Bauer Torben, Pelkonen Markku, Lagerkvist Anders
Waste Science and Technology, Luleå University of Technology, Luleå, Sweden.
Environ Technol. 2022 May;43(12):1853-1859. doi: 10.1080/09593330.2020.1856937. Epub 2020 Dec 10.
This study uses a new approach for the recycling of plant nutrients by co-digesting sewage sludge with fly ash from a wood combustion. Sewage sludge and fly ash both are enriched with nutrients of the wastewater resp. wood, which makes these products an enhanced source for recycled fertilizers. The effects of the ash addition to the anaerobic digestion are studied in several lab scale experiments including effects on the gas production and microbial activity. Following that, the fertilizing qualities of the digestate are evaluated by plant growth experiments. The results show that the fertilizing qualities of the digested sludge were improved by the ash addition. Next to this, gas production results show that the methane production was not affected by the ash addition, while the total gas release was reduced. The sulphur addition by the ash stimulated sulphate reducing bacteria. The sulphate reducing bacteria did not markedly inhibit the methanogens.
本研究采用一种新方法，通过将污水污泥与木材燃烧产生的飞灰共同消化来回收植物养分。污水污泥和飞灰都富含废水（分别对应木材）中的养分，这使得这些产品成为回收肥料的优质来源。在多个实验室规模的实验中研究了添加飞灰对厌氧消化的影响，包括对气体产生和微生物活性的影响。随后，通过植物生长实验评估消化产物的施肥质量。结果表明，添加飞灰提高了消化污泥的施肥质量。除此之外，气体产生结果表明，添加飞灰不影响甲烷产生，但总气体释放量减少。飞灰添加的硫刺激了硫酸盐还原菌。硫酸盐还原菌并未显著抑制产甲烷菌。
