Impact of Thermal Hydrolysis Solids Pretreatment on Sidestream Treatment Process Selection at the DC Water Blue Plains AWTP

Figdore, Bryce; Bowden, Gregory; Bodniewicz, Bohdan; Bailey, Walter; Derminassian, Rouben; Kharkar, Salil; Murthy, Sudhir

doi:10.2175/193864710798193950

Cited by 4 publications

(6 citation statements)

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“…Over the course of a comprehensive sidestream treatment alternatives evaluation (Figdore et al, 2010), DC Water came to favor sequencing batch reactors (SBRs) capable of nitritationdenitritation or deammonification for biological treatment of the dewatering sidestream. A multiple-SBR facility which affords this operational flexibility would accommodate a phased implementation of deammonification.…”

Section: Introductionmentioning

confidence: 99%

Deammonification of Dewatering Sidestream from Thermal Hydrolysis-Mesophilic Anaerobic Digestion Process

Figdore¹,

Wett²,

Hell³

et al. 2011

proc water environ fed

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In 2014, DC Water will begin operating a new solids processing train at the Blue Plains Advanced Wastewater Treatment Plant consisting of the CAMBI thermal hydrolysis process for solids pretreatment prior to mesophilic anaerobic digestion. DC Water has chosen sequencing batch reactors capable of nitritation-denitritation or deammonification (using the DEMON process) for separate biological treatment of the dewatering sidestream. As part of the sidestream treatment alternatives evaluation, studies were conducted using sidestream generated from an existing CAMBI-digestion plant to confirm the suitability of the DEMON process to treat such a sidestream and to provide insight on design loading rates and related issues. Experimental results reveal a significant reduction in nitrogen conversion rates-rather for the aerobic ammonia oxidizers than for the anammox organisms. Both biomass acclimation and decrease in refractory soluble COD concentrations could alleviate inhibitory impacts.

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Section: Introductionmentioning

confidence: 99%

Deammonification of Dewatering Sidestream from Thermal Hydrolysis-Mesophilic Anaerobic Digestion Process

Figdore¹,

Wett²,

Hell³

et al. 2011

proc water environ fed

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“…Based on the recommendations [4,13], we will consider the influence of the pH value in the bioaugmentation zone on the nitrification process. According to studies [3,6,[18][19][20][21][22], a decrease in the alkalinity of the medium is observed during the nitrification process. If the pH of the supplied water flow is too low, then a decrease in alkalinity in the future can lead to complete inhibition of the process, which is observed at pH = 5.8.…”

Section: Resultsmentioning

confidence: 99%

“…During the process, the return flows and the AS underwent an aeration process; the O 2 concentration in the reactor was kept in the range of up to 3 mg/l [13,17]. In the absence of "competition" for oxygen with microorganisms that are not able to independently produce nutrients from an inorganic environment through the use of photosynthesis or chemosynthesis, which are in a depressed state due to the lack of nutrition in organic matter-depleted drain water and a high content of nitrifying biomass, due to the total high dose of return AS, nitrifying bacteria exhibit high ammonium-oxidizing activity [14,[18][19][20][21][22].…”

Section: Methodsmentioning

confidence: 99%

Bioaugmentation in wastewater treatment: Features of technology and automation

Shilkina,

Baraboshkina

2023

E3S Web Conf.

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The growth of the population of our planet, especially in cities, brings to the fore the problem of waste disposal, both solid and liquid. In the US and Europe alone, residents annually produce about 67 billion cubic meters of wastewater requiring treatment. For each type of waste, many processes and methods for their neutralization have been developed in the world practice. For wastewater treatment, bioaugmentation is currently the most common method, it is also widely used in soil bioremediation and air biofiltration. However, it should be borne in mind that there is no single component that allows cleaning from any impurities. In each individual case, it is necessary to conduct a comprehensive analysis of environmental parameters, composition of pollutants, available technologies and other conditions. And although there is no universal mechanism for bioaugmentation, the developed processes allow you to choose an algorithm for almost every specific task. But with any chosen algorithm of operation, the implementation of an automated control system should be a mandatory part of the process. Optimization of the wastewater treatment process allows not only to protect the environment, but also often leads to the efficient use of chemicals, reducing the amount of solid waste, and reducing energy consumption. Therefore, wastewater treatment plant controls used to monitor and control wastewater treatment plants are becoming absolutely essential in today’s world.

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“…This stream can also be referred to either as recycled centrate, THP return liquor or anaerobic digestion dewatering sidestream. It is usually rich in nutrients (nitrogen and phosphorus), which could be of potential interest for recovery and use as fertilizers [91,92]. As it cannot be discharged into the natural environment, it is rather returned to the WWTP headworks.…”

Section: Filtrate Qualitymentioning

confidence: 99%

Thermal Hydrolysis of Municipal sludge: Finding the Temperature Sweet Spot: A Review

Devos

Haddad

Carrère

2020

Waste Biomass Valor

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The increasing demand for a Thermal Hydrolysis Process (THP) to pretreat municipal sludge upstream Anaerobic Digestion (AD) opens the opportunity to further develop and optimise this technology. The optimal THP temperature remains unclear due to the production of refractory compounds at high temperature. A compilation of literature data was conducted to investigate the existence of a temperature sweet spot for the THP applied to municipal sludge. All related reports (n=43) were included. The THP temperature range impact was assessed in the range of 100°C -200°C on 4 AD and dewatering performance indicators (CH4 production, Volatile Solid Reduction (VSR), Dewaterability (DW) and filtrate quality). Other parameters potentially affecting the performance indicators were also considered. These parameters include the type of sewage sludge and operational conditions related to THP and AD. The impact of all parameters on performance indicators was evaluated with a Kruskal-Wallis statistical test. For THP temperature optimisation, a pairwise comparison, using a Wilcoxon test, was made. A temperature optimum in the [140-160]°C range was proposed. It seemed to minimize the production of refractory compounds, while maximising AD and dewatering performances. It is noteworthy that above 160°C, the concentration in refractory compounds and soluble COD increases sharply, thus leading to a potential deterioration of WWTP effluent quality.

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Impact of Thermal Hydrolysis Solids Pretreatment on Sidestream Treatment Process Selection at the DC Water Blue Plains AWTP

Cited by 4 publications

References 0 publications

Deammonification of Dewatering Sidestream from Thermal Hydrolysis-Mesophilic Anaerobic Digestion Process

Deammonification of Dewatering Sidestream from Thermal Hydrolysis-Mesophilic Anaerobic Digestion Process

Bioaugmentation in wastewater treatment: Features of technology and automation

Thermal Hydrolysis of Municipal sludge: Finding the Temperature Sweet Spot: A Review

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