Ammonia removal from thermal hydrolysis dewatering liquors via three different deammonification technologies

The benefits of deammonification to remove nitrogen from sidestreams, i.e., sludge dewatering liquors, in municipal wastewater treatment plants are well accepted. The ammonia removal from dewatering liquors originated from thermal hydrolysis/anaerobic digestion (THP/AD) are deemed challenging. Many different commercial technologies have been...

Cascade anaerobic digestion system treating waste activated sludge under short sludge retention time: process performance and role of recirculation

Hydrolysis, where the complex insoluble organic matter is hydrolyzed by hydrolytic enzymes, is regarded as rate-limiting step for anaerobic digestion of waste activated sludge (WAS). The cascade system, which consisted of small-reactors in series, was developed in this study to enhance the hydrolysis rate. Degradation efficiency of sludge was...

Evaluation of compounds generated in the thermal hydrolysis process on microbial activities in partial nitritation/anammox process

Anaerobic digestion (AD) is a traditional technique to treat sewage sludge and produce biogas. Thermal hydrolysis process (THP) is a feasible pretreatment for AD by improving the biodegrdability of organic compounds. Partial nitritation/anammox (PN/A) process could be applied in side-stream for treating the reject water from AD since the reject...

Evaluation of feasibility of using the bacteriophage T4 lysozyme to improve the hydrolysis and biochemical methane potential of secondary sludge

Anaerobic digestion (AD) of secondary sludge is a rate-limiting step due to the bacterial cell wall. In this study, experiments were performed to characterize secondary sludges from three wastewater treatment plants (WWTPs), and to investigate the feasibility of using bacteriophage lysozymes to speed up AD by accelerating the degradation of...

Experimental studies of furfural production from water hyacinth (Eichhornia Crassipes)

Furfural is a very promising product of lignocellulosic biomass-based biorefineries and has the potential to become a useful resource for further conversion and utilization. Aquatic plants show an enormous potential as feedstock since they do not compete for land use, and they require minimal water consumption in a biorefinery concept due to...

Insights into the regulatory function of the 1 subunit from bacterial F-type ATP synthases: A comparison of structural, biochemical and biophysical data

ATP synthases catalyse the formation of ATP, the most common chemical energy storage unit found in living cells. These enzymes are driven by an electrochemical ion gradient, which allows the catalytic evolution of ATP by a binding change mechanism. Most ATP synthases are capable of catalysing ATP hydrolysis to varying degrees, and to prevent...

Effect of humic acid on anaerobic digestion of cellulose and xylan in completely stirred tank reactors: inhibitory effect, mitigation of the inhibition and the dynamics of the microbial communities.

Inhibition effect of humic acid (HA) on anaerobic digestion of cellulose and xylan and the mitigation potential of the inhibition were evaluated in controlled fed batch reactors at 30 °C and a hydraulic retention time (HRT) of 20 days. Reactor performances were evaluated by biogas production and metabolite measurements for 220 days. Microbial...

Mitigation of Humic Acid Inhibition in Anaerobic Digestion of Cellulose by Addition of Various Salts

Humic compounds are inhibitory to the anaerobic hydrolysis of cellulosic biomass. In this study, the impact of salt addition to mitigate the inhibitory effects of humic compounds was investigated. The experiment was conducted using batch tests to monitor the anaerobic hydrolysis of cellulose in the presence of humic acid. Sodium, potassium,...

Enhanced digestion and alginate-like-exopolysaccharides extraction from Nereda sludge

Aerobic granular sludge/Nereda technology has proven to be more beneficial compared to activated sludge systems. Until now not much research has been spend on treatment of Nereda excess sludge (NES). In this study the biodegradability of NES is investigated, combined with thermal pressure hydrolysis (TPH) as pre-treatment method and the...

Production of dimethyl carbonate and monoethylene glycol

Copper Recovery Originating from Galvanic Industry

Document(en) uit de collectie Chemische Procestechnologie

Metabolism of Tetrathionate in Thiobacillus-Acidophilus