4results about How to "Low Sulfate Content" patented technology

The utility model discloses a kind of high-concentration hemicellulose wastewater treatment systems, it is related to high-concentration hemicellulose wastewater treatment technical field, including the adjusting pool, fenton reaction pool, fenton sedimentation tank, multistage hydrolysis acidification pool and lifting pool connected in order, the adjusting pool water inlet is connected with high-concentration hemicellulose wastewater pipeline, non-ferrous wastewater pipeline and acidic wastewater pipeline, adjusting pool and fenton reaction pool between being provided with dispensing room, and ferrous sulfate storage tank, hydrogen peroxide storage tank and PAM storage tank are provided in dispensing room, ferrous sulfate storage tank and hydrogen peroxide storage tank are connected with fenton reaction pool water inlet respectively, and PAM storage tank is connected with fenton reaction pool, fenton reaction pool is also connected with alkali tank, the fenton sedimentation tank bottom is provided with sludge pump, and the lifting pool water outlet is connected with polymeric ferric sulfate storage tank. Through pre-fenton system combination multistage anaerobic treatment unit realizes the efficient decomposition of hemicellulose, lignin and other refractory substances, and cooperates subsequent advanced treatment to ensure that effluent COD is stable and up to standard.

The utility model discloses a deep denitrification device for wastewater in an electronic industrial park, which comprises a reactor, a filler area is arranged in the reactor, and the filler area is formed by sequentially and alternately arranging sulfur filler layers and zero-valent iron filler layers; a bearing area is arranged below the filling area; a cylindrical graphite anode penetrating through the filler area is also arranged in the reactor; the stainless steel side wall of the reactor serves as a cathode, and the cathode and the anode are connected with an external power source through wires respectively. According to the deep denitrification device disclosed by the utility model, denitrification is carried out in a sulfur-iron-hydrogen autotrophic denitrification synergistic manner, so that the problems that the effluent is slightly acidic and slightly alkaline and the content of sulfate radicals in the effluent is high can be solved, and the denitrification reaction rate of microbial strains can be effectively improved.

The invention provides a high-yield propylene catalytic cracking catalyst and a preparation method and application thereof.The preparation method comprises the steps that ammonium sulfate is adopted as an exchanger, a precipitator is added after rare earth ion exchange and before ammonium sulfate exchange, the precipitator and rare earth ions preferentially generate a precipitation precursor of rare earth oxide, and then the precipitation precursor of the rare earth oxide is obtained; therefore, the rare earth modified Y-type molecular sieve with low sulfate radical content, high crystallinity and good stability is prepared. Fully and uniformly mixing water, the rare earth modified Y-type molecular sieve, the ZSM-5 molecular sieve, clay and a binder, and then carrying out homogenizing, spray drying and third roasting to prepare a Na-containing catalyst; the preparation method comprises the following steps: mixing and pulping water and Na-containing catalyst particles, adding a phosphorus-containing substance to carry out sodium reduction modification on a Na-containing catalyst, filtering, washing with water, and drying to obtain a finished product of the catalyst. The finished product catalyst uses the rare earth modified Y-type molecular sieve with the characteristics as an active component, so that the finished product catalyst has the advantages of high propylene yield, strong heavy oil conversion capability, high liquid yield and the like.

The utility model relates to the technical field of phosphorite decomposition, and particularly provides an ammonium sulfate acidifying and circularly decomposing phosphorite device which comprises a pre-decomposition reaction tank, an acidolysis reaction tank, a first filter, a desulfurization reaction tank, a second filter, an acidolysis dephosphorization reaction tank and a third filter which are sequentially connected through pipelines and pumps, wherein the pre-decomposition reaction tank is provided with a phosphoric acid feeding port, the acidolysis reaction tank is provided with an acidified ammonium sulfate feeding port, filter residues of the first filter are conveyed to the acidolysis reaction tank through a conveying belt, the desulfurization reaction tank is provided with a phosphorite feeding port, and filter residues of the second filter are conveyed to the pre-decomposition reaction tank through a conveying belt. Filter residues of the third filter are conveyed out of the ardealite through a conveying belt. Phosphorite is decomposed through acidified ammonium sulfate, a crude ammonium phosphate solution and ardealite can be obtained, impurities of a product are continuously removed through raw materials subsequently, the content of sulfate radicals in the ammonium phosphate solution can be reduced, and agricultural monoammonium can be directly produced on the downstream. The content of phosphorus pentoxide in the phosphogypsum can also be reduced.