Method of washing laundry and recycling wash water

• US 5,787,537 A
• Filed: 07/19/1996
• Issued: 08/04/1998
• Est. Priority Date: 07/19/1996
• Status: Expired due to Fees

• Current Assignee: United Recovery Systems Incorporated
• Original Assignee: United Recovery Systems Incorporated
• Inventors: Mannillo, Richard W.
• Primary Examiner(s): Coe, Philip R.
• Application Number:
  US08/684,031
• Time in Patent Office: 746 Days
• Field of Search: 8/158, 68/18 R, 210/639, 210/640, 210/748, 210/760, 210/765
• US Class Current: 8/158
• CPC Class Codes: C02F 1/283 using coal, charred products, or inorganic mixtures containing them
• CPC Class Codes: C02F 1/32 with ultraviolet light
• CPC Class Codes: C02F 1/441 by reverse osmosis
• CPC Class Codes: C02F 1/78 with ozone C02F1/4672 takes precedence
• CPC Class Codes: C02F 2103/30 from the textile industry
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage
• CPC Class Codes: D06F 39/20 Arrangements for water recovery

Abstract

An environmentally safe laundry washing apparatus and method includes a primary solids removal system with an inlet for receiving waste wash water which delivers the water to a separation system and then to a main circulation system which has an ozone source and at least one filter. A final water purification batch treatment system capable of greater than 98% total dissolved solids removal in conjunction with a sterilization device is in fluid communication with the main circulation system, and a washing means is located downstream from the final water purification system. The wash water is recirculated from the washing means after the completion of a wash cycle to an inlet of the primary solids removal system.

Claims

1. A method of washing laundry comprising the steps of:

a.) collecting a supply of wash water;

b.) mixing ozone into said wash water supply;

c.) treating said wash water supply with a sterilization device;

d.) filtering said wash water supply with a reverse osmosis unit;

e.) delivering said wash water supply to a washing means;

f.) washing said laundry in said washing means;

g.) recirculating said wash water supply after completion of a wash cycle, back to step a.

2. A method of washing laundry comprising the steps of:

a.) introducing a supply of wash water to a primary solids removal system for removal of primary solids;

b.) delivering said wash water supply to a separation system to remove suspended solids;

c.) mixing ozone into said wash water supply;

d.) treating said wash water supply with a sterilization device;

e.) filtering said wash water supply with a reverse osmosis unit;

f.) delivering said wash water supply to a washing means;

g.) washing said laundry in said washing means;

h.) recirculating said wash water supply after completion of a wash cycle to said primary solids removal system.

3. A method of washing laundry comprising the steps of:

a.) introducing a supply of wash water to a primary solids removal system for removal of primary solids;

b.) delivering said wash water supply to a separation system to remove suspended solids;

c.) mixing ozone into said wash water supply;

d.) delivering said wash water supply to at least one filter means;

e.) treating said wash water supply a sterilization device;

f) filtering said wash water supply with a reverse osmosis unit;

g.) delivering said wash water supply to a washing means;

h.) washing said laundry in said washing means; and

i.) recirculating said water supply after completion of a wash cycle to said primary solids removal system.

4. The method of claim 3 wherein the at least one filter means of step d) comprises:

a first filter means having carbon columns for removing trace surfactants and organics;

a second filter means having leaf filter from removing surfactants and organics, said second filter means in fluid communication with said first filter means; and

a third filter means having at least one sand filter, said third filter means being in fluid communication with said second filter means.

5. The method of claim 4 wherein the at least one filter means further comprises a fourth filter means in fluid communication with said third filter means, said fourth filter means having a plurality of bag filters connected in series.

6. A method of washing laundry by recirculating waste wash water produced after completion of a wash cycle, after introducing an initial supply of wash water, said method including the steps of:

a) introducing a supply of waste wash water to be treated to an associated primary solids removal system for the removal of primary solids from said waste wash water,

b) delivering water treated by said primary solids removal system to an associated dissolved air flotation separation system and dissolving air into said water being treated, and separating out undesired substances including suspended solids,

c) delivering said water treated by said air flotation separation system to an associated main circulation system, and in said main circulation system mixing and dissolving ozone into said water being treated,

d) delivering said water being treated, after mixing and dissolving said ozone to at least one supplemental filter means,

e) passing said water through said supplemental filter means to an associated final water purification system;

f) delivering said water being treated to a washing means;

g) washing said laundry in said washing means;

h) recirculating said wash water after completion of a wash cycle to said primary solids removal system.

7. The method of claim 6 wherein the main circulation system comprises:

a main process tank for receiving said water treated by said dissolved air flotation separation system, said main process tank being in fluid communication with an ozone source and with said supplemental filter means.

8. The method of claim 7 wherein the supplemental filter means comprises:

a first filter means having carbon columns for removing surfactants and organics, said first filter means being in fluid communication with said main process tank;

a second filter means having a leaf filter for removing surfactants and organics, said second filter means being in fluid communication with said main process tank; and

a third filter means in fluid communication with said main process tank and having at least one sand filter for removing surfactants and organics.

9. The method of claim 8 wherein the supplemental filter means further comprises a fourth filter means in fluid communication with said third filter means, said fourth filter means having a plurality of series connected bag filters.

10. The method of claim 6 wherein said final water purification system comprises,

a sterilization device in communication with said main circulation system;

and

a reverse osmosis system in fluid communication with said sterilization device and with said washing means.

11. The method of claim 10 wherein said final water purification system further comprises an evaporator unit in fluid communication with said reverse osmosis system.

12. The method of claim 6 including the further step of:

mixing polymers into said water being treated in said dissolved air flotation separation system to coagulate undesired substances into suspended solids, and skimming off said suspended solids from said water being treated.