Biosolids Minimization Using Integrated Alkaline Sludge Hydrolysis and Biological Nutrient Removal Process

Lugowski, Andrew; Nakhla, George; Patel, Jignesh; Shular, K.; Singh, Ajay

doi:10.2175/193864707788116185

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…Increasing alkalinity has been described as being an effective agent for making bacterial cell walls more susceptible to rupturing (Stephenson and Dhaliwal, 2000). Lugowski et al (2007) demonstrated that alkalinity can solubilize sludge in an experiment pre-exposing WAS to pH 12 using sodium hydroxide (NaOH). Based on data (not shown), it was found that the mechanical shearing pretreatment necessary to achieve maximum chemical oxygen demand (COD) release required exposing the WAS to pH 12 for 30 minutes.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Mechanical Pretreatment Methods for the Enhancement of Anaerobic Digestion of Pulp and Paper Waste Activated Sludge

Elliott¹,

Mahmood²

2012

Water Environment Research

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BSTRACT: The conventional anaerobic digestion process, requiring long solids retention times (SRTs) to digest solids, is currently viewed as impractical for the pulp and paper industry because of high capital costs associated with the construction of new digesters. Recent developments in sludge solubilization technology could be promising in reducing digester size, which also allows for the potential use of decommissioned tanks, both of which can reduce the capital cost. Three pretreatment technologies for use with anaerobic digestion were tested on laboratoryscaie to investigate their feasibility. The SRTs in all three digesters systematically decreased from 20 to 3 days. The reference digester was fed waste activated sludge (WAS) to serve as the control at the same SRTs. The other digesters were fed WAS that had been preconditioned using mechanical shearing, sonication, or high-pressure homogenization technology. Anaerobic digestion with high-pressure homogenization produced as much methane at 3-day mean SRT as that from the reference digester operated at 20-day SRT. Therefore, a new digester can theoretically be 85% smaller than a conventional digester. An added benefit of WAS to methane conversion is the recovery of nutrients nitrogen and phosphorus. Water Environ. Res., 84, 497 (2012).

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Section: Methodsmentioning

confidence: 99%

Comparison of Mechanical Pretreatment Methods for the Enhancement of Anaerobic Digestion of Pulp and Paper Waste Activated Sludge

Elliott¹,

Mahmood²

2012

Water Environment Research

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Full-scale application of focused-pulsed pre-treatment for improving biosolids digestion and conversion to methane

Rittmann

Lee

Zhang

et al. 2008

Water Science and Technology

101

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We tested at full-scale the innovative Focused Pulsed (FP) technology for pre-treating waste sludge in order to improve methane gas production and biosolids reduction in sludge digestion, but without incurring problems of odors, toxicity, and high costs for chemical or energy consumption. FP pre-treatment of a mixture of primary and secondary sludge increased the soluble COD by 160% and DOC 120% over the control. FP pre-treatment of 63% of the input waste sludge increased biogas production by over 40% and reduced biosolids requiring disposal by 30% when compared to the plant baseline. FP pre-treatment also correlated with a shift of the bacterial and archaeal communities. The most significant change was that the acetate-cleaving Methanosaeta became the dominant methanogen. Full FP pre-treatment should increase biogas production and biosolids removal by 60% and 40%, respectively. Full FP pre-treatment should generate energy benefits of at least 2.7 times and as high as 18 times the FP energy input, depending on heat recovery from FP treatment. For a plant treating 76,000 m3/d of wastewater (380 m3-sludge/d), FP treatment should generate an annual economic benefit of approximately $540,000 net of electricity and other operating and maintenance costs. This represents a payback period of three years or less.

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Determining the Sustainability of Land-Applying Biosolids to Agricultural Lands Using Environmentally-Relevant Terrestrial Biota

Puddephatt¹

2021

Preprint

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Biosolids, the treated solid by-product of a WWPT, have been land-applied for decades as a means of disposal of an inexpensive form of fertilizer. However, research has shown that many chemicals such as pharmaceuticals, herbicides, pesticides, plasticizers, detergents, or heavy metals pass through the WWTP, often unaltered, and potentially end up in the biosolids. Therefore, a need to determine if the land-application of biosolids has an impact on terrestrial biota exists. In this work, six different organisms were used including Folsomia candida, Lumbricus terrestris, Zea mays, Glycine max, Phaseolus vulgaris, and Brassca rap. It was determined that government protocols were inadequate since they either prescribed organisms not environmentally-relevant or only looked at initial growth stages such as germination and emergence and not at effect, if any, on subsequent generations. Thus, new protocols were developed. Additionally, it was concluded that very little impact was seen on any of the terrestrial biota examined.

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Biosolids Minimization Using Integrated Alkaline Sludge Hydrolysis and Biological Nutrient Removal Process

Cited by 3 publications

References 8 publications

Comparison of Mechanical Pretreatment Methods for the Enhancement of Anaerobic Digestion of Pulp and Paper Waste Activated Sludge

Comparison of Mechanical Pretreatment Methods for the Enhancement of Anaerobic Digestion of Pulp and Paper Waste Activated Sludge

Full-scale application of focused-pulsed pre-treatment for improving biosolids digestion and conversion to methane

Determining the Sustainability of Land-Applying Biosolids to Agricultural Lands Using Environmentally-Relevant Terrestrial Biota

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