Biochar water treatment

A method, comprising:

• pyrolyzing a biomass to produce biochar and heat, steam and/or syngas;
• generating electrical energy from the heat, steam and/or syngas;
• at least partially powering a wastewater treatment system from the electrical energy, the wastewater treatment system comprising a fluid flow pathway, comprising a wastewater inlet for introducing a wastewater stream to the pathway, a biochar inlet, a metal salt inlet, an ozone inlet and a reactor;
• a filter downstream of the reactor and biochar inlet, the filter fluidly coupled to the fluid flow pathway;
• a treated water outlet fluidly coupled to the filter;
• a reject stream outlet fluidly coupled to the filter;
• and a solids separator fluidly coupled to the reject stream outlet;
• introducing a wastewater stream comprising at least one contaminant to the wastewater treatment system;
• adding the biochar to the wastewater stream;
• adding an iron salt to the wastewater stream;
• adding ozone to the wastewater stream;
• mixing the biochar, iron salt and ozone with the wastewater stream in a plug flow reactor;
• filtering the wastewater stream in a moving bed reactive sand filter to produce a treated water stream and a reject stream comprising solids;
• removing the solids from the reject stream to produce a recycled water stream and a solid product;
• and
• formulating the solid product into a form suitable for application to agricultural, silvicultural, residential, commercial, or municipal land or horticultural soil containers.