7results about How to "Reduce nitrate levels" patented technology

The invention relates to preparation and application of a hydroponic nutrient solution, in particular to application of the hydroponic nutrient solution in cultivation of Chinese chives. In combination with different requirements of leek on nutrients in different growth stages such as a germination accelerating and sowing stage, a seedling stage, a field planting stage and a harvesting stage, nutrients are supplied to leek in a targeted manner, and the problem that an existing hydroponic nutrient solution does not configure and supply nutrient elements according to different nutrient requirements of crops in different growth stages is effectively solved. While the yield of the hydroponic Chinese chives is increased, the content of nitrate in the Chinese chives can be effectively reduced, the content of Vc, soluble sugar and soluble solids is increased, and no Chinese chive maggots occur after multiple crops of continuous planting.

The invention provides an earthworm amino acid water-soluble fertilizer as well as a preparation method and application thereof. The earthworm amino acid water-soluble fertilizer is prepared from the following materials in parts by weight: 70 to 100 parts of ferrous sulfate, 8 to 14 parts of boric acid, 10 to 18 parts of potassium molybdate, 3 to 7 parts of monopotassium phosphate, 3 to 7 parts of manganese sulfate, 2 to 7 parts of zinc sulfate, 3 to 7 parts of copper sulfate, 2 to 5 parts of potassium chloride and 900 to 1100 parts of earthworm fermentation liquor. The nitrogen fertilizer in the amino acid water-soluble fertilizer exists in the form of amino acid molecules, can be easily absorbed and utilized by crops, can significantly reduce the conversion of the nitrogen fertilizer to an inorganic nitrogen form (such as nitrate), and effectively reduces the nitrate content of leaf vegetables. Besides, the proportion of phosphorus and potassium in the amino acid water-soluble fertilizer is determined according to the nutrient requirements of the leaf vegetables, and meanwhile, more comprehensive trace elements are added, so that the growth of the leaf vegetables can be promoted, and the taste of the leaf vegetables is improved.

This invention discloses *Aphelenchus brittleus* and its applications, relating to the field of microbial technology. The strain is taxonomically named *Aphelenchus brittleus* (…). Acaulospora delicata The specimen, with accession number CGMCC NO.42100, is a *C. cristatum* NM26B that can improve the yield and quality of chives, enhance mineral nutrient absorption, and increase the expression of genes synthesizing chive-specific aroma compounds. This lays the foundation for future research and development of suitable microbial agents for the development of the chive industry.

This invention discloses a method for removing nitrates from wastewater generated during drill-and-blast tunnel construction, comprising the following steps: 1. Preparation of electrospun nanofibers: First, DMF is added to a container, and submicron-sized iron powder and submicron-sized calcium-based montmorillonite are added sequentially to the DMF solution and ultrasonically dispersed. Then, the mixture is stirred to ensure uniform dispersion of the iron powder and calcium-based montmorillonite. PAN powder is weighed and added to the above solution, and stirred until the PAN is completely dissolved into a viscous liquid. The resulting solution is then placed in an electrospinning machine for electrospinning to prepare PAN nanofibers. 2. Removal of nitrates from the drill-and-blast tunnel construction wastewater: The prepared PAN nanofibers are completely immersed in the drill-and-blast tunnel construction wastewater. After immersion for a period of time, the PAN nanofibers are removed. This invention can efficiently and cost-effectively remove nitrates present in wastewater generated during drill-and-blast tunnel construction.

The invention belongs to the field of soil pollution treatment, and relates to a method for jointly relieving toxicity of microplastics to a soil-plant system based on a nitrification inhibitor-carbon nanomaterial. The method comprises the following steps: applying a nitrification inhibitor and a carbon nanomaterial to plant planting soil; the nitrification inhibitor is DMPP, and the carbon nanomaterial is one or more of a multi-walled carbon nanotube and a nanodiamond. The method can technically slow down microplastic pollution, improve soil health and guarantee quality safety of agricultural products.

The invention discloses a method for removing nitrate in drilling and blasting method tunnel construction wastewater, which comprises the following steps: 1, preparing electrostatic spinning nanofibers: firstly, adding DMF (Dimethyl Formamide) into a container, sequentially adding submicron iron powder and submicron calcium-based montmorillonite into a DMF solution, and carrying out ultrasonic dispersion to obtain the electrostatic spinning nanofibers; then stirring to uniformly disperse the iron powder and the calcium-based montmorillonite; weighing PAN powder, adding the PAN powder into the solution, and stirring until the PAN powder is completely dissolved into viscous liquid; then putting the obtained solution into an electrostatic spinning machine for electrostatic spinning to prepare PAN nanofibers; 2, nitrate in drilling and blasting method tunnel construction wastewater is removed, specifically, the prepared PAN nanofiber is completely soaked in the drilling and blasting method tunnel construction wastewater for a period of time, and then the PAN nanofiber is taken out. According to the method, nitrate in the drilling and blasting method tunnel construction wastewater can be efficiently removed at low cost.

The present invention discloses a method for repairing the bottom mud of tail water containing nitrate from a sewage treatment plant and a tail water delivery device, comprising a water delivery pipeline, a box and a water distribution plate, wherein the water inlet end of the water delivery pipeline is connected to the tail water delivery facility of the sewage treatment plant, and the water discharge end of the water delivery pipeline is connected to the box; the box is fitted on the bottom mud at the bottom of the water body, and the water distribution plate fitted on the surface of the bottom mud is fixed at the drainage end of the box, and a deceleration chamber with multiple levels of communication and increasing volume is provided in the box along the flow direction of the fluid; the water inlet end of the deceleration chamber is provided with a deceleration zone, and the drainage end of the deceleration chamber is provided with an arc-shaped deceleration baffle, and the deceleration baffles in two adjacent deceleration chambers are staggered. The design method of the delivery device can deliver the tail water of the sewage treatment plant to the bottom of the water body, so that the nitrate in the tail water directly acts on the polluted bottom mud, and the delivery device has the function of energy dissipation and deceleration, and can use the tail water of the sewage treatment plant as a long-term water replenishment source for the water body, improve the flow rate and self-purification capacity of the water body, and improve the hydrodynamics and habitat conditions.