sludge conditioning Articles
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Synthesis and characterisation of new cationic polyelectrolytes by inverse emulsion polymerisation and their application in activated sludge dewatering
Water soluble hydrophobically associated polyelectrolytes were copolymerised with dimethyl- [2-(2-methyl-acryloyloxy)-ethyl]-alkyl ammonium bromide (alkyl: propyl, hexyl, dodecyl) (DEACn) and acrylamide (AM) in inverse emulsion. Cationic hydrophobically modified polyacrylamides having different molecule weight and cationic degree were obtained by varying the total monomer concentration and ...
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Let it do the job for you! VOLUTE frees operators from maintenance
Nippoh Chemicals Co., Ltd. Problem Operators had to make frequent check-ups and maintenance with the existing belt filter press before introducing the VOLUTE Dewatering Press. Sludge conditions changed time to time so that diluted sludge often spilled over from the side of the filter cloth, making operators have to clean up the machine every three hours. Solution Management recognized the ...
By Amcon Inc.
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Nippon Chemicals CO.,LTD - Case Study
Let it does job for you! VOLUTE frees operator from maintenance. Operators had to make frequent check-up and maintenance with the existing belt filter press before introducing the VOLTUE Dewatering Press. Sludge condition changed time to time that dilute sludge often spilled over from the side of filter cloth, making operators to clean up machine every three hours. AMCON's offer for a solution ...
By Amcon Inc.
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Improve bio-activity of anaerobic sludge by low energy ultrasound
This research focused on ultrasound-enhanced bio-activity of anaerobic sludge. Low energy ultrasound irradiation can increase the bio-activity of anaerobic sludge. Ultrasonic parameter, characteristics of anaerobic sludge and experimental conditions are important parameters which affect the enhancement effect on anaerobic sludge. In order to assess the effects of characteristics of anaerobic ...
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Biotreatment of Odors from the Zimpro Sludge Conditioning Process
Management of odor emissions generated during thermal sludge conditioning is a well known disadvantage of the “Zimpro” process. Traditional methods of using chemical oxidation and high temperature destruction result in the formation of secondary products, such as chlorine gas, organic halocarbons or nitrogen oxides. In this study, biotrickling filter technology was evaluated at the Villa Hills ...
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Fast start-up of expanded granular sludge bed (EGSB) reactor using stored Anammox sludge
Stored Anammox sludge (SAS) was used in an expanded granular sludge bed (EGSB) reactor treating synthetic wastewater with the aim of evaluating its possible use as seed sludge. The SAS had been kept in a refrigerator (4 °C) without any feed. After 2 years, only 1–2% Anammox bacteria could survive in the SAS. However, it soon prevailed in the EGSB reactor after loading. ...
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Rheological behaviors of anaerobic granular sludge in a spiral symmetry stream anaerobic bioreactor
The rheological behaviors of the anaerobic granular sludge (AGS) in a spiral symmetry stream anaerobic bioreactor (SSSAB) were investigated. Shear-thinning behavior, thixotropic behavior, concentration–viscosity behavior and temperature–viscosity behavior were evaluated based on the constitutive equation of the AGS. The results indicated that the Herschel–Bulkley model was ...
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Comparison of saline wastewater treatment performance of SBR with repeated starvation under aerobic and non-aerobic conditions
This study investigated the effects of repeated starvation and feeding on the performance of a sequencing batch reactor (SBR) used for treating saline wastewater. The effects of aerobic and non-aerobic conditions on the sludge during starvation were evaluated to recover the performance of the SBR in terms of floc size and pollutant removal after resuming wastewater feeding. The floc size, fractal ...
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Dynatec Provides Membrane System to Recover Silver
Dynatec was selected to provide a complete system to recover silver in Dupont's Manati, Puerto Rico microcircuit materials plant. The Problem Dupont's microcircuit materials production facility in Manati, Puerto Rico produces high purity silver in their process. The process produces a wastewater stream containing valuable dissolved silver compounds. The plant had an existing membrane ...
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UV disinfection of wastewater flocs: the effect of secondary treatment conditions
Activated sludge flocs that are carried to the final effluent can significantly decrease the effectiveness of ultraviolet (UV) disinfection of wastewater. This effect is detected in a typical UV dose–response curve, where at higher UV doses there is a decrease in the inactivation rate (tailing). In this study, the effect of activated sludge process conditions on the UV inactivation ...
