A thermal and non-thermal plasma activated water reactor system, comprising: a) a reaction chamber, wherein said reaction chamber comprises - a gas inlet, - a water inlet, - a combined gas and water outlet, - a ground electrode and reaction electrodes configured to generate, in operation, reactive oxygen species, ROS, and reactive nitrogen species, RNS, in gas form, wherein said gas inlet and said water inlet are disposed off-centre from said reaction chamber and said combined gas and water outlet is disposed at a center of a bottom surface of said reaction chamber or at a height thereof, such that in operation, when water flows there through a vortex movement of water and air is generated so as to mix the water with said ROS and RNS, wherein said reaction electrodes i) comprise a thermal plasma electrode and a non-thermal plasma electrode, wherein said thermal plasma electrode is configured to generate a thermal plasma and wherein said non-thermal plasma electrode is configured to generate a non-thermal plasma, or ii) are configured to be switchable connectable to a power supply so as to generate in operation both the thermal and the non-thermal plasma with predefined duty cycles, wherein the thermal and non-thermal plasma activated water reactor is configured to generate plasma activated water having a pH ranging from 0 to 7, or an oxidation reduction potential, ORP, value ranging from 200 mV to 800 mV, and b) a plasma activated water reservoir, wherein said water reservoir is disposed to receive said plasma activated water from said reaction chamber and disposed to return said plasma activated water to said reaction chamber. a) a reaction chamber, wherein said reaction chamber comprises - a gas inlet, - a water inlet, - a combined gas and water outlet, - a ground electrode and reaction electrodes configured to generate, in operation, reactive oxygen species, ROS, and reactive nitrogen species, RNS, in gas form, wherein said gas inlet and said water inlet are disposed off-centre from said reaction chamber and said combined gas and water outlet is disposed at a center of a bottom surface of said reaction chamber or at a height thereof, such that in operation, when water flows there through a vortex movement of water and air is generated so as to mix the water with said ROS and RNS, wherein said reaction electrodes i) comprise a thermal plasma electrode and a non-thermal plasma electrode, wherein said thermal plasma electrode is configured to generate a thermal plasma and wherein said non-thermal plasma electrode is configured to generate a non-thermal plasma, or ii) are configured to be switchable connectable to a power supply so as to generate in operation both the thermal and the non-thermal plasma with predefined duty cycles, wherein the thermal and non-thermal plasma activated water reactor is configured to generate plasma activated water having a pH ranging from 0 to 7, or an oxidation reduction potential, ORP, value ranging from 200 mV to 800 mV, and - a gas inlet, - a water inlet, - a combined gas and water outlet, - a ground electrode and reaction electrodes configured to generate, in operation, reactive oxygen species, ROS, and reactive nitrogen species, RNS, in gas form, i) comprise a thermal plasma electrode and a non-thermal plasma electrode, wherein said thermal plasma electrode is configured to generate a thermal plasma and wherein said non-thermal plasma electrode is configured to generate a non-thermal plasma, or ii) are configured to be switchable connectable to a power supply so as to generate in operation both the thermal and the non-thermal plasma with predefined duty cycles, b) a plasma activated water reservoir, wherein said water reservoir is disposed to receive said plasma activated water from said reaction chamber and disposed to return said plasma activated water to said reaction chamber. <EOS>