Biodegradation Of Textile Wastewater Research Articles

Novel Quantitative Evaluation of Biotreatment Suitability of Wastewater

The development of wastewater treatment industry has gradually entered the high-standard period and the wastewater treatment technology needs to be refined for different types of wastewater. Traditional water quality indicators are not able to explain new problems encountered in the current wastewater treatment process, especially the potential of removing pollutants via biological methods. This research proposed a new method of evaluating the biological treatment process by measuring the oxygen consumption in the biodegradation of pollutants on-the-go and describing the complete biological oxygen consumption process. The biodegradability of wastewater from an actual textile wastewater treatment plant was quantitatively evaluated by analyzing the proportion of different organic pollutions. Results showed that the hydrolytic acidification can improve the biodegradability of textile wastewater by increasing the content of biodegradable organic matter (growth of 86.4%), and air flotation has little effect on the biodegradability of the wastewater. Moreover, the biodegradability of the textile wastewater could be improved by increasing the nitrogen and phosphorus content, which could come from urea and K2HPO4. Concretely, nitrogen source mainly increases organic matter of rapid bio-treated and organic matter of easy bio-treated by 14.94% and 70.79%, and phosphorus source mainly increases the organic matter of easy bio-treated by 143.75%. We found that the optimum concentration of additional N and P to the textile wastewater was 35 mg/L and 45 mg/L, respectively. This approach holds great application prospects such as risk control, optimizing treatment technology, and management, due to its characteristics of being simple, easy to use, and rapid online implement action.

Enhanced Decolourisation and Biodegradation of Textile Wastewater Using Single and Mixed Cultures of a Newly Isolated Enterobacter Strain.

The novel Enterobacter strains TS1L and TS3, isolated from textile wastewater, showed a good ability to decolourise Basic Red 9 (BR9). The effects of various physicochemical parameters on decolourisation efficiency were evaluated using both single and mixed culture of Enterobacter sp. The optimal conditions for the decolourising activity of strains TS1L, TS3 and a mixed culture were as follows: textile wastewater as sole substrate without glucose addition, pH 7.0, 150rpm, 35°C and 12h of incubation. The highest decolourisation rate was observed at 81.15% for the single culture of strain TS1L. Moreover, TS1L not only reduced BR9 in wastewater, but also improved the quality of the water under optimal conditions. The treated wastewater met the criteria of the Water Quality Standard (Thailand). Based on gas chromatography-mass spectrometry, TS1L completely degraded BR9 and converted it into organic compounds. To our knowledge, this is the first report of Enterobacter with the ability to decolourise BR9 dye.

Biodegradation of Textile Wastewater by Naturally Attenuated Enterobacter sp.

Biodegradation of Textile Wastewater by Naturally Attenuated Enterobacter sp.

Biodegradation of textile wastewater: enhancement of biodegradability via the addition of co-substrates followed by phytotoxicity analysis of the effluent.

This work reports on the biodegradation of textile wastewater by three alternative microbial treatments. A bacterial consortium, isolated from a dyeing factory, showed significant efficacy in decolourizing wastewater (77.6 ± 3.0%); the decolourization rate was 5.80 ± 0.31 mg of azo dye·L-1·h-1, without the addition of an ancillary carbon source (W). The degradation was 52% (measured as COD removal) and the products of the treatment showed low biodegradability (COD/BOD5 = 4.2). When glucose was added to the wastewater, (W + G): the decolourization efficiency increased to 87.24 ± 2.5% and the decolourization rate significantly improved (25.67 ± 3.62 mg·L-1·h-1), although the COD removal efficiency was only 44%. Finally, the addition of starch (W + S) showed both a similar decolourization rate and efficiency to the W treatment, but a higher COD removal efficiency (72%). In addition, the biodegradability of the treated wastewater was considerably improved (COD/BOD5 = 1.2) when starch was present. The toxicity of the degradation products was tested on Lactuca sativa seeds. In all treatments, toxicity was reduced with respect to the untreated wastewater. The W + S treatment gave the best performance.

Degradation of Textile Wastewater Using Solar Photocatalysis and SBR

In this study, a new kind of photocatalysts was prepared by titanium dioxide, sodium dodecyl sulfate and copper. It was used to improve the biodegradability of textile wastewater under solar light. The effect of light intensity, dissolved oxygen and wastewater hydraulic remain time on the biodegradability improvement were researched. Experiments show that when the light intensity, DO and HRT are 2.1mW/cm2, 2.37mg/L and 3h, respectively, the B/C value of textile wastewater increases from 0.11 to 0.37, and DHA value increases from 3.72TF/(ml·h) to 22.68μgTF/(ml·h). Photocatalysis reactor combined with sequencing batch reactor was used to further treat textile wastewater. The results show that COD and BOD5 decline to 71mg/L and 18mg/L, respectively.

Modeling the performance of biodegradation of textile wastewater using polyurethane foam sponge cube as a supporting medium

A pilot-scale fixed-biofilm reactor (FBR) was established to treat textile wastewater to evaluate the feasibility of replacing conventional treatment processes that involve activated sludge and coagulation units. A kinetic model was developed to describe the biodegradation of textile wastewater by FBR. Batch kinetic tests were performed to evaluate the biokinetic parameters that are used in the model. FBR column test was fed with a mean COD of 692 mg/L of textile wastewater from flow equalization unit. The influent flow rate was maintained at 48.4 L/h for FBR column test. Experimental data and model-predicted data for substrate effluent concentration (as COD), concentration of suspended biomass in effluent and the amount of carbon dioxide (CO(2)) produced in the effluent agree closely with each other. Microscopic observations demonstrated that the biofilm exhibited a uniform distribution on the surface of polyurethane foam sponge. Under a steady-state condition, the effluent COD from FBR was about 14.7 mg COD/L (0.0213 S(b0)), meeting the discharge standard (COD < 100 mg/L) that has been set by the government of Taiwan for textile wastewater effluent. The amount of biofilm and suspended biomass reached a maximal value in the steady state when the substrate flux reached a constant value and remained maximal. Approximately 33% of the substrate concentration (as COD) was converted to CO(2) during biodegradation in the FBR test. The experimental and modeling schemes proposed in this study could be employed to design a full-scale FBR to treat textile wastewater.