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Nitrogen behavior during sludge ozonation: a long-term observation by pilot experiments
Sludge ozonation is a promising technology for dealing with the increasing challenge of excess sludge treatment and disposal. However, nitrogen behavior during sludge ozonation and subsequent biological removal remains unclear. To clarify the feasibility and stability of oxidizing organic nitrogen (released during sludge ozonation) in the bioreactor (but not during ozonation), and the best ...
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Enhanced dewaterability of sewage sludge with zero-valent iron-activated persulfate oxidation system
The potential benefits of zero-valent iron-activated persulfate (Na2S2O8) oxidation in enhanced dewaterability of sludge, along with the associated mechanisms were investigated in this study. The sludge dewaterability was evaluated in terms of specific resistance to filtration (SRF) and water content. Based on these indexes, it was observed that ZVI-S2O82 oxidation effectively improved sludge ...
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Differences in soluble COD and ammonium when applying ultrasound to primary, secondary and mixed sludge
Ultrasound treatment is often applied to enhance the anaerobic digestion of sludge. Optimal conditions for organic matter solubilisation of primary, secondary and mixed sludge were assessed by implementing ultrasound disruption at different specific energies (from 3,500 to 21,000 kJ/kgTS). The variation in soluble chemical oxygen demand (sCOD) and ammonium nitrogen (NH4+-N) was monitored ...
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Evaluation of methanogenic treatment of TMAH (tetra-methyl ammonium hydroxide) in a full-scale TFT-LCD wastewater treatment process
This study evaluated TMAH biodegradation under methanogenic conditions. Under methanogenic conditions, a sludge from a full-scale UASB treating TFT-LCD wastewater was able to degrade 2,000 mg/L of TMAH within 10 h and attained a specific degradation rate of 19.2 mgTMAH/gVSS-h. Furthermore, several chemicals including some surfactants, DMSO, and sulfate were examined for their potential inhibitory ...
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How Chemicals Are Used in Wastewater Treatment
There are many different steps to process wastewater, but one of the most important is using the chemical dosing system. This system involves a chemical feed station delivering a chemical substance into sewage, sludge, and foul water. Pumping systems like these at wastewater treatment plants usually consumes between 10% and 15% of the plant’s energy, making this process a significant part ...
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Orthophosphate removal from aqueous solutions using drinking-water treatment sludge
Drinking-water treatment sludge (DWTS) is a by-product generated during the production of drinking water where iron hydroxides are the main component of the sludge. The aim of the study presented here was to determine the effectiveness of using ferric sludge from two underground water treatment stations to remove orthophosphates from a model solution. The analyses were performed in static ...
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Characteristics of thermophilic granulation processes in UASB reactors
Thermophilic granulation processes were examined with synthetic wastewaters and were compared with the parallel mesophilic ones. The results indicated that granules could be formed well under compatible thermophilic surroundings in both carbohydrate- and protein-rich substrates. Compared with the mesophilic process, thermophilic granulation took relatively longer time, but thermophilic UASB ...
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Chitosan use in chemical conditioning for dewatering municipal-activated sludge
This work aims to evaluate the potential use of chitosan as an eco-friendly flocculant in chemical conditioning of municipal-activated sludge. Chitosan effectiveness was compared with synthetic cationic polyelectrolyte Sedipur CF802 (Sed CF802) and ferric chloride (FeCl3). In this context, raw sludge samples from Beni-Messous wastewater treatment plant (WWTP) were tested. The classic jar test ...
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Application of recycled sludge to stabilize coagulation process
In conventional treatment of variable quality mountain water, an inability to immediately adjust the coagulant dose to variations in water quality causes overdose or underdose of coagulant in relation to its optimal value. The results of the research showed that the reuse of post-coagulation sludge was an effective method to maintain high and stable coagulation effectiveness under both ...
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Case Study | Taicang Nanjiao Sewage Treatment Plant
With the development of science and technology, automation technology has been widely promoted, and more and more automation products have been applied to our life. So what will happen when automation is applied to sewage treatment plants? Accompanied by the patter of light rain, in rows of neat buildings, we arrived at Taicang Nanjiao Sewage Treatment Plant, one of the largest sewage treatment ...
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