Swine wastewater treatment by combined process of iron carbon microelectrolysis-physical adsorption-microalgae cultivation

Abstract

Combined treatments were designed based on iron-carbon micro-electrolysis treatment (ICME), physical adsorption (PA) with zeolite (Z) or vermiculite (V) and microalgae cultivation (MC, C. vulgaris) for removing pollutants from swine wastewater (SW), herein are ICME + MC (IM), ICME + Z + MC (IZM) and ICME + V + MC (IVM). Results showed that the minimum total nitrogen (TN) of 43.66 mg L−1, NH4+-N of 1.33 mg−1 and total phosphorus (TP) of 0.14 mg−1 were obtained by IVM, while the minimum chemical oxygen demand (COD) was 105 mg−1 via IM. During the process of combined treatments, ICME contributed most to the removal of TN (84.52% by IZM), TP (97.78% by IVM and IZM) and COD (62.44% by IVM), and maximum NH4+-N removal (55.64%) was obtained by MC procedure in IM process. Vermiculite performed better than zeolite during all the combined treatments. Besides, the maximum cell dry weight (CDW, 0.74 g−1) of C. vulgaris was obtained by IM on day 13. The results provide an efficient integrated method for swine wastewater treatment.

Ultratrace Aromatic Anhydride Dopant as Intermediate Island to Promote Charge Transfer of Graphitic Carbon Nitride for Enhancing the Photocatalytic Degradation of Rhodamine B

“…Especially, dyestuff wastewater is difficult to decompose naturally and exists for a long term in the ecological cycle, which causes skin or respiratory diseases and damages human health. 1−3 In order to remedy the worsening water environment, many treatments, including physical adsorption, 4,5 microbiological degradation, 6−8 electrocatalytic degradation, 9−11 and photocatalyst degradation, 12 were used to treat dyestuff wastewater. Among them, the photocatalysis technology is gaining significant attention as a clean and energy-saving method.…”

“…In recent years, the environmental hazards caused by textile and dyeing industry wastewater have been increasing, which is mainly reflected in the fact that the wastewater produced not only destroys the natural environment but also flows into residential areas. Especially, dyestuff wastewater is difficult to decompose naturally and exists for a long term in the ecological cycle, which causes skin or respiratory diseases and damages human health. − In order to remedy the worsening water environment, many treatments, including physical adsorption, , microbiological degradation, − electrocatalytic degradation, − and photocatalyst degradation, were used to treat dyestuff wastewater. Among them, the photocatalysis technology is gaining significant attention as a clean and energy-saving method. , The key limitation to the large-scale application of the photocatalysis technology is the lack of inexpensive, safe, and high-efficiency photocatalysts.…”

Response surface methodology for process optimization in livestock wastewater treatment: A review

“…Moreover, further exploration into nutrient recovery potential from treated wastewater, comparison with conventional methods, sensitivity analyses, and strategies for knowledge transfer and adoption are crucial for advancing the application of RSM in LWW treatment [ 24 , [55] , [56] , [57] , [58] ]. In addition, biological and physicochemical processes are often combined to treat highly polluted livestock waste streams [ 7 , 51 , [59] , [60] , [61] , [62] ]. However, optimization of such combined treatment technologies using RSM has rarely been studied.…”