The Nitrogen Fertilizer Value of Selected South African Biosolids as Affected by Drying Depth on Beds

IF 2.1 Q3 ENVIRONMENTAL SCIENCES

Journal of Sustainable Development of Energy Water and Environment Systems-JSDEWES Pub Date : 2021-06-01 DOI:10.13044/j.sdewes.d8.0361

E. Tesfamariam, Elvis M. Malobane, C. Cogger, I. Mbakwe

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Abstract

Wastewater treatment and post-treatment drying techniques play crucial role on the fertiliser value of biosolids. The aim of this study was to investigate a) the nitrogen fertilizer value of biosolids from selected biosolid treatment and post treatment dewatering techniques b) the effect of drying depth and time on the nitrogen content of biosolid. To achieve the first aim, laboratory nitrogen mineralization study was conducted using thermally-hydrolysed-biosolid, activated-biosolid, and anaerobicallydigested-biosolids. To achieve the second aim five drying depths were tested (5, 10, 15, 20 and 25 cm). Nitrogen release per tonne biosolid applied was highest for activated (24 kg), and lowest for anaerobically-digested-biosolid (6 kg). Highest total nitrogen was reported for 10 cm drying depth (3.63%) (4 weeks) and lowest for 25 cm (2.64%) (8 weeks). Selection of appropriate biosolid treatment and dewatering technique is key to improve fertiliser value of biosolids.

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选定的南非生物固体的氮肥价值受床上干燥深度的影响

废水处理和后处理干燥技术对生物固体的肥料价值起着至关重要的作用。本研究的目的是研究a）选定的生物固体处理和处理后脱水技术中生物固体的氮肥价值；b）干燥深度和时间对生物固体氮含量的影响。为了实现第一个目标，使用热水解生物固体、活化生物固体和厌氧消化生物固体进行了实验室氮矿化研究。为了实现第二个目的，测试了五个干燥深度（5、10、15、20和25cm）。每吨施用的生物固体的氮释放量最高的是活化的（24kg），最低的是厌氧消化的生物固体（6kg）。据报道，10厘米干燥深度（3.63%）（4周）的总氮最高，25厘米干燥深度最低（2.64%）（8周）。选择合适的生物固体处理和脱水技术是提高生物固体肥料价值的关键。

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

Journal of Sustainable Development of Energy Water and Environment Systems-JSDEWES ENVIRONMENTAL SCIENCES-

CiteScore

5.40

自引率

9.50%

发文量

审稿时长

20 weeks

期刊介绍： The Journal of Sustainable Development of Energy, Water and Environment Systems – JSDEWES is an international journal dedicated to the improvement and dissemination of knowledge on methods, policies and technologies for increasing the sustainability of development by de-coupling growth from natural resources and replacing them with knowledge based economy, taking into account its economic, environmental and social pillars, as well as methods for assessing and measuring sustainability of development, regarding energy, transport, water, environment and food production systems and their many combinations.