Removal of nutrients from undiluted anaerobically treated piggery wastewater by improved microalgae.

This study showed the new potential of using soluble contents and heavy metals in swine wastewater as nutrient supplements for the algae Chlorella Pyrenoidosa with biofilm attached method Algae with biofilm attached cultivation grew well in unpasteurized wastewater reaching a biomass productivity of 503 gm-2d-1, lipid content of 359% and lipid productivity of 180 gm-2d-1 Chlorella grew in BG11 medium delivered lower values for each of the aforementioned parameters The FAMEs compositions in the algae paste were mainly consisted of C16:0, C18:2, and C18:3 Algae removed NH4+-N, Total Phosphorus (TP) and COD by 759%, 684%, and 748%, respectively Notably, Zn2+, Cu+, and Fe2+ were removed from wastewater with a ratio of 6571%, 5364%, and 5889%, respectively Biofilm attached cultivation of Chlorella Pyrenoidosa in swine wastewater containing heavy metals could accumulate considerable biomass and lipid, and the removal ratio of NH4+-N, TP, COD and, as well as heavy metal were high Treatment of wastewater with biofilm attached cultivation showed an increasingly popular for the concentration of microalgae and environmental sustainability

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Biofilm Attached Cultivation of Chlorella pyrenoidosa Is a Developed System for Swine Wastewater Treatment and Lipid Production

Screening of the dominant Chlorella pyrenoidosa for biofilm attached culture and feed production while treating swine wastewater

Chemical Oxygen Demand (COD) is an important parameter for the detection of organic pollutants in water. UV absorption detection method of COD is a simple physical method that can detect water samples online without secondary contamination from chemical reagent. In this paper, the detection of COD based on UV absorption method was studied. The UV absorption method was used to detect COD in water samples, and the COD online detection device was designed. Optical path and circuit design principle of the device were introduced to overcome the difficulties including weak signal and the output signal instability, and the size of the system was effectively reduced. Contrast experiments showed that the system performance and measurement results are reliable and can be used for accurate COD detection within its range (up to 1000 mg/L).

Study and design on chemical oxygen demand measurement based on ultraviolet absorption

Improvement of phosphate solubilizing bacteria Paenibacillus xylanexedens on the growth of Chlorella pyrenoidosa and wastewater treatment in attached cultivation.

A novel rapid methodology for determining the chemical oxygen demand (COD) based on a thermal sensor with a flow injection analysis system was proposed and experimentally validated. The ability of this sensor to detect and monitor COD was based on the degree of enthalpy increase when sodium hypochlorite reacted with the organic content in water samples. The measurement results were correlated with COD and were compared against the conventional method using potassium dichromate. The assay required only 5-7 min rather than the 2 h required for evaluation by potassium dichromate. The linear range was 5-1000 mg/L COD, and the limit of detection was very low, 0.74 mg/L COD. Moreover, this method exhibited high tolerance to chloride ions; 0.015 mol/L chloride ions had no influence on the response. Finally, the sensor was used to detect the COD of different water samples; the results were verified by the standard dichromate method.

https://www.mdpi.com/1424-8220/15/8/20501/pdf

Na Yao

Papers

A Novel Thermal Sensor for the Sensitive Measurement of Chemical Oxygen Demand.