Impact of primary treatment methods on sludge characteristics and digestibility, and wastewater treatment plant-wide economics

Iron Recycle-Driven Organic Capture and Sidestream Anaerobic Membrane Bioreactor for Revolutionizing Bioenergy Generation in Municipal Wastewater Treatment

“…Additionally, 93.8 ± 0.5% of iron and 97.4 ± 0.1% of phosphorus flowed sidestream because of the precipitation of Fe 3+ and the adsorption of phosphorus by the precipitate. Notably, the concentration of NH 4 + –N remained almost unaffected by CEPT, while 20.2 ± 5.8% of the total nitrogen flowed sidestream, which was consistent with previously reported results . The CEPT effluent, containing 29.1 ± 2.7 mg/L NH 4 + –N with a C/N ratio of 3–4, was deemed suitable for treatment using the low-carbon partial nitritation/anammox (PN/A) process .…”

“…Notably, the concentration of NH 4 + −N remained almost unaffected by CEPT, while 20.2 ± 5.8% of the total nitrogen flowed sidestream, which was consistent with previously reported results. 8 The CEPT effluent, containing 29.1 ± 2.7 mg/L NH 4 + −N with a C/N ratio of 3−4, was deemed suitable for treatment using the low-carbon partial nitritation/anammox (PN/A) process. 29 As we know, PN/A application in WWTP is feasible when treating wastewater with high nitrogen concentrations but challenging for low nitrogen concentration wastewater because of the difficulty in suppressing nitriteoxidizing bacteria.…”

“…All sectors are actively pursuing decarbonization goals to address climate change; among such goals, there is an urgent emphasis on developing wastewater treatment systems that achieve carbon neutrality. , Municipal wastewater treatment plants (WWTPs) are energy-intensive; they consume approximately 3% of the total electricity in most countries . Therefore, it is necessary to amalgamate simple, principle-based, and advanced technologies with conventional processes to enhance the energy self-sufficiency of municipal WWTPs. − Sidestream anaerobic digestion (AD) of sludge with methane production is the most commercialized approach for bioenergy recovery in WWTPs, which can be coupled with a combined heat and power (CHP) process to offset their partial energy consumption. − The energy recovery potential from this traditional pathway can be effectively maximized by using two strategies: redirecting organic matter from mainstream oxidation to sidestream methane production and upgrading the treatment efficiency of the AD reactors.…”

Derivation of Optimal Operation Factors of Anaerobic Digesters through Artificial Neural Network Technology

“…Gas is a renewable gaseous fuel derived from biomass that can be used as an alternative to traditional fossil fuels. For that reason, energy harvesting from waste sludge through anaerobic digestion could help in energy recovery and hence improving sludge anaerobic digestion efficiency, and gas production is an important issue in current WWTP research and practice [7,8]. All in all, through the anaerobic digestion of sludge, the amount of waste disposed and the negative impact of landfills on the environment are reduced, and the gas generated during the digestion process is used as energy, reducing greenhouse gas emissions and improving the environment and soil quality [9].…”