Scholarlink

<p>Sewage sludge (SS), a nutrient-rich byproduct of wastewater treatment, is particularly valuable for agricultural reuse because it contains high levels of essential macronutrients such as nitrogen (N), phosphorus (P), and potassium (K). However, it requires stabilization due to its organic and contaminant load, and little attention has been paid to sludge-type-specific dosing strategies in composting. This study investigated the effect of quicklime (CaO) on nitrogen dynamics and macronutrient retention during in-vessel co-composting of SS with municipal solid waste (MSW). Twelve treatments were tested by combining three sludge types—primary, secondary, and a 1:1 mixture—with three CaO doses (1%, 2%, and 3%) and an unamended control. Results showed that 2% CaO was optimal for primary and mixed sludge, while 3% performed best for secondary sludge. These treatments achieved high nitrate concentrations (3.25–3.47&#xa0;g NO₃⁻-N/kg) and low NH₄⁺-N/NO₃⁻-N ratios (&lt; 0.1), indicating enhanced nitrification. Nitrogen losses remained moderate (31–38%), suggesting effective stabilization. CaO also accelerated thermophilic activity (T &gt; 50&#xa0;°C for ≥ 7 days) and improved final concentrations of nitrogen, phosphorus, and potassium. These findings demonstrate that the optimal lime dose is sludge-type-specific, highlighting a novel dosing strategy that enhances compost quality, improves nutrient recovery (N, P, and K), and ensures environmental safety in SS-based composting systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Quicklime-Assisted Nutrient Recovery During In-Vessel Co-Composting of Sewage Sludge and Municipal Solid Waste

  • 期刊论文

  • 发表日期：

    2025年9月13日

查看全文
  • Meghdad Pirsaheb,
  • Hiwa Hossaini,
  • Hooshyar Hossini,
  • Jila Amini

摘要

Sewage sludge (SS), a nutrient-rich byproduct of wastewater treatment, is particularly valuable for agricultural reuse because it contains high levels of essential macronutrients such as nitrogen (N), phosphorus (P), and potassium (K). However, it requires stabilization due to its organic and contaminant load, and little attention has been paid to sludge-type-specific dosing strategies in composting. This study investigated the effect of quicklime (CaO) on nitrogen dynamics and macronutrient retention during in-vessel co-composting of SS with municipal solid waste (MSW). Twelve treatments were tested by combining three sludge types—primary, secondary, and a 1:1 mixture—with three CaO doses (1%, 2%, and 3%) and an unamended control. Results showed that 2% CaO was optimal for primary and mixed sludge, while 3% performed best for secondary sludge. These treatments achieved high nitrate concentrations (3.25–3.47 g NO₃⁻-N/kg) and low NH₄⁺-N/NO₃⁻-N ratios (< 0.1), indicating enhanced nitrification. Nitrogen losses remained moderate (31–38%), suggesting effective stabilization. CaO also accelerated thermophilic activity (T > 50 °C for ≥ 7 days) and improved final concentrations of nitrogen, phosphorus, and potassium. These findings demonstrate that the optimal lime dose is sludge-type-specific, highlighting a novel dosing strategy that enhances compost quality, improves nutrient recovery (N, P, and K), and ensures environmental safety in SS-based composting systems.