CALAGUA - Unitat Mixta UV-UPV, Department D'Enginyeria Química, Universitat de València, Avinguda de La Universitat S/n, Burjassot, Valencia, 46100, Spain.
CALAGUA - Unitat Mixta UV-UPV, Department D'Enginyeria Química, Universitat de València, Avinguda de La Universitat S/n, Burjassot, Valencia, 46100, Spain.
J Environ Manage. 2021 Mar 1;281:111890. doi: 10.1016/j.jenvman.2020.111890. Epub 2020 Dec 29.
A pilot-scale microalgae (Chlorella spp.) and primary sludge anaerobic co-digestion (ACoD) plant was run for one year in an anaerobic membrane bioreactor (AnMBR) at 35 °C, 70 d solids retention time and 30 d hydraulic retention time, showing high stability in terms of pH and VFA concentration. The plant achieved a high degree of microalgae and primary sludge substrate degradation, resulting in a methane yield of 370 mLCH·gVS. Nutrient-rich effluent streams (685 mgN·L and 145 mgP·L in digestate and 395 mgNH-N·L and 37 mgPO-P·L in permeate) were obtained, allowing posterior nutrient recovery. Ammonium was recovered from the permeate as ammonia sulphate through a hydrophobic polypropylene hollow fibre membrane contactor, achieving 99% nitrogen recovery efficiency. However, phosphorus recovery through processes such as struvite precipitation was not applied since only 26% of the phosphate was available in the effluent. Composting process of the digestate coming from the ACoD pilot plant was assessed on laboratory-scale Dewar reactors, as was the conventional sludge compost from an industrial WWTP digestion process, obtaining similar values from both. Sanitised (free of Escherichia coli and Salmonella spp.) and stable compost (respirometric index at 37 °C below 0.5 mgO g organic matter·h) was obtained from both sludges.
在 35°C、70d 固体停留时间和 30d 水力停留时间的条件下，采用厌氧膜生物反应器（AnMBR）中运行了一年的微藻（绿藻属）和原污泥厌氧共消化（ACoD）中试规模工厂，该工厂在 pH 和 VFA 浓度方面表现出很高的稳定性。该工厂实现了微藻和原污泥基质的高度降解，导致甲烷产量达到 370 mLCH·gVS。得到了富营养流出物（消化液中的 685mgN·L 和 145mgP·L 以及渗透物中的 395mgNH-N·L 和 37mgPO-P·L），允许后续的养分回收。通过疏水性聚丙烯中空纤维膜接触器将渗透物中的氨转化为硫酸铵，实现了 99%的氮回收效率。然而，由于废水中只有 26%的磷可用，因此没有通过鸟粪石沉淀等工艺进行磷回收。在实验室规模的 Dewar 反应器中评估了来自 ACoD 中试工厂的消化液的堆肥过程，以及来自工业 WWTP 消化过程的常规污泥堆肥，两种堆肥都获得了相似的值。从两种污泥中均获得了消毒（无大肠杆菌和沙门氏菌属）和稳定的堆肥（37°C 下的呼吸计量指数低于 0.5mgO·g 有机物质·h）。
