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Struvite recovery: pilot-scale results and economic assessment of different scenarios

机译：鸟粪石的回收：不同情景下的中试规模结果和经济评估

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A pilot study was carried out in a waste water treatment plant (WWTP) to recover phosphorous by Struvite precipitationnfrom anaerobic digester centrate by means of Ostara’s Pearl technology with the objective to assessntechnically and economically the performance and reliability of this process treating sidestreams with differentnconcentrations of phosphorous and also to assess the quality of the fertilizer obtained. Different scenarios werenstudied: phosphorous inlet ranged from 31 to 150 mg PO4-P/L. The phosphorous removal varied from 60 to 81%ndepending on the influent, and the quality of the Struvite obtained was suitable to be used as a fertilizer. Theneconomic assessment of implementing Struvite Pearl recovery process at full scale in WWTPs with anaerobicndigestion (AD) and P-physicochemical or bio-P removal was carried out, taking into account investmentn(CAPEX) and operating costs (OPEX) of the Struvite recovery process and the economic savings due to phosphorousnand ammonium removal in centrates. The results showed that with the current reagent strategies andninvestment costs, the Struvite recovery process was not economically feasible for WWTPs with AD and P-physicochemicalnremoval. However, in the case of bio-P removal WWTPs with AD, the process can be an economicnsolution (pay back between 5 and 10 years, OPEX recovered due to the selling Struvite) which creates a highnvalue re-cycled fertilizer and saves the environment due to the higher efficiency of the fertilizer usage.
机译：在Ostara的Pearl技术中，在废水处理厂（WWTP）中进行了一项初步研究，以通过厌氧消化池中的鸟粪石沉淀中的鸟粪石沉淀回收磷，目的是从技术上和经济上评估该工艺处理不同浓度磷的支流的性能和可靠性。并评估所获得肥料的质量。研究了不同的情况：磷进口量范围为31至150 mg PO4-P / L。磷的去除率在60％至81％n之间，具体取决于进水量，并且所获得的鸟粪石的质量适合用作肥料。然后，考虑到Struvite回收过程的投资（CAPEX）和运营成本（OPEX），对在厌氧消化（AD）和P-物理化学或生物P去除的污水处理厂中全面实施Struvite Pearl回收过程进行了经济评估。由于去除了磷和铵，因此节省了经济成本。结果表明，在目前的试剂策略和投资成本的情况下，鸟粪石的回收工艺对于带有AD和P物理化学去除的污水处理厂在经济上是不可行的。但是，对于带有AD的生物磷去除废水处理厂，该过程可能是一种经济的解决方案（5到10年之间可收回投资，由于Struvite的销售使OPEX得以回收）可产生高价值的循环肥料，并节省了环境。从而提高肥料使用效率。

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