The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Mikel Duke - One of the best experts on this subject based on the ideXlab platform.
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sustainable waste water deammonification by vacuum membrane distillation without Ph Adjustment role of water chemistry
Chemical Engineering Journal, 2017Co-Authors: Xing Yang, Hongjiao Pang, Jianhua Zhang, Audra Liubinas, Mikel DukeAbstract:Abstract Traditional aerobic processes used for deammonification in waste water treatment plants consume the majority of electrical energy. Ammonia can instead be recovered by membrane distillation but research to date proposes chemically intensive Ph Adjustment to release free ammonia from bulk solutions. Here we propose the novel application of membrane distillation to deammonify waste water without any Ph Adjustment. To demonstrate the concept, it was first shown that simple synthetic ammonia solutions strictly follow the classic ammonia-ammonium relationship with Ph which shows little release as free ammonia until at least Ph 9. However vacuum membrane distillation removed essentially all ammonium in solution as low as Ph 6.1 due to carbonate that is often found in waste waters. Via a novel ‘Ph polarisation and buffering’ mechanism, the functional effect was established due to CO2 released from the liquid-vapour membrane boundary layer causing a Ph rise that released ammonia to the permeate. Via this mechanism, high depletions, up to 99.6%, occurred consistently on solutions containing carbonate and volatile acids at low Ph, including two ‘as received’ industrial waste waters such as anaerobic digester effluent. Future work can consider effects including membrane fouling and cleaning for longer term waste water deammonification by ammonia capture.
Hongjiao Pang - One of the best experts on this subject based on the ideXlab platform.
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sustainable waste water deammonification by vacuum membrane distillation without Ph Adjustment role of water chemistry
Chemical Engineering Journal, 2017Co-Authors: Xing Yang, Hongjiao Pang, Jianhua Zhang, Audra Liubinas, Mikel DukeAbstract:Abstract Traditional aerobic processes used for deammonification in waste water treatment plants consume the majority of electrical energy. Ammonia can instead be recovered by membrane distillation but research to date proposes chemically intensive Ph Adjustment to release free ammonia from bulk solutions. Here we propose the novel application of membrane distillation to deammonify waste water without any Ph Adjustment. To demonstrate the concept, it was first shown that simple synthetic ammonia solutions strictly follow the classic ammonia-ammonium relationship with Ph which shows little release as free ammonia until at least Ph 9. However vacuum membrane distillation removed essentially all ammonium in solution as low as Ph 6.1 due to carbonate that is often found in waste waters. Via a novel ‘Ph polarisation and buffering’ mechanism, the functional effect was established due to CO2 released from the liquid-vapour membrane boundary layer causing a Ph rise that released ammonia to the permeate. Via this mechanism, high depletions, up to 99.6%, occurred consistently on solutions containing carbonate and volatile acids at low Ph, including two ‘as received’ industrial waste waters such as anaerobic digester effluent. Future work can consider effects including membrane fouling and cleaning for longer term waste water deammonification by ammonia capture.
Xiaoyan Li - One of the best experts on this subject based on the ideXlab platform.
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effects of Ph Adjustment on the hydrolysis of al enhanced primary sedimentation sludge for volatile fatty acid production
Chemical Engineering Journal, 2018Co-Authors: Xiaoyan LiAbstract:Abstract Aluminum-based chemically enhanced primary sedimentation has seen increasing use in wastewater treatment plants. However, the derived sludge (Al-sludge) has low biodegradability due to the inhibition of Al-coagulants on organic hydrolysis, which increases the difficulty of sludge treatment and limits the potential for resource recovery. In this study, the effects of Ph Adjustment on the pretreatment and fermentation of Al-sludge was investigated, with a focus on sludge hydrolysis and production of volatile fatty acids (VFAs). The effects of abiotic and biotic hydrolysis on sludge disintegration, organics solubilization, and hydrolytic enzyme activity were also evaluated. The results show that Adjustment of the Ph to between 8.0 and 10.0 was more effective than Adjustment to between 2.0 and 6.0 for sludge hydrolysis and subsequent VFA production. The enzymatic activities of protease and α -glucosidase showed a positive correlation with the Ph values, leading to the highest VFA yield (275 mg-COD/g-VS) for the initial Ph 10.0 condition, with 46% improvement over the control reactor (without Ph Adjustment). Semi-continuous fermentation was found to be more effective than batch fermentation for the biotic hydrolysis rate, k H . Little PhosPhorus (
Tzahi Y Cath - One of the best experts on this subject based on the ideXlab platform.
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prevention and management of silica scaling in membrane distillation using Ph Adjustment
Journal of Membrane Science, 2018Co-Authors: John A Bush, Johan Vanneste, Emily M Gustafson, Christopher A Waechter, David Jassby, Craig Turchi, Tzahi Y CathAbstract:Abstract Membrane scaling by silica is a major challenge in desalination, particularly for inland desalination of brackish groundwater or geothermal water, which often contain high concentrations of silica and dissolved solids. Adjustment of feed Ph may reduce silica scaling risk, which is important for inland facilities that operate at high water recoveries to reduce brine disposal costs. However, water recovery of reverse osmosis is also limited due to increased osmotic pressure with feed water concentration. Membrane distillation (MD) is a thermally driven membrane desalination technique that is not limited by increased osmotic pressure of the feed. In this investigation, Ph Adjustment was tested as a strategy to reduce silica scaling risk in the MD process. With feed water Ph less than 5 or higher than 10, scaling impacts were negligible at silica concentrations up to 600 mg/L. Scaling rates were highest at neutral Ph between 6 and 8. Cleaning strategies were also explored to remove silica scale from membranes. Cleaning using NaOH solutions at Ph higher than 11 to induce dissolution of silica scale was effective at temporarily restoring performance; however, some silica remained on membrane surfaces and scaling upon re-exposure to supersaturated silica concentrations occurred faster than with new membranes.
Xing Yang - One of the best experts on this subject based on the ideXlab platform.
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sustainable waste water deammonification by vacuum membrane distillation without Ph Adjustment role of water chemistry
Chemical Engineering Journal, 2017Co-Authors: Xing Yang, Hongjiao Pang, Jianhua Zhang, Audra Liubinas, Mikel DukeAbstract:Abstract Traditional aerobic processes used for deammonification in waste water treatment plants consume the majority of electrical energy. Ammonia can instead be recovered by membrane distillation but research to date proposes chemically intensive Ph Adjustment to release free ammonia from bulk solutions. Here we propose the novel application of membrane distillation to deammonify waste water without any Ph Adjustment. To demonstrate the concept, it was first shown that simple synthetic ammonia solutions strictly follow the classic ammonia-ammonium relationship with Ph which shows little release as free ammonia until at least Ph 9. However vacuum membrane distillation removed essentially all ammonium in solution as low as Ph 6.1 due to carbonate that is often found in waste waters. Via a novel ‘Ph polarisation and buffering’ mechanism, the functional effect was established due to CO2 released from the liquid-vapour membrane boundary layer causing a Ph rise that released ammonia to the permeate. Via this mechanism, high depletions, up to 99.6%, occurred consistently on solutions containing carbonate and volatile acids at low Ph, including two ‘as received’ industrial waste waters such as anaerobic digester effluent. Future work can consider effects including membrane fouling and cleaning for longer term waste water deammonification by ammonia capture.