216results about How to "Improve adsorption removal effect" patented technology

The invention relates to a tea solid phase extraction column and a sample pretreatment method for testing pesticide residues in tea leaves. The tea solid phase extraction column comprises a column pipe and filler in the column pipe, wherein, the filler comprises the following components: 2 to 10 parts of carbon material, 2 to 10 parts of amino-group functionalized adsorbent material and 1 part of polar functional group modified high-polymer materials; the carbon filler is filled in the bottom layer of the column pipe; the amino-group functionalized adsorbent material and the polar functional group modified polymer materials are mixedly filled in the upper layer of the column pipe and a polypropylene sieve plate is provided between the two layers for separation. The invention also discloses a sample pretreatment method for testing pesticide residues in tea leaves. By utilizing the tea solid phase extraction column in sample pretreatment, the pesticide and the metabolite in hundreds of kinds of tea such as black tea, green tea, scented tea, puerh tea can be analyzed and detected, and 653 kinds of pesticide residues can be extracted and purified through sample treatment for once. Therefore, the tea solid phase extraction column and the sample pretreatment method for testing pesticide residues in tea leaves is speedy, economical and is high in universality.

The invention relates to a preparation method of a silicate polymer flocculant rich in active catalyst. The preparation method comprises the following steps: firstly, adding 4-5 parts by weight of sodium silicate to 55-65 parts by weight of water to prepare a sodium silicate solution; secondly, adding the sodium silicate solution to 18-24 parts by weight of 98% sulfuric acid or 37% hydrochloric acid under the stirring condition; adjusting the pH value of the mixed solution to be 3.5-6.5; fully reacting to obtain a polymeric silicic acid solution; then, adding 12-18 parts by weight of inorganic salt and 0.2-0.5 parts by weight of catalyst particles to the polymeric silicic acid solution; stirring to fully react; and finally, standing; and curing to obtain the silicate polymer flocculant rich in active catalyst. The catalyst particles comprise one or several of MnO2, FeOOH and TiO2 in any proportion. The silicate polymer flocculant rich in active catalyst, which is prepared by the method, can improve the processing of hardly coagulated water, such as low-turbidity water, algae-contained water, and the like by the synergy of all components.

The invention relates to the technical field of wastewater purification, in particular to an adsorbent for adsorbing heavy metal ions in wastewater, i.e., waste residues obtained after xylitol is prepared by using corncobs. An adsorption process for heavy metal ions in wastewater comprises the following steps of: placing the adsorbent into wastewater containing heavy metal ions; adsorbing at a certain pH value and temperature for a certain time; and after the adsorption is ended, filtering to obtain filtrate, adjusting the filtrate to be neutral and discharging. The adsorbent for adsorbing heavy metal ions in wastewater has high adsorption capacity and can be directly filtered and removed after the adsorption process is ended, therefore, the cost is low, and the process is simple; and after being used, the adsorbent can be directly filtered and separated from the water, burned or further treated so as to play very important roles in solving the problem of environment pollution and promoting the recycle of wastes.

The invention provides an electrochemical system for treating ship domestic sewage. The electrochemical system comprises a sewage storage box (2), a first-grade electrolytic tank (3), a second-grade electrolytic tank (4), a membrane filtering tank (5), a combustion furnace (12) and an electric control device (1), which are connected in sequence, wherein the electric control device is used for controlling a liquid level control switch (7), power supplies of the first-grade electrolytic tank and the second-grade electrolytic tank, and a slag scraping machine (13) to operate; the second-grade electrolytic tank is internally provided with the slag scraping machine (13) and a precipitation device of an inclined plate or inclined pipe (8); a mud discharging bucket (9) is arranged below the inclined plate or the inclined pipe; flocculated residues collected by the slag scraping machine (13) and the mud discharging bucket (9), and solid particles filtered by a fine grid (6) in the sewage storage box are conveyed to the combustion furnace (12) connected with the slag scraping machine (13) and the mud discharging bucket (9) and the sewage storage box. The electrochemical system provided by the invention can be used for treating COD (Chemical Oxygen Demand), ammonia nitrogen, TN (Total Nitrogen) and TP (Total Phosphorus) in sewage to reach conference standards and has the advantages of high treatment efficiency, simplicity in operation, small occupied area and impact load resistance and the like.

A biochemical process for treating the high-concentration coking sewage with high contents of ammoniacal nitrogen and S includes such steps as mixing it with the water returned from multi-layer mineralized garbage bioreactor bed, laying aside, taking supernatant, treating is said bioreactor bed, and returning part of the treated water for mixing with said coking sewage and the rest back to production line or discharging it.