Method for the treatment of wastewater

• US 9,255,025 B2
• Filed: 07/22/2013
• Issued: 02/09/2016
• Est. Priority Date: 07/20/2012
• Status: Active Grant

• Current Assignee: Evoqua Water Technologies LLC (Xylem, Inc.)
• Original Assignee: ProAct Services Corporation (Xylem, Inc.)
• Inventors: Smiddy, Gerard Willem, Smiddy, Frank Leslie
• Primary Examiner(s): Savage, Matthew O
• Application Number:
  US13/947,883
• Publication Number:
  US 20140021137A1
• Time in Patent Office: 932 Days
• Field of Search: 210/241, 210/266, 210/663, 210/669, 210/793
• US