Algal-Bacterial Symbiosis System Treating High-Load Printing and Dyeing Wastewater in Continuous-Flow Reactors under Natural Light

Abstract

This study investigated the symbiotic structure relationship between mixed algae andactivated sludge while treating high-load printing and dyeing wastewater under natural light. Theeffects of hydraulic retention time (HRT) (12 h, 16 h and 20 h) and aeration rate (0.1–0.15, 0.4–0.5and 0.7–0.8 L/min) on algal–bacterial symbiosis (ABS) and conventional activated sludge (CAS)systems. Experimental results showed that the ABS system exhibited the best removal performancefor chemical oxygen demand (COD), ammonia nitrogen (NH4+-N) and total phosphorus (TP),which was increased by 12.5%, 23.1% and 10.5%, respectively, and reduced colour 80 timescompared with the printing and dyeing wastewater treatment plant. Algae growth could bepromoted under lower dissolved oxygen (DO), and the addition of algae could provide more DO tothe ABS system. The particle size distribution of sludge in the ABS system was stable, whichguaranteed a stable treatment effect. In addition, the COD and colour could be further degradedunder the conditions of no external carbon source and longer HRT. It is expected that the presentstudy will provide a foundation for the practical application of the ABS system, and new insightsfor the treatment of printing and dyeing wastewater.

Analysing the influence of operating conditions on the performance of algal–bacterial granular sludge processes for wastewater treatment: A review

“…Several studies have researched the symbiotic relationship between microalgae and activated sludge during the treatment of high‐load printing and dyeing textile wastewater under natural light. The results showed that the ABGS system exhibited a better removal of COD, ammonia N and TP, which were 12.5%, 23.1% and 10.5%, respectively, reducing the colour up to 80 times in comparison with AGS processes (Lin et al, 2019). In addition, COD and colour may be degraded further under conditions of no external carbon source and prolonged HRTs (Işik & Sponza, 2008).…”

Phycoremediation of Synthetic Dyes Laden Textile Wastewater and Recovery of Bio-Based Pigments from Residual Biomass: An Approach towards Sustainable Wastewater Management

“…[74,75]. Along with the treatment, it has also been observed that the treated effluent tends to have higher dissolved oxygen content while releasing into back into the environment [76]. All these factors give the edge to phycoremediation-based treatment technologies over other treatment methods for handling textile wastewater.…”

“…In one of the recent studies conducted by [124] on the algal bacterial consortium for CI RB 40 reactive azo dye degradation, they demonstrated that the consortium of Pseudomonas putida, Chlorella and Lactobacillus plantarum under the optimized conditions was able to decolorize CI RB 40 dye up to 99% along with COD removal of 89% at 1000 ppm of dye concentration. In another study, [76] compared the conventional activated In one of the recent studies conducted by [124] on the algal bacterial consortium for CI RB 40 reactive azo dye degradation, they demonstrated that the consortium of Pseudomonas putida, Chlorella and Lactobacillus plantarum under the optimized conditions was able to decolorize CI RB 40 dye up to 99% along with COD removal of 89% at 1000 ppm of dye concentration. In another study, Ref.…”

“…In another study, Ref. [76] compared the conventional activated sludge system (CAS) and algal bacterial symbiosis (ABS) for treating printing and dyeing wastewater under natural light conditions. This study determined that ABS was more efficient than CAS and demonstrated 80% more color removal through ABS with a hydraulic retention time (HRT) of 16 h. Ref.…”

Opportunities for Microalgae-Bacteria Consortium Application to the Treatment of Effluents Generated in Fiber-Waste-Based Recycling Processes

“…These photobioreactors are characterized by aerobic decomposition commonly known as fermentation and respiration, biosynthesis and endogenous respiration; and their main feature is the conversion of organic compounds into biomass and CO2 [11]. The operation of photobioreactors can occur in two ways: in sequential batches [12]- [14] and in continuous flow [15]- [17], with anaerobic and anoxic zones [18]. [20] applied variations of aeration and lighting in the PBSB and thus found granules with a great abundance of microalgae from the seventh day of operation and particle size larger than 2.5 mm.…”