2 results about "Tetraacetylethylenediamine" patented technology

This invention relates to the field of comprehensive utilization of biomass resources, and discloses a pretreatment process for the efficient resource utilization of crop straw, comprising: mixing and impregnating crushed straw particles with a high-concentration solubility buffer; adding solid tetraacetylethylenediamine and flowing hydrogen peroxide solution for oxidation reaction; performing hot solid-liquid separation under no-cooling conditions, washing the filter cake to obtain cellulose enrichment, and combining the washing liquid with primary hot black liquor to obtain mixed black liquor; cooling the mixed black liquor to induce a phase change, separating lignin and cold mother liquor, discharging part of the cold mother liquor, and recycling the remaining mother liquor. This invention improves the separation efficiency of straw components by constructing a stable pretreatment reaction microenvironment through composition; prevents secondary lignin adhesion and achieves lignin precipitation by controlling the hot separation and cold phase change operations; and reduces the overall water and reagent consumption of the process by combining the mother liquor circulation design.

This application relates to the field of sludge treatment technology, and discloses a sludge dewatering agent and a sludge dewatering method. The dewatering agent consists of reagent A (sodium percarbonate and tetraacetylethylenediamine powder), reagent B (magnesium sulfate solution), reagent C (polyferric sulfate solution), and reagent D (cationic polyacrylamide solution), which are packaged independently. The dewatering method involves adding the above reagents in sequence: first, reagent A is used to oxidize and break down the extracellular polymers of the sludge, releasing endogenous phosphorus and nitrogen and providing a slightly alkaline environment; then, reagent B is added, causing it to crystallize in situ with phosphorus and nitrogen in the liquid phase to form a rigid magnesium ammonium phosphate framework, improving the sludge permeability; next, reagent C is added to neutralize the alkalinity of the system and trap residual microcrystals and free phosphorus; finally, reagent D promotes floc formation, followed by filter press dewatering. This invention reduces the amount of external dewatering additives and the moisture content of the sludge cake, realizes the conversion and utilization of endogenous phosphorus and nitrogen in the sludge, and avoids secondary pollution caused by phosphorus enrichment in the effluent.