TY - JOUR
T1 - Hydrogen Gas Recycling for Energy Efficient Ammonia Recovery in Electrochemical Systems
AU - Kuntke, Philipp
AU - Arredondo, Mariana Rodriguez
AU - Widyakristi, Laksminarastri
AU - ter Heijne, Annemiek
AU - Sleutels, Tom H. J. A.
AU - Hamelers, Hubertus V. M.
AU - Buisman, Cees J. N.
PY - 2017/3/7
Y1 - 2017/3/7
N2 - Recycling of hydrogen gas (H-2) produced at the cathode to the anode in an electrochemical system allows for energy efficient TAN (Total Ammonia Nitrogen) recovery. Using a H-2 recycling electrochemical system (HRES) we achieved high TAN transport rates at low energy input. At a current density of 20 A m(-2), TAN removal rate from the influent was 151 g(N) m(-2) d(-1) at an energy demand of 26.1 kJ g(N)(-1). The maximum TAN transport rate of 335 g(N) m(-2) d(-1) was achieved at a current density of 50 A m(-2) and an energy demand of 56.3 kJ g(N)(-1). High TAN removal efficiency (73-82%) and recovery (60-73%) were reached in all experiments. Therefore, our HRES is a promising alternative for electrochemical and bioelectrochemical TAN recovery. Advantages are the lower energy input and lower risk of chloride oxidation compared to electrochemical technologies and high rates and independence of organic matter compared to bioelectrochemical systems.
AB - Recycling of hydrogen gas (H-2) produced at the cathode to the anode in an electrochemical system allows for energy efficient TAN (Total Ammonia Nitrogen) recovery. Using a H-2 recycling electrochemical system (HRES) we achieved high TAN transport rates at low energy input. At a current density of 20 A m(-2), TAN removal rate from the influent was 151 g(N) m(-2) d(-1) at an energy demand of 26.1 kJ g(N)(-1). The maximum TAN transport rate of 335 g(N) m(-2) d(-1) was achieved at a current density of 50 A m(-2) and an energy demand of 56.3 kJ g(N)(-1). High TAN removal efficiency (73-82%) and recovery (60-73%) were reached in all experiments. Therefore, our HRES is a promising alternative for electrochemical and bioelectrochemical TAN recovery. Advantages are the lower energy input and lower risk of chloride oxidation compared to electrochemical technologies and high rates and independence of organic matter compared to bioelectrochemical systems.
KW - BIOELECTROCHEMICAL SYSTEMS
KW - HUMAN URINE
KW - WASTE-WATER
KW - REMOVAL
KW - NUTRIENTS
KW - CELL
U2 - 10.1021/acs.est.6b06097
DO - 10.1021/acs.est.6b06097
M3 - Article
C2 - 28169520
SN - 0013-936X
VL - 51
SP - 3110
EP - 3116
JO - Environmental science & technology
JF - Environmental science & technology
IS - 5
ER -