A complex malodor removing equipment includes: a neutralizing module which dissolves a portion of malodor-causing substances, in malodorous gas introduced from malodor-producing equipment, in liquid water and removes same, which includes an acidity neutralizing module that introduces an alkaline substance from outside and removes an acidic malodor-causing substance from the malodor-causing substances, and an alkaline neutralizing module that introduces an acidic substance from outside and removes an alkaline malodor-causing substance from the malodor-causing substances, and which connects the acidity neutralizing module and the alkaline neutralizing module; and a balancing module which dissolves the remainder of the malodor-causing substances, in the malodorous gas introduced from the neutralizing module, in water and removes same, which includes an oxidation balancing module that introduces an oxidizing agent from outside and balances the malodor-causing substances, and a reduction balancing module that introduces a reducing agent from outside and balances the malodor-causing substances.

The present invention is a process, a method, and system for recovery and concentration of dissolved ammonium bicarbonate from a wastewater containing ammonia (NH3) using gas separation, condensation, filtration, and crystallization, each at controlled operating temperatures. The present invention includes 1) removal of ammonia from waste (sludges, semi-solids, and solids and liquids) without the use of chemicals at a temperature of at least 80 degrees Celsius, 2) mixing of the gaseous ammonia with carbon dioxide and water vapor and concentrating dissolved ammonium carbonate and ammonium bicarbonate using reverse osmosis at a temperature of between about 35 and 50 degrees Celsius, and 3) crystallizing concentrated dissolved ammonium carbonate and ammonium bicarbonate at a temperature of less than about 35 degrees Celsius to form solid ammonium bicarbonate and ammonium carbonate.

The present disclosure discloses a method for capturing and removing carbon oxide using photo-cultivation, the method including a carbonic anhydrase providing step in which carbonic anhydrase is provided to culture medium as a reaction catalyst; a carbon dioxide supplying step in which a processing object gas containing carbon dioxide is supplied to the carbonic anhydrase and the culture medium; a carbon dioxide converting step in which the carbon dioxide comes into contact with the carbonic anhydrase and the culture medium to convert the carbon dioxide into inorganic carbonic acid; and a carbon oxide consuming step in which the inorganic carbonic acid is employed and consumed in photosynthesis of microalgae contained in the culture medium.

A chemical substance concentrator includes a channel allowing a sample containing a chemical substance to flow in a flowing direction in the channel, and a cell wall partitioning the channel into adsorption cells. Each of adsorption cells includes first and second electrodes disposed on the cell wall apart from each other and an adsorption device that adsorbs the chemical substance. The adsorption device contains metal oxide. The absorption device is disposed at a position contacting the first electrode and the second electrode such that the first and second electrodes are electrically connected via the adsorption device.

A compound of the general formula (I)

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in which R.sub.1, R.sub.2 and R.sub.3 are independently selected from C.sub.1-4-alkyl and C.sub.1-4-hydroxyalkyl; each R.sub.4 is independently selected from hydrogen, C.sub.1-4-alkyl and C.sub.1-4-hydroxyalkyl; each R.sub.5 is independently selected from hydrogen, C.sub.1-4-alkyl and C.sub.1-4-hydroxyalkyl; m is 2, 3, 4 or 5; n is 2, 3, 4 or 5; and o is an integer from 0 to 10. A preferred compound of the formula (I) is 2-(2-tert-butylaminoethoxy)ethylamine. Absorbents comprising a compound of the formula (I) have rapid absorption of carbon dioxide from fluid streams and are also suitable for processes for the simultaneous removal of H.sub.2S and CO.sub.2, where given H.sub.2S limits have to be observed but complete removal of CO.sub.2 is not required.

Methods of producing a treated gas by removing nitrogenous compounds are disclosed. Methods of recovering ammonia from a gas stream having nitrogenous compounds are disclosed. Methods of producing a fertilizer product from organic waste are disclosed. The methods may include introducing aqueous sulfurous acid into a gas stream having nitrogenous compounds to absorb the nitrogenous compounds in a liquid and produce a treated gas. The methods may also include maintaining the pH of certain solutions above 5 or introducing an oxidant into certain solutions to produce sulfate ions. Systems for removing nitrogenous compounds including a reaction subsystem, a solids-liquid separator, a temperature control subsystem, an oxidation control subsystem, and a recirculation line are also disclosed. The systems may be employed to remove nitrogenous compounds from a gas stream, recover the ammonia from the gas stream, or produce a fertilizer product from the recovered ammonia.

The present invention is directed to a process for removing gas phase nitrogen-based compounds by absorption into a liquid stream. The absorbed nitrogen-based compound is reacted with an acid to produce a nitrogen-based product. The nitrogen-based compound, the acid, and the resulting nitrogen-based product may be organic compounds, i.e. compounds derived from animal matter or plant matter. The nitrogen-based product may be a fertilizer, such as ammonium acetate or ammonium citrate that may be certified as organic. Processes are also described for removing nitrogen-based compounds from a liquid stream to produce a nitrogen-based product, including organic fertilizers. One process includes producing cavitation bubbles into which a liquid phase nitrogen-based compound is stripped, followed by absorption to produce a nitrogen-based product. Another process includes the use of a degassing membrane to remove a liquid phase nitrogen-based compound that is degassed to produce a nitrogen-based product, including organic fertilizers.

The invention relates to methods and equipment for treating industrial vapor and liquid waste streams to remove certain compounds and concentrate those compounds to produce a chemical product. Specifically, the invention related to methods and equipment for condensing vapor waste streams and combining those streams with other liquid waste streams, and processing those combined streams to separate certain compounds for further processing into a chemical product, such as a fertilizer, and to thereby to reduce pollution, odor, and nutrient loading to air and water resources and wastewater processing systems.

The invention provides a gas purification system, for instance for agricultural application comprising a corona discharge system, the corona discharge system comprising a counter electrode, a conductive strip with a longitudinal edge comprising tooth structures, wherein the tooth structures have tooth tops with shortest distances selected from the range of 2-200 mm; and a voltage generator configured to apply a DC voltage of at least 10 kV to the conductive strip.

An animal shed system includes an animal shed having an animal shed floor with a first and a second surface spaced apart, such that the floor has a thickness different from zero, and multiple flow holes extending from the first to the second surface; a reservoir situated under the animal shed floor, wherein the flow holes open up to the reservoir, and the flow holes allow a fluid flow from the animal shed to the reservoir; a floor opening in the animal shed floor to allow manure to be dumped in the reservoir; an air extraction device for extracting air underneath the floor, out of the reservoir; and a device extending from the floor opening into the reservoir, wherein the device is configured to prevent an airflow from the animal shed to the reservoir through the floor opening when in use.