6 results about "Groundwater nitrate" patented technology

The invention provides a reduction-reduction-irrigation triple underground water nitrate non-point source pollution regulation and control method, which comprises the following steps of: constructing an earth surface-underground linkage pollution treatment path by adopting measures of earth surface source control, nitrogen fertilizer reduction, tail end enhanced self-purification, straw returning to field, polluted underground water recycling, fertilizer and water irrigation and the like; and a new non-point source pollution prevention and control strategy of strengthening underground water nitrate self-purification by earth surface agricultural measures is created for the first time. By means of the three-in-one earth surface regulation and control measure of nitrogen fertilizer application reduction, straw returning to field and fertilizer water irrigation, the application amount of chemical fertilizer in agricultural activities is reduced, the in-situ attenuation efficiency of underground water nitrate non-point source pollution is improved, the limitation of slow attenuation of traditional in-situ remediation is broken through, the environmental pollution risk caused by straw incineration is reduced, and the method is suitable for large-scale popularization and application. The agricultural carbon sink and underground water denitrification efficiency is synchronously improved, and the win-win situation of agricultural production and ecological protection is realized.

The present disclosure provides a distributed permeable reaction wall for groundwater nitrate remediation, relating to the technical field of groundwater remediation. The distributed permeable reaction wall comprises a remediation wall shell, a driving adjusting member and a water supply assembly are installed in the remediation wall shell, a rotating groove is formed in the interior of the remediation wall shell, a plurality of remediation filter members for remediation of groundwater nitrate are connected to the part of the water supply assembly located in the rotating groove, and a plurality of water supply grooves are formed in the side of the remediation wall shell and are connected to the rotating groove. A plurality of remediation filter members are installed on the main water pipe of the entire reaction wall, and each filter member can be directionally adjusted as needed. The technical solution enables the reaction wall to flexibly respond to different groundwater pollution conditions and remediation needs, whether it is unilateral remediation, bilateral remediation or layered remediation, it can be easily realized. The distributed design makes the remediation process more comprehensive and can significantly improve the remediation efficiency of groundwater.

The invention relates to the technical field of adsorption materials, in particular to composite filler and a method for synergistically removing nitrate in underground water based on saw dust and zero-valent iron. Comprising sawdust, nano zero-valent iron, a transforming agent, zero-valent iron, a photocatalyst and a binder, and the transforming agent, the photocatalyst and the zero-valent iron are bonded through the binder; the transforming agent comprises a protein substance, dicyandiamide modified reed biochar and biochar, and the protein substance contains one or more of disulfide bonds and sulfydryl; the photocatalyst is prepared from one or more of a TiO2-based photocatalyst, a Ni-TiO2 bimetallic nano catalyst, g-C3N4, BiVO4, WO3 and boron nitride. The invention aims to provide the preparation method of the composite filler for synergistically removing underground water nitrate based on sawdust and zero-valent iron and the application of the composite filler as an adsorbent to synergistically removing underground water nitrate.

This invention relates to the field of groundwater pollution detection technology, specifically providing an in-situ detection device for nitrate pollution in groundwater. The mounting body has a clamping portion for mounting on one side of the wellhead; the clamping assembly includes a first clamping member driven by a first driving member, which is disposed opposite to the clamping portion and can move under the drive of the first driving member to clamp or release the edge of the wellhead; the deployment assembly includes a winding mechanism and a locking structure driven by the first driving member, the locking structure unlocking or locking the winding mechanism under the drive of the first driving member; the detection unit is connected to the winding mechanism via a flexible member, and when the winding mechanism is unlocked, the flexible member is allowed to release, allowing the detection unit to fall under its own weight. This invention uses a single driving member to simultaneously drive the clamping assembly to complete both wellhead fixing and locking structure unlocking of the winding mechanism, achieving a continuous action between device fixing and detection unit deployment, significantly improving on-site operation efficiency and reducing operational complexity.

The utility model discloses a device for efficiently removing nitrate in underground water, which comprises a tank body, the tank body comprises a tank body upper part and a tank body bottom part, flanges are arranged at the joints of the tank body upper part and the tank body bottom part, a quartz sand cushion layer is arranged in one side of the tank body at the tank body bottom part, and a resin layer is arranged on one side of the tank body above the quartz sand cushion layer; the utility model has the following advantages: the quartz sand cushion layer, the resin layer and the microbial filler layer are additionally arranged in the tank body, and underground water enters the tank body in a bottom-in and top-out manner; nitrate in underground water is degraded into nitrogen through denitrification of the exchange resin layer and the microbial filler layer, the nitrogen is intensively discharged through the nitrogen discharge port, subsequent collection is facilitated, the integration level is high, the occupied space is effectively reduced, and the practicability is high.

The present invention discloses a heterotrophic coupled biautotrophic biological treatment device and method for removing nitrate from groundwater, which relates to the field of water treatment technology. The device comprises a water distribution area, a reaction chamber, and a gas collection area connected in sequence. A heterotrophic nitrate treatment unit is provided at the connection between the reaction chamber and the water distribution area. A hydrogen autotrophic nitrate treatment unit is provided on the side of the heterotrophic nitrate treatment unit away from the water distribution area. Sulfur autotrophic nitrate treatment units are provided at the connection between the reaction chamber and the gas collection area and around the hydrogen autotrophic nitrate treatment unit. A cathode hydrogen-producing electrode is provided at one end of the hydrogen autotrophic nitrate treatment unit near the heterotrophic nitrate treatment unit, and an anode oxygen-producing electrode is provided between the sulfur autotrophic nitrate treatment unit and the gas collection area. The present invention comprehensively utilizes the advantages of the heterotrophic nitrate treatment method, the water electrolysis hydrogen autotrophic nitrate treatment method, the sulfur autotrophic nitrate treatment method, and the electrolytic hydrogen production method to ensure pH self-balance, avoid secondary pollution, and effectively remove nitrate from groundwater.