为指标的潜力。这项研究强调了在全面评估工业废水质量时用其他指标补充 BOD:COD 比率的重要性。这项研究为了解废水特性提供了宝贵的见解，有助于在水生系统中采取明智的污染减排和控制策略。

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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Water Practice & Technology

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