Pretreatment of brewery effluent to cultivate Spirulina sp. for nutrients removal and biomass production

Abstract

Due to the low concentration of nitrate and high contents of organics, brewery effluent was not suitable for the cultivation of Spirulina sp. This work changed the nutrient profile of brewery effluent effectively by dilution, addition of nitrate, and anaerobic digestion. The result showed that the optimum dilution rate and NaNO addition for brewery effluent were 20% and 0.5 g/L, respectively. Spirulina sp. grown in pretreated brewery effluent produced 1.562 mg/L biomass and reduced concentrations of nutrients to reach the permissible dischargeable limits. In addition, Spirulina sp. grown in pretreated brewery effluent had much higher protein content and oil content. So the appropriate treatment converted brewery effluent into a nutrient balanced medium for algae cultivation and alleviated the potential environmental problems. Pretreatment procedure developed in this work is an effective way to realize the sustainable utilization of brewery effluent and produce algal biomass with valuable nutrients.

Toxicity alleviation for microalgae cultivation by cationic starch addition and ammonia stripping and study on the cost assessment

“…At the end of cultivation, concentrations of residual NH 3 -N, TN, TP, and COD were 23.7, 91.2, 2.4, and 217.9 mg L À1 , meeting the requirement of wastewater discharge standard. 45 This result demonstrated that the pretreatment of AD-SM not only generated economic benets by producing more biomass, but also generated environmental benets by promoting nutrients recycling. (Table 2) 3.4.2 Composition of algal biomass.…”

Contribution of glycerol addition and algal–bacterial cooperation to nutrients recovery: a study on the mechanisms of microalgae‐based wastewater remediation

“…Specific problems caused by the earlier‐mentioned two issues include: (i) carbon deficiency limits the microalgae growth and slowdowns the uptake rates of other nutrients; (ii) suspended solids may not be degraded and assimilated efficiently by microalgae cells, resulting in low removal efficiency of nutrients. Similar problems were observed in the treatment of other sources of wastewater, such as food processing effluent, agricultural wastewater, and raw municipal wastewater, by microalgae culture …”

“…Fast urbanization and industrialization produce a large amount of sludge worldwide, particularly in developing countries . One such country is China, where the amount of sludge production reached 1.3 million tons (dry weight) by 2008 and is increasing at an annual rate of 10% .…”

“…Microalgae, a category of unicellular phytoplankton with great performance in nutrients recovery, have been widely used in wastewater remediation . At the same time, nutrients in wastewater are converted to biomass which can be further processed to produce value‐added products, such as biofuel and bio‐fertilizer . According to the experimental results, Chlorella sp.…”

Application of a novel microalgae‐film based air purifier to improve air quality through oxygen production and fine particulates removal

“…19 Considering the harmful effects of alkaline environment on microalgal metabolism, pH value of microalgae film should be controlled around 6.5. 20 Comparison of Fig. 3(c) and (d) showed that in the purification process (20 min), no significant difference was observed in fine particulates removal between rehydrated vacuum-dried microalgae and living microalgae.…”