Application of MgO-modified palygorskite for nutrient recovery from swine wastewater: effect of pH, ions, and organic acids

2019 ◽  
Vol 26 (19) ◽  
pp. 19729-19737 ◽  
Author(s):  
Hao Wang ◽  
Xuejiang Wang ◽  
Jianfu Zhao
Keyword(s):  
Organic Acids ◽  
Swine Wastewater ◽  
Nutrient Recovery ◽  
Effect Of Ph ◽  
Modified Palygorskite

A novel process for organic acids and nutrient recovery from municipal wastewater sludge

2006 ◽  
Vol 53 (12) ◽  
pp. 101-109 ◽  
Author(s):  
Y.-H. Ahn ◽  
R.E. Speece
Keyword(s):  
Organic Acids ◽  
Cost Estimation ◽  
Rainy Season ◽  
High Performance ◽  
Municipal Wastewater ◽  
Ph Control ◽  
Economic Benefits ◽  
Full Scale ◽  
Wastewater Sludge ◽  
Nutrient Recovery

In this paper, a novel process for organic acids and nutrient recovery from municipal sludge was introduced and evaluated based on laboratory-scale studies. An economical estimation for its practical application was also performed by mass balance in a full-scale plant (Q = 158,000 m3 d−1). This novel process comprises an upflow sludge blanket-type high performance elutriated acid fermenter (5 d of SRT) for organic acids recovery followed by an upflow-type crystallisation (3 h of HRT) reactor using waste lime for nutrient recovery. In the system, the fermenter is characterised by thermophilic (55 °C) and alkaline conditions (pH 9), contributing to higher hydrolysis/acidogenesis (0.18 g VFACOD g−1 VSSCOD, 63.3% of VFACOD/COD produced, based on sludge characteristics of the rainy season) and pathogen-free stabilised sludge production. It also provides the optimal condition for the following crystallisation reactor. In the process, the waste lime, which is an industrial waste, can be used for pH control and cation (Ca and Mg) sources for crystallisation reaction. A cost estimation for full-scale application demonstrates that this process has economic benefits (about $67 per m3 of wastewater except for the energy expense) even in the rainy season.

The Effect of pH on Continuous Biohydrogen Production from Swine Wastewater Supplemented with Glucose

2010 ◽  
Vol 162 (5) ◽  
pp. 1286-1296 ◽  
Author(s):  
Yecong Li ◽  
Jun Zhu ◽  
Xiao Wu ◽  
Curtis Miller ◽  
Liang Wang
Keyword(s):  
Biohydrogen Production ◽  
Swine Wastewater ◽  
Effect Of Ph

scholarly journals Effect of pH level and acid type on total ammoniacal nitrogen (TAN) retention and fouling of reverse osmosis membranes processing swine wastewater

2015 ◽  
Vol 50 (4) ◽  
pp. 297-304
Author(s):  
L. Masse ◽  
M. Mondor ◽  
J. Dubreuil
Keyword(s):  
Reverse Osmosis ◽  
Membrane Fouling ◽  
Lower Cost ◽  
Swine Wastewater ◽  
Ammoniacal Nitrogen ◽  
Permeate Flux ◽  
Effect Of Ph ◽  
Canadian Guideline ◽  
Acid Type ◽  
Ph Level

Wastewaters fed to reverse osmosis (RO) membranes sometimes need to be acidified to prevent inorganic fouling and increase total ammoniacal nitrogen (TAN) retention. In this project, the effect of pH level (6.5–7.1) and acid type (HCl vs. H2SO4) on membrane fouling and cleaning as well as permeate flux and quality during the processing of swine wastewater with a spiral-wound RO membrane was investigated. The use of H2SO4 to lower pH produced slightly higher permeate fluxes than HCl and there was no indication of sulfate precipitates on the membrane. Membrane fouling intensity and flux recovery upon cleaning were not affected by pH level or acid type. Lowering swine wastewater pH from 7.1 to 6.5 with HCl reduced TAN concentration in permeate from 142 to 59 mg/L. Using H2SO4 to lower pH to 6.5 further decreased TAN concentration to 39 mg/L. At pH 6.5 with both acid types, the concentration of unionized NH3 in the permeate was below the Canadian guideline of 0.019 mg/L for the release of wastewater to an aquatic environment. The use of H2SO4 would be recommended with swine wastewater, because of lower cost and volumetric input required to lower pH, as well as higher permeate quality and flux.

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