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Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation.
Waste Management ( IF 8.1 ) Pub Date : 2020-09-03 , DOI: 10.1016/j.wasman.2020.08.037
Fleuriane Fernandes 1 , Alla Silkina 1 , Claudio Fuentes-Grünewald 1 , Eleanor E Wood 1 , Vanessa L S Ndovela 1 , Darren L Oatley-Radcliffe 2 , Robert W Lovitt 2 , Carole A Llewellyn 1
Affiliation  

Digestate produced from the anaerobic digestion of food and farm waste is primarily returned to land as a biofertiliser for crops, with its potential to generate value through alternative processing methods at present under explored. In this work, valorisation of a digestate resulting from the treatment of kitchen and food waste was investigated, using dilution, settlement and membrane processing technology. Processed digestate was subsequently tested as a nutrient source for the cultivation of Chlorella vulgaris, up to pilot-scale (800L). Dilution of digestate down to 2.5% increased settlement rate and induced release of valuable compounds for fertiliser usage such as nitrogen and phosphorus. Settlement, as a partial processing of digestate offered a physical separation of liquid and solid fractions at a low cost. Membrane filtration demonstrated efficient segregation of nutrients, with micro-filtration recovering 92.38% of phosphorus and the combination of micro-filtration, ultra-filtration, and nano-filtration recovering a total of 94.35% of nitrogen from digestate. Nano-filtered and micro-filtered digestates at low concentrations were suitable substrates to support growth of Chlorella vulgaris. At pilot-scale, the microalgae grew successfully for 28 days with a maximum growth rate of 0.62 day−1 and dry weight of 0.86 g⋅L−1. Decline in culture growth beyond 28 days was presumably linked to ammonium and heavy metal accumulation in the cultivation medium. Processed digestate provided a suitable nutrient source for successful microalgal cultivation at pilot-scale, evidencing potential to convert excess nutrients into biomass, generating value from excess digestate and providing additional markets to the anaerobic digestion sector.



中文翻译:

评估营养丰富的消化物:稀释,沉降和膜过滤工艺,以优化作为微藻培养的废料培养基。

厌氧消化食物和农场废物产生的消化液主要作为农作物生物肥料返回土地,目前正在探索中,它有可能通过替代加工方法产生价值。在这项工作中,使用稀释,沉降和膜处理技术,对因处理厨房和食物垃圾而产生的消化液进行了增值研究。随后将加工后的消化液作为培养小球藻的营养来源进行了测试达到中试规模(800升)。消化液的稀释率降低到2.5%,增加了沉降速率,并诱导释放出用于肥料的有价值的化合物,例如氮和磷。作为消化物的部分处理,沉降以低成本提供了液体和固体部分的物理分离。膜过滤显示出有效的养分分离,微滤可回收92.38%的磷,微滤,超滤和纳滤的组合可从消化物中回收94.35%的氮。低浓度的纳滤和微滤消化物是支持小球藻生长的合适底物在中试规模,微藻成功生长了28天,最大生长速率为0.62天-1干重为0.86g·L -1。超过28天的培养物生长下降可能与培养基中铵和重金属的积累有关。加工后的消化物为成功进行中试规模的微藻培养提供了合适的营养来源,证明了将过量营养物转化为生物质的潜力,可以从过量消化物中产生价值,并为厌氧消化行业提供了更多的市场。

更新日期:2020-09-05
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