Patent KR-101301598-B1 (KR)
Title: Coagulant input rate real time optimal method and polluted sewage treatment facilities therefor
Inventor: YOON DAE YOUNG
IPC: C02F1/52
Filed: 2013-04-30
Granted: 2013-08-29
Abstract: PURPOSE: An optimal method of coagulant input rate in real time is provided to minimize coagulant usage because the coagulant input rate is determined based on the phosphorus removal performance of a coagulant having a specific phosphorus removal amount per 1 ppm in waste water. CONSTITUTION: An optimal method of coagulant input rate in real time comprises the steps of: (a) setting the target phosphorus concentration (ET) of discharged water; (b) producing a first sample by filling waste water in a filtration bath; (c) filtering suspended solids of the first sample in the filtrate bath and filling the waste water in a jar bath to produce a second sample; (d) measuring the waste water phosphorus concentration (P3) of the first sample having no suspended solids; (e) emptying the filtration bath; (f) inserting a coagulant with determined coagulant input quantity (JDQO) into the jar bath to mix with the coagulant having the second sample and stir the mixture; (g) dropping the second sample having the coagulant in the jar bath on the filtration bath; (h) measuring the coagulant sample phosphorus concentration (JP) after filtering suspended solids in the second sample with the coagulant in the filtration bath; (i) repeating from the (b) step to (h) step after emptying the filtration bath and the jar bath; (j) calculating the coagulant real efficiency (CD) in comparison with the coagulant input rate (JDR) by finding the difference between the coagulant sample phosphorus concentration (JP) and the waste water phosphorus concentration (P3); (k) calculating the practical coagulant input rate (CIR) necessary for the target phosphorus concentration (ET) based on the coagulant real efficiency (CD); and (l) injecting the coagulant according to the inflow of the waste water, from which phosphorus concentration has to be removed, based on the above-mentioned practical coagulant input rate (CIR). [Reference numerals] (AA) End; (S10) MPCS operating; (S100,S300) Implementing measurement of phosphorus concentration; (S110,S310) Injecting sample of a filter water tank; (S120,S320) Filtering sample; (S130,S330) Measuring phosphorus concentration (P3) of the sample; (S140,S340,S700) Back-washing and drainage; (S150,350) Changing into waiting mode; (S20) Setting discharge target of phosphorus concentration (ET); (S200) Implementing test mode of phosphorus concentration; (S210) Injecting sample of a jar bath; (S220) Calculating the used amount of coagulant (JDR) (JDR=(PT-ET)/CD); (S230) Calculating the used amount of coagulant (JDQO) (JDQO=(JDR×JSQ)/10,000); (S240) Adding coagulant and stirring; (S30) Measuring coagulant performance?; (S40,S50) Running sampling pump; (S400) Discharging the produced coagulant sample?; (S410) Changing into an inflow mode of coagulant sample; (S420) Connecting the jar bath and the filter water tank; (S430) Inflowing coagulant sample of the filter water tank and filtering; (S440) Measuring phosphorus concentration (P3) of the coagulant sample; (S450) Measuring phosphorus removal amount of the coagulant (JCD=(P3-JP)/JDR); (S460) Deciding real removal efficiency of phosphorus of the coagulant (CD=JCD); (S470) Measuring the amount of injected coagulant (CIR, Cpagulant Input Rate)(CIR=(ET)/CD); (S480) Measuring the amount of injected coagulant (CIQ, Coagulant Input Quantity)(CIQ=(swage inflow amount×cir/60); (S490) Measuring the injection speed of coagulant (CIS, Coagulant Input Speed)(CIS= CIQ/ coagulant specific gravity); (S500) Offering data to MPCS; (S600) Satisfying test period and repeating?