Dairy Manure Wastewater Remediation Using Non-airtight Digestion Pretreatment Followed by Microalgae Cultivation
- PDF / 519,266 Bytes
- 13 Pages / 439.37 x 666.142 pts Page_size
- 12 Downloads / 179 Views
Dairy Manure Wastewater Remediation Using Non-airtight Digestion Pretreatment Followed by Microalgae Cultivation Liang Wang 1 & Lide Chen 1
2
& Wu Sarah & Muhammad Aamir Bashir
2
Received: 9 April 2020 / Accepted: 22 June 2020/ # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
The non-airtight digestion technology is emerging to be applied in the acidogenic phase for two-stage methane production. However, in this study, it was used to pretreat screened dairy manure (SDM) in order to provide microalgae cultivation with a substrate that might be more suitable for nutrient reduction, especially phosphorus. SDM was firstly underwent non-airtight digestion applying different dilution folds, i.e., blank (no dilution), 5-fold, 10-fold, and 15-fold. Total solids (TS), total dissolved solids (TDS), and chemical oxygen demand (COD) of the SDM were mostly reduced when there was no dilution applied. Five-fold dilution is the most beneficial one for ammonia reduction. Total phosphorus (TP) was reduced the most efficiently in the blank SDM. After the non-airtight digestion, 5-fold diluted original SDM, 5-fold diluted digested original SDM, and digested 5-fold diluted SDM were used to grow microalgae for 8 days. Microalgae grown in 5-fold diluted digested original SDM and digested 5-fold diluted SDM had better removal efficiencies in COD and NH4-N. From the monitoring of pH and TP during the 8-day culture period, it is found that pHs were peaked on the 4th day for microalgae grown in 5-fold diluted digested original SDM and digested 5fold diluted SDM, corresponding to the maximal TP removal. Non-airtight digestion of SDM could help achieve better nutrient removal by microalgal cultivation in a shorter time span. Keywords Screened dairy manure . Non-airtight digestion . Microalgal cultivation . Ammonia and phosphorus removal
* Lide Chen [email protected]
1
Department of Soil and Water Systems, Twin Falls Research & Extension Center, University of Idaho, 315 Falls Ave, Twin Falls, ID 83301, USA
2
Department of Biological Engineering, University of Idaho, 875 Perimeter Drive, Moscow, ID 83844, USA
Applied Biochemistry and Biotechnology
Introduction Dairy manure poses a grand challenge to the local ecological environment in southern Idaho, since this region has a large concentration of dairy producers. Anaerobic digestion (AD) is a common method to reduce the organic content of manure while produce biogas for heating or electricity simultaneously [1]. However, due to the relatively high complexity related to system maintenance for process stability, very few local dairies applied AD onsite. Recently, a new strategy using a non-airtight system for the hydrolysis and acidification of mixed agricultural wastes, mainly composed of animal manure and lignocellulosic biomass, has emerged for better hydrolysis efficiency, faster volatile solids reduction, and more organic acids produced for later methane fermentation [2, 3]. Compared with AD, non-airtight digestion of dairy manure may embrace special
Data Loading...
