These is provided a process and a system for treating a livestock waste and produce fertilizers. The process can include subjecting a livestock waste to a preparation treatment to produce a stabilized livestock waste, the preparation treatment including aerating the livestock waste with an oxygen-containing gas. The process can further include subjecting the stabilized livestock waste to a bioreaction treatment to produce an aerated livestock product. The bioreaction treatment can include aerating the stabilized livestock waste with an oxygen-containing gas that can be supplied by a distribution system to enable aerobic reactions to occur within the stabilized livestock waste. The aerated livestock product can include a solid component and a liquid component, and can be further separated in a solid-liquid separation treatment to produce respective fertilizers, or be used as is as a fertilizer.

Devices, systems, and methods for drying a bulk waste product, such as animal waste, having a moisture content of 95% or more water can include a trough configured to receive the bulk waste product and to dispense it in a form suitable for convective drying, one or more conveyors having an air-permeable conveyor belt, each conveyor receiving the waste product from the trough and transporting the waste product along a transport path; and one or more air moving devices (AMDs) that pass air through the air-permeable conveyor belt and across the waste product as it is transported along the transport path to transform the bulk waste product into a dried waste product having a moisture content of about 5% to about 20%, inclusive.

Devices, systems, and methods for drying a bulk waste product, such as animal waste, having a moisture content of 95% or more water can include a trough configured to receive the bulk waste product and to dispense it in a form suitable for convective drying, one or more conveyors having an air-permeable conveyor belt, each conveyor receiving the waste product from the trough and transporting the waste product along a transport path; and one or more air moving devices (AMDs) that pass air through the air-permeable conveyor belt and across the waste product as it is transported along the transport path to transform the bulk waste product into a dried waste product having a moisture content of about 5% to about 20%, inclusive.

Disclosed is a method for reducing methane emission from slurry produced in a livestock farm. The method comprising the steps of guiding unheated slurry from the livestock farm to a slurry heat exchanger, raising the temperature of the unheated slurry in the slurry heat exchanger to at least 65# Celsius, guiding the at least 65# Celsius hot slurry to an intermediate slurry tank, raising the temperature of the heated slurry to at least 75# Celsius in the intermediate slurry tank, guiding the at least 75# Celsius hot slurry through the slurry heat exchanger to exchange heat with the unheated slurry to raise the temperature of the unheated slurry to the at least 65# Celsius and to cool the at least 75# Celsius hot slurry to at least below 40# Celsius, and guiding the at least below 40# Celsius cold slurry to a slurry reservoir. Furthermore, a slurry treatment plant for reducing methane emission from slurry is disclosed.

Disclosed is a method for reducing methane emission from slurry produced in a livestock farm. The method comprising the steps of guiding unheated slurry from the livestock farm to a slurry heat exchanger, raising the temperature of the unheated slurry in the slurry heat exchanger to at least 65# Celsius, guiding the at least 65# Celsius hot slurry to an intermediate slurry tank, raising the temperature of the heated slurry to at least 75# Celsius in the intermediate slurry tank, guiding the at least 75# Celsius hot slurry through the slurry heat exchanger to exchange heat with the unheated slurry to raise the temperature of the unheated slurry to the at least 65# Celsius and to cool the at least 75# Celsius hot slurry to at least below 40# Celsius, and guiding the at least below 40# Celsius cold slurry to a slurry reservoir. Furthermore, a slurry treatment plant for reducing methane emission from slurry is disclosed.

A system and a method for treating biomass with a gas includes at least one conduit having at least one biomass inlet and at least one biomass outlet, at least one gas inlet and at least one gas outlet. The system further includes a transport unit configured to move the biomass through the conduit from the at least one biomass inlet to the at least one biomass outlet thereby defining a biomass transport direction. The system is configured such that gas flowing from the at least one gas inlet to the at least one gas outlet crosses the biomass transport direction.

A system and a method for treating biomass with a gas includes at least one conduit having at least one biomass inlet and at least one biomass outlet, at least one gas inlet and at least one gas outlet. The system further includes a transport unit configured to move the biomass through the conduit from the at least one biomass inlet to the at least one biomass outlet thereby defining a biomass transport direction. The system is configured such that gas flowing from the at least one gas inlet to the at least one gas outlet crosses the biomass transport direction.

A method of producing compost from animal waste may include placing animal waste in a waste pit. The method may include removing liquid from a top layer of the waste pit. The waste pit may include a bottom layer disposed at a bottom of the waste pit and adjacent the top layer. The bottom layer may be composed primarily of solids. The top layer may be composed primarily of liquid. After removing the liquid from the top layer of the waste pit, the method may include agitating the waste pit to mix the top layer and the bottom layer and create sludge. The method may include pumping the sludge into a system of channels in fluid communication with each other. Each of the channels may be sloped downwardly such that the sludge travels by gravity through the system of channels.

A method of producing compost from animal waste may include placing animal waste in a waste pit. The method may include removing liquid from a top layer of the waste pit. The waste pit may include a bottom layer disposed at a bottom of the waste pit and adjacent the top layer. The bottom layer may be composed primarily of solids. The top layer may be composed primarily of liquid. After removing the liquid from the top layer of the waste pit, the method may include agitating the waste pit to mix the top layer and the bottom layer and create sludge. The method may include pumping the sludge into a system of channels in fluid communication with each other. Each of the channels may be sloped downwardly such that the sludge travels by gravity through the system of channels.

For qualitative and quantitative production of biogas, nanoparticles and use of macroalgae when added to AD feedstock at proper concentration, temperature and time of digestion can bring a revolution to meet the future needs of energy. The process of biofuel production can be altered by using various nanomaterials in various ways, such as by improving the stability of cellulose enzymes, enhancing the catalytic production of biohydrogen, and improving biological and chemical digestion. This influence of nanoparticles on the process is determined by their distinct catalytic activity based on structure, shape and size which is complementary to the relevant process. The addition of seaweed in the AD feedstock improves biogas output and digestate quality thus enhancing the economic viability with the simultaneous positive impact of reducing global warming.