The present invention discloses a method for ammonium-enhanced flue gas desulfurization (FGD) by using red mud slurry. The method specifically includes: crushing red mud, sieving the crushed red mud, slurrying the red mud, conducting aeration treatment, adding an ammonium salt and/or ammonia, and conducting natural sedimentation to obtain pretreated red mud slurry and pretreated red mud liquor; adding an ammonium salt and/or ammonia to the slurry, adding water and conducting uniform mixing, conducting pre-FGD, conducting deep desulfurization on treated flue gas by using the pretreated red mud liquor, and directly discharging desulfurized flue gas; and charging the pretreated red mud slurry and the pretreated red mud liquor obtained after the treatment to a replacement tank below, adding lime milk to the replacement tank, conducting stirring and natural sedimentation, conducting soilization on subnatant thick red mud slurry, and refluxing the supernatant to a red mud aeration tank.

Liquid nutrients are continuously applied to a first group of rows of standing crops by pulling a drag hose from a reel located at one end of a field and between two crop rows with a boom having one end pivotally connected to an applicator and a tractor. The boom provides a liquid supply line from the drag hose to the center or one end of the applicator. At the opposite end of the field, the tractor and applicator turn 180° while the boom pivots to project from one end of the applicator to the drag hose. The tractor returns down adjacent rows back to the first end of the field with the boom projecting to the drag hose while the reel simultaneously retracts the hose between the two crop rows. The reel is moved axially to a third group of rows, and the steps are repeated.

Abstract: Disclosed is a liquid nutrient spreader and liquid nutrient spreader system. The liquid nutrient spreader system can include a spreader unit that can be moved in a direction of movement by a mover, which can be a tractor. The spreader unit can be mobile, being supported on the ground by wheels or tracks. The spreader unit can include a frame that supports a hose reel onto which is reeled a supply hose. The supply hose provides for fluid communication of liquid nutrients between a liquid nutrient storage unit to a fluid distributor, and eventually to a one or more of a plurality of injectors mounted to an incorporation toolbar.

A system and method produces nitrogen-based fertilizer, which is synthesized from air and water using renewable electricity, mainly from solar energy and low-temperature plasma technology and stored prior to distributing to plants via drip irrigation. The process of liquid fertilizer generation and system description are presented. A glass reactor with a digital 3D-printed end flange is utilized as a reactor chamber. The system and method synthesize a product that is primarily a liquid nitrate (NO.sub.3.sup.−) based fertilizer in an aqueous solution.

A system and a method for reducing emission of greenhouse gasses is provided, in particular at least one of methane, laughing gas, nitrogen oxides, and ammonia from slurry stored in one or more slurry storage tanks. The method includes continuously maintaining slurry stored in a slurry storage tank under acidic conditions. The method includes the steps of: A: monitoring pH in the slurry present in the slurry storage tank by one or more pH sensors arranged in contact with the slurry in the slurry storage, B: checking if the detected pH exceeds above an upper threshold, such as an upper threshold set at pH=7, C: activate acid addition when the monitored pH exceeds the upper threshold, D: while stirring, adding acid until pH in the slurry is adjusted to within a range between the upper threshold and a lower threshold, such as between pH=2 and pH=7, in particular between pH=5 to pH=7, or more preferred pH=5 and pH=6, and repeating steps C-D when the detected pH of step A exceeds the upper threshold.

The present invention discloses a method for ammonium-enhanced flue gas desulfurization (FGD) by using red mud slurry. The method specifically includes: crushing red mud, sieving the crushed red mud, slurrying the red mud, conducting aeration treatment, adding an ammonium salt and/or ammonia, and conducting natural sedimentation to obtain pretreated red mud slurry and pretreated red mud liquor; adding an ammonium salt and/or ammonia to the slurry, adding water and conducting uniform mixing, conducting pre-FGD, conducting deep desulfurization on treated flue gas by using the pretreated red mud liquor, and directly discharging desulfurized flue gas; and charging the pretreated red mud slurry and the pretreated red mud liquor obtained after the treatment to a replacement tank below, adding lime milk to the replacement tank, conducting stirring and natural sedimentation, conducting soilization on subnatant thick red mud slurry, and refluxing the supernatant to a red mud aeration tank.

Liquid nutrients are continuously applied to a first group of rows of standing crops by pulling a drag hose from a reel located at one end of a field and between two crop rows with a boom having one end pivotally connected to an applicator and a tractor. The boom provides a liquid supply line from the drag hose to the center or one end of the applicator. At the opposite end of the field, the tractor and applicator turn 180 while the boom pivots to project from one end of the applicator to the drag hose. The tractor returns down adjacent rows back to the first end of the field with the boom projecting to the drag hose while the reel simultaneously retracts the hose between the two crop rows. The reel is moved axially to a third group of rows, and the steps are repeated.

Liquid nutrients are continuously applied to rows of standing crops by pulling a drag hose from a reel located at one end of a field and between two crop rows with a boom having a forward end pivotally connected to an applicator mounted on a tractor and a rearward end supported by a wheel. The boom carries a supply line having a rearward end connected to the drag hose and a forward end connector to the applicator having the same length as the boom. At the opposite end of the field, the tractor and applicator turn 180 while the boom passes over the applicator. The tractor returns down a second plurality of rows back to the first end of the field while the reel simultaneously retracts the hose between the two rows of crops. The reel is moved to a third plurality of rows the steps are repeated.

Disclosed is a pipe bridge and methods for using the same. The pipe bridge includes a bridging framework and a pipe coupled thereto. The bridging framework is movable between a retracted position and a raised position. Fluid can flow through the pipe or a hose supported by the bridging framework.