3 results about "Groundwater nitrate" patented technology

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.