An aqueous stream cleaning system including a circulation pump to receive a waste fluid and/or a concentrated liquid bottoms stream, and expel a circulation stream. The aqueous stream cleaning system can also include a primary heat exchanger to receive the circulation stream from the circulation pump. The primary heat exchanger can have a plurality of heat exchange plates that define an internal surface area for heat transfer from a distillate stream to the circulation stream to produce a cooled distillate stream and a heated circulation stream. The plurality of heat exchange plates can be spaced to facilitate free flow of solids in the circulation stream between the plurality of heat exchange plates. A mass flow rate and pressure of the circulation stream can be configured to minimize build-up of solids in the primary heat exchanger. The aqueous stream cleaning system can further include an evaporation unit to receive the heated circulation stream from the primary heat exchanger. The distillate stream is formed when steam in the heated circulation stream evaporates in the evaporation unit, and the concentrated liquid bottoms stream is formed from a portion of the heated circulation stream that does not evaporate.

The disclosure belongs to the technical field of flue gas treatment and provides a method for denitration of flue gas. The method includes in the presence of anammox bacteria, subjecting a NO.sub.x-containing flue gas and an ammonia water to an anammox reaction.

A hybrid activated iron-biological treatment system and method for treating wastewater. The treatment system includes a combination of zero valent iron, ferrous iron, an iron oxide, and a denitrification microorganism.

In one aspect, systems and methods for the efficient and cost-effective removal of bromide from wastewater streams are described herein. Briefly, a system for bromide removal comprises pretreatment apparatus operable for at least partial removal of background ionic species from the wastewater stream and/or dilution of the background ionic species in the wastewater stream. The system also comprises bromide capture apparatus operable for removal of bromide from the pretreated wastewater stream, wherein the system removes bromide from the wastewater stream at an efficiency of at least 80 percent. In some embodiments, bromide is recovered from the capture apparatus and reused in flue gas treatment applications.

One disclosed system includes: (a) a fan directing an initial air stream to a heater with sufficient heating capacity to heat said initial airstream to a temperature of 200° C. to 350° C. and output a heated air stream; and (b) an air to air heat exchanger positioned and configured to use said heated air stream to preheat said initial airstream prior to its arrival at said heater. Additional systems and corresponding methods are disclosed.

A membrane module includes a housing. The housing includes a housing, comprising: a first plurality of porous hollow fiber membranes, and a second plurality of porous hollow fiber membranes different from the first plurality of porous hollow fiber membranes. The first plurality of porous hollow fiber membranes has a first length, and the second plurality of porous hollow fiber membranes has a second length that is at least 1.1 times greater than the first length. The membrane module can be used in separation methods, such as membrane distillation methods.

A method for efficiently removal of oxidised selenium from liquid, such as FGD wastewater. The method involves adding a non-iron-based reducing agent (e.g. sodium dithionite) and preferably Fe(II) ions to the liquid at a pH of above 7.5 or 8 and precipitating elemental selenium from the liquid.

A water generation system for a vehicle comprises: a first container to collect liquid water generated from the condensation of water vapor; a filter to filter the liquid water, the filter in fluid flow communication with the first container; a second container to store the liquid water that the filter filtered, the second container (i) in fluid flow communication with the filter and (ii) configured to hold a larger volume of the liquid water than the first container; and a source of ultraviolet light that, when activated, emits the ultraviolet light into at least one of the first container and the second container. The water generation system can further comprise an agitator that is configured to agitate the liquid water disposed within either the first container or the second container, and a cooling element configured to withdraw heat from the liquid water within the water generation system.

The present invention provides a flocculant for catalytic decomposition of flue gas desulfurization wastewater treatment. The flocculant includes polyacrylamide, inorganic polymer, and an inorganic compound with low molecular weight. In the condition of using proper components, the flocculant has significant wastewater treatment performance.

The present invention provides a waste-liquid processing device, comprising: a first processing device and a mixing device, wherein the first processing device is provided with a first purifying unit for processing waste liquid from a waste liquid source to produce a purified liquid. The mixing device is used for mixing the purified liquid with a chlorine dioxide solution. The present invention also provides an air-pollution treatment device, comprising the waste-liquid processing device and a gas processing device. The gas processing device comprises an air extracting unit, a gas purifying unit, a gas-liquid separation unit, and an exhausting unit.