Polymer Gel Ball For City Wastewater Treatment Research

In recent years, the problem of shortage of water resources have been paid more and more attention, the sewage after advanced treatment and regain the use will greatly alleviate the problem of shortage of water resources. At present, the main method of wastewater treatment with physical method, chemical method and biological method, but these methods have some limitation cannot scale using. And the immobilized technology because of simple process, high treatment efficiency, easy regeneration, has the advantages of high speed, in the sewage treatment is widely used.This paper adopts the immobilization technique, preparation of polymer gel ball as an adsorbent, the city sewage, mainly in the sewage treatment of COD and inorganic phosphate. At the same time, polymer gel ball of COD and inorganic phosphate adsorption mechanism were studied, and the sewage treatment plant effluent by two the depth of processing, for the future of polymer adsorption materials and advanced wastewater treatment research to make power.Alginate calcium gel ball (SA-Ca) COD and inorganic phosphorus adsorption experiments found:alginate gel ball (SA-Ca) to COD (100mg/L) and inorganic phosphate (3mg/L) adsorption ability are weaker, the removal rate of COD is about10%and the inorganic phosphorus can remove.Sodium alginate-Fe gel ball (SA-Fe) COD and inorganic phosphorus adsorption experiments found that:COD (100mg/L) optimal adsorption amount is10mL, oscillation time120min, the removal rates for42%. The mechanism of adsorption of sodium alginate and ferric chloride as cross-linking can be formed when a lot of hydroxyl ion complexes, by adhesion and cross effects of adsorption of organic compounds in water. On inorganic phosphorus (3mg/L) adsorption to the optimal parameter is10mL, the adsorption time was93%120min, removal rate. The mechanism of adsorption for inorganic phosphorus removal rate and gel grid in the Fe3+content, Fe3+and PO43-chemical reaction, reaction FePO4, attached to the gel ball network removed. When SA-Fe gel ball containing Fe3+reaches a certain level, removal rate will not change.Entrapped activated carbon powder sodium alginate-Fe Ning ball (SA-Fe-AC) COD and inorganic phosphorus adsorption experiments found that:COD (100mg/L) adsorption, the entrapped powdered activated carbon dosage is15mg, oscillation time90min, the removal rates for75%, on inorganic phosphorus (3mg/L). The removal rate of92%.Sodium alginate-Fe gel ball (SA-Fe) and entrapped activated carbon powder sodium alginate-Fe gel ball (SA-Fe-AC) and COD adsorption experiments found that:Freudlich type and Langmuir type equation can describe the SA-Fe gel ball and SA-Fe-AC gel ball of COD adsorption behavior. By fitting the data we can see the results of SA-Fe and SA-Fe-AC on COD adsorption behavior are more consistent with a type Langmuir. This shows that the adsorption behavior of approximation for the single molecular layer adsorption, with typical chemical adsorption characteristics. The saturated adsorption amount of Q0=416.7mg/g and Q0=907mg/g.Sodium alginate-Fe gel ball (SA-Fe) and entrapped activated carbon powder sodium alginate-Fe gel ball (SA-Fe-AC) on COD and inorganic phosphate mixed solution of inorganic phosphate and COD have some adsorption capacity, and when the time of120min, SA-Fe and SA-Fe-AC on the mixed solution of two removal rate of basic no longer change, then sodium alginate-Fe gel ball (SA-Fe) on COD and inorganic phosphorus removal rates were41%and84%, SA-Fe-AC to COD and inorganic phosphorus removal rates were71%and87%.Sodium alginate-Fe gel ball (SA-Fe) and entrapped activated carbon powder sodium alginate-Fe gel ball (SA-Fe-AC) on two sewage treatment plant effluent by inorganic phosphate and COD has certain adsorption capacity, and when the time of120min, SA-Fe and SA-Fe-AC on the mixed solution of two removal rates remain unchanged, when the SA-Fe on COD and inorganic phosphorus removal rates were35%and80%, and SA-Fe-AC COD and inorganic phosphorus removal rates were64%and82%.