EFFLUENT TREATMENT PROCESSES

• US 3,627,679 A
• Filed: 05/25/1967
• Issued: 12/14/1971
• Est. Priority Date: 05/25/1967
• Status: Expired due to Term

• Current Assignee: Robert R. Fuller
• Original Assignee: Robert R. Fuller
• Inventors: Fuller, Robert R.
• Primary Examiner(s): Rogers, Michael
• Application Number:
  US04/641,304
• Time in Patent Office: 1,664 Days
• Field of Search: 210/45,47,52 162/29
• US Class Current: 210/711
• CPC Class Codes: B01D 21/00 Separation of suspended solid particles from liquids by sedimentation separation of ores or the like by sedimentation B03B5/48 - B03B5/60 ; differential sedimentation B03D3/00; purification of water, waste water, sewage or sludge C02F, e.g. devices for separating or removing fatty or oily substances or similar floating material from water, waste water or sewage C02F1/40
• CPC Class Codes: B01D 21/0012 Settling tanks making use of filters, e.g. by floating layers of particulate material
• CPC Class Codes: B01D 21/01 using flocculating agents for purifying water C02F1/52; for liquid radioactive waste G21F9/10
• CPC Class Codes: B01D 21/02 Settling tanks with single outlets for the separated liquid
• CPC Class Codes: B01D 21/2427 The feed or discharge opening located at a distant position from the side walls
• CPC Class Codes: B01D 37/00 Processes of filtration processes specially adapted for filtering gases B01D46/00
• CPC Class Codes: C02F 1/52 by flocculation or precipitation of suspended impurities C02F1/463 takes precedence
• CPC Class Codes: C02F 1/5236 using inorganic agents
• CPC Class Codes: Y10S 210/928 Paper mill waste, e.g. white water, black liquor treated

Abstract

A waste effluent treatment which involves contacting a waste effluent, e.g. pulp and paper mill effluent, with a metal salt reagent, preferably alum mud. Treatment decolorizes the effluent and precipitates a substantial portion of the organic content. The precipitate and sludge is dewatered, then calcined, and the reagent regenerated from the ash for use again in a cyclic process.

Claims

2. The process of claim 1, wherein said metal salt is a salt of a metal selected from the group consisting of aluminum, iron and zinc.

3. The process of claim 1, wherein said metal salt and solids reagent is alum mud and the ash is treated with sulfuric acid to reconstitute the alum mud.

4. An effluent treatment procedure which comprises contacting paper and pulp mill waste effluent containing sugars, lignin compounds, cellulose fibers, cooking chemicals and the like, with an aqueous reagent consisting of a mixture of solids and a solution of a metal salt, thereafter clarifying the mixture, separating the effluent and the solids sludge and precipitate, dewatering the separated solids, calcining same to an ash, then treating the ash to reconstitute the metal salt solution and solids reagent, and recycling the reagent for employment on incoming waste effluent.

5. The process of claim 4 wherein said metal salt and solids reagent is an alum mud and the ash is treated with sulfuric acid to reconstitute the alum mud.

6. The process of decolorizing the waste effluent from paper and pulp mills which comprises treating the waste effluent with an aqueous suspension of alum mud, said alum mud further comprising a suspension of finely divided spent ore from which the alum has been extracted and alum in solution, thereafter clarifying the resulting mixture, and separately withdrawing clarified decolorized effluent and solids sludge and precipitate, dewatering the withdrawn solids sludge and precipitate and recycling the recovered water back to the treatment, calcining the dewatered solids to an ash and reacting the ash with sulfuric acid to reconstitute the alum mud for recycle to the treatment.

7. The process of claim 6, wherein the waste effluent is pretreated with sodium aluminate.

8. The Process of claim 6, wherein a sulfate is produced by reaction with sulfuric acid.