A pet water fountain is described comprising a bowl for holding an aqueous drinking fluid. The pet water fountain includes a housing configured to cover a portion of the bowl and have a fluid reservoir. The pet water fountain includes a rotatable cone positioned within the housing, the cone tapering outwardly from a bottom end to a top end, the bone bottom end having a fluid inlet to allow the passage of fluid from the bowl through the inlet and into the interior of the conde, the cone top end being in fluid communication with the housing fluid reservoir. The pet water fountain includes a filter ring coupled to the cone top end, the filter ring having an exterior housing and a filter media positioned within the exterior housing, and an electric motor coupled to the rotatable cone for rotatably driving the rotatable cone.

Modular system of drying humid material, comprising a drier housing having a material inlet and outlet, a drying gas inlet and outlet, a particle separator downstream of drier housing. Drier housing comprises drying chambers. The system further comprises an air fan, and a heater. A gas duct connecting drying gas inlet and drying gas outlet defines a closed loop. A condenser is arranged in gas duct. Drying chambers comprises a rotary impeller means, and drying gas inlets. A dried-hot product cooler comprising a housing having a dried-hot product inlet, a cooled dried product outlet, a cool air supply means, and a fan arranged to draw cooled air through dried hot product in cooler.

A waste reduction system that utilizes organic solids suspended in a waste stream to produce carboxylic acids, which can then be employed as an input to a microbial fuel cell or other biological processes to further enhance biogas production, is provided. The organic waste stream influent undergoes a multistage fermentation process in which fermentative microorganism metabolize the organic waste materials and produce one or more carboxylic acids, especially short chain fatty acids. The carboxylic acids serve as a food source for bacteria within an anode compartment of an MFC that generates useable electricity therefrom.

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 crop-livestock circulation system, including a planting greenhouse, a fish pond and a livestock greenhouse. A rear portion of the livestock greenhouse is provided with a drinking trough. A first side of the livestock greenhouse is provided with a scraper. A portion of a bottom plate close to a second side of the livestock greenhouse is provided with a collection port. A bottom of the collection port is provided with a manure collection trough connected to a fermentation treatment chamber. The fish pond is provided with a sewage discharge port connected to a sewage collection unit. The sewage collection unit is connected to the fermentation treatment chamber. The fermentation treatment chamber is connected to a conveying unit, which is connected to a spraying device. The spraying device is provided in the planting greenhouse.

Increased control and efficiency over the wastewater purification can be achieved by allowing to selectively prioritize catabolic over anabolic processes via prioritization of the digestive function of microorganism in the activated sludge. The gas-dispersion return sludge is created using pure oxygen or oxygen containing trace amounts of ozone, which is blended with return sludge to create a mixture of gas and liquid, which is passed through an atomizer or a pump to instantly render the reactive gas to an ultra-fine bubble state. At least a portion of the ultra-fine bubbles dissolve within the sludge, raising oxygen to a critical level within a short time, activating the dormant microorganisms. The microorganism accumulate enough cATP upon initial encounter with the pollutants to prioritize their digestive function, and when exposed to pollutants present in wastewater, digest the pollutants using biochemical pathways different from the ones used in nature.

Apparatuses and methods for utilizing different algal growth techniques to filter aquarium water under varying conditions, including freshwater, brackish, and saltwater, and including amounts of nutrients (including ammonia, nitrite, nitrate, phosphate, CO2) which vary from low to high levels. Also disclosed are embodiments to operate above water, submerged, or any combination thereof, in separate or synergistic configurations, as well as embodiments to utilize faster-growing algal species to out-compete and overgrow slower-growing species.