The invention relates to a process for working up alkaline waste water which is formed during washing of crude nitrobenzene obtained by nitration of benzene, wherein (i) the alkaline waste water is heated under an increased pressure with respect to atmospheric pressure with exclusion of oxygen and is then cooled and expanded; (ii) the waste water obtained in (i) is purified further by stripping with a stripping gas and the stripping gas stream loaded with impurities is then cooled to a temperature of from 10° C. to 60° C.; and (iii) the liquid process product obtained in (ii) by cooling the stripping gas stream loaded with impurities is separated into an aqueous and an organic phase and the organic phase is used further in an aniline production process.

A foam intercept system and a method of using the foam intercept system are disclosed herein. The foam intercept system is useful to control levels of foam generated on the surface of effluent seawater during aeration of the effluent seawater in a seawater aeration basin. Effluent seawater contained within the seawater aeration basin may be produced in a seawater flue gas desulfurization system associated with a power plant or an aluminum production plant.

A scrubber wastewater treatment method, according to one possible embodiment, includes obtaining a measurement of a turbidity or of a suspended substance concentration of scrubber wastewater and, upon determining that measurement of turbidity or suspended substance concentration is within a certain range, performing treatment. A scrubber wastewater treatment device, according to one possible embodiment, includes a magnetic powder adding device controllable to add a magnetic powder to be added to scrubber wastewater having been generated by treating combustion exhaust gas in a scrubber, and a controller configured to control an amount of the magnetic powder added by the magnetic powder adding device in accordance with a measurement value obtained by a sensor.

A portable water recycling and treatment system and process for used and produced flowback frac water pumps the water from a collection tank through a series of dedicated hydration, retention and filtering tanks and vessels that provide treatment for the removal of chemicals, sediments and other containments. The system, which is enclosed, can be readily assembled on-site by interconnecting the dedicated tanks, vessels and pumps. The tanks and vessels may be situated in a plurality of trailers/units that are transported separately to the site.

A system and method of treating sour water, including providing sour water having hydrosulfide ions and a carbon-containing compound to an anodic chamber of an electrolyzer vessel, converting the hydrosulfide ions into sulfate ions in the anodic chamber via an oxido half-reaction of a first oxido-reduction reaction and generating carbon dioxide in the anodic chamber via an oxido half-reaction of a second oxido-reduction reaction associated with the carbon-containing compound. The technique includes reacting the carbon dioxide with hydroxide ions in the anodic chamber to generate bicarbonate ions. The technique includes discharging an anodic chamber solution having the sulfate ions and the bicarbonate ions from the electrolyzer vessel from the anodic chamber.

A method may include: introducing triglycerides, hydrogen, and a sulfiding agent into a hydroprocessing reactor; reacting the triglycerides with the hydrogen in the hydroprocessing reactor to form at least paraffins; separating at least a portion of a hydroprocessing reactor effluent from the hydroprocessing reactor in a first phase separator to produce a first sour water stream comprising water and a first quantity of hydrogen sulfide and a paraffin stream comprising at least a portion of the paraffins; introducing the first sour water stream into a sour water stripper and stripping the first sour water stream to form a gaseous stream comprising at least a portion of the first quantity of the hydrogen sulfide from the first sour water stream; and contacting the gaseous stream with an acidified wash water in an ammonia removal unit to produce an aqueous ammonia solution stream and a treated gaseous hydrogen sulfide stream; and introducing the treated hydrogen sulfide stream into the hydroprocessing reactor. The aqueous ammonia solution stream is neutralized with an acid to form an ammonium salt solution product.

A system containing a reactor vessel including zero valent iron media, a source of a conditioning additive, a source of a reaction additive, and a process control subsystem is disclosed. A method for reducing a concentration of one or more contaminants in contaminated water including contacting zero valent iron media with a conditioning additive, contacting contaminated water with conditioned zero valent iron media, and introducing a reaction additive is also disclosed. The conditioning additive and reaction additive may each contain an aluminum salt.

A water purification system, a water dispenser and a washing basin applying the same for purifying a raw water to be treated without filtering to a usable fresh water. The water purification system includes a water filtering device coupled to a water intake to filter a raw water to be treated; a first water storage tank coupled to the water filtering device for storing the raw water after being filtered; a nebulization device coupled to the first water storage tank for nebulizing the raw water after being filtered into a water fog; a condensation device coupled to the nebulization device for condensing the water fog; and a second water storage tank coupled to the condensation device for storing a recycled water generated by condensing the water fog.

A method for removing or preventing a microbial growth, biofilm, biomass and/or mineral deposit on a hard surface inside an SO.sub.2 scrubber is disclosed. In particular, biocide compositions may be dosed in pulse or continuously for the reduction and prevention of biofilms on the hard surfaces inside an SO.sub.2 scrubber. A biocide composition disclosed here uses one or more non-oxidizing biocides, especially a mixture of one or more quaternary ammonium compounds and one or more other biocides.

A treatment process for preparing a remediated liquid from a contaminated liquid originally containing more than 5 ppm hydrogen sulfide (H.sub.2S) and substantially without formation of precipitate, includes steps of steps of adding an aqueous solution containing at least one hydroxide compound at a collective concentration of 35-55 wt % to the contaminated liquid to achieve a concentration of 125-5000 ppm of the hydroxide compounds in the contaminated liquid, adding a fulvic acid and/or a humic acid to the contaminated liquid to achieve a concentration of 0.01-10 ppm of the acid(s) in the contaminated liquid, and dispersing the aqueous solution and the at least one organic acid in the contaminated liquid and allowing the aqueous solution and the at least one organic acid to react with the contaminated liquid for a period of time until a concentration of hydrogen sulfide in the contaminated liquid is reduced to ≤5 ppm.