Method of treating sewage using high polymer ratio flocculation agent biologically produced in situ
阅读：291发布：2023-04-09
专利汇可以提供Method of treating sewage using high polymer ratio flocculation agent biologically produced in situ专利检索，专利查询，专利分析的服务。并且A process for treating sewage in which a high polymer ratio flocculation agent biologically produced in situ is used to flocculate the colloidal suspended solids upstream of the primary clarifier. The flocculation agent is produced by subjecting microorganisms capable of generating polymeric material to a high food content environment in an aeration tank into which supernatant from the primary clarifier is delivered and then subjecting the microorganisms to a low food content environment, as a consequence of which polymeric material is generated through the extracellular activity of the microorganisms.，下面是Method of treating sewage using high polymer ratio flocculation agent biologically produced in situ专利的具体信息内容。
2. The method as defined in claim 1 wherein said raw sewage has an ascertainable BOD content, wherein said supernatant separated from said settled solids has a BOD content less than that of said raw sewage, and wherein said conditions which increase the mass ratio of said polymeric material to said microorganisms to produce said high polymer ratio flocculation agent involve an environment having a BOD content less than that of said supernatant.
3. The method as defined in claim 1, wherein said high polymer ratio flocculation agent comprises about 10-40 percent by dry weight biologically derived polymeric material.
4. The method as defined in claim 2, wherein said conditions which increase the mass ratio of said polymeric material to said microorganisms includes the step of agitating said concentrated low polymer ratio flocculation agent in said low BOD environment.
5. A method of treating sewage comprising the steps of delivering a quantity of raw sewage to a primary clarifier to remove BOD attributable to suspended solids, withdrawing supernatant containing BOD attributable to soluble solids from said primary clarifier and introducing same to an aeration tank, supplying said aeration tank with a mass of microorganisms capable of generating polymeric material, supplying oxygen to said Aeration tank, withdrawing said supernatant and said microorganisms from said aeration tank and subjecting same to flocculation and separation to remove supernatant from said microorganisms, transporting said microorganisms to an environmental zone devoid of additional BOD loading and maintaining same in said environmental zone for a length of time sufficient to biochemically generate by virtue of the extracellular activities of said microorganisms a mass of polymeric material which constitutes at least 10 percent of the total mass of polymeric material and microorganisms on a dry weight basis, and transporting said polymeric material to said raw sewage to mix therewith before said sewage is delivered to said primary clarifier for enhancing flocculation and separation of colloidal suspended solids in said primary clarifier.
6. A method of treating sewage comprising the steps of supplying raw sewage to a primary clarifier, removing supernatant from said primary clarifier to an aeration tank, adding oxygen and a quantity of microorganisms, at least some of which are capable of generating polymeric material to said aeration tank, transporting said supernatant and said microorganisms contained therein through a flocculation and separation stage and separating those microorganisms which generate polymeric material from those which do not, subjecting said polymer generating microorganisms to an environmental condition devoid of readily assimilatable BOD to convert intracellular material of said polymer generating microorganisms to extracellular polymeric material without inactivating all of said polymer generating microorganisms, supplying a portion of said polymer generating microorganisms which are still active to said aeration tank for recycling purposes, and supplying at least a portion of said polymeric material to said raw sewage to mix therewith ahead of said primary clarifier for assisting in and enhancing the removal of settleable solids as well as colloidal suspended solids in said primary clarifier.
7. A method of treating sewage comprising introducing a stream of raw sewage into a clarifier tank, withdrawing supernatant from the clarifier tank and delivering same to an aeration tank, introducing oxygen and microorganisms into said aeration tank, at least a portion of said microorganisms being capable of generating polymeric material, withdrawing the admixture of said supernatant and microorganisms from said aeration tank, separating polymer generating microorganisms from said admixture and subjecting same to a relatively high starvation environment to enhance the generation of polymeric material, recycling at least a portion of said microorganisms back to said aeration tank, and conducting at least a portion of said polymeric material to said stream of raw sewage upstream of said clarifier tank.
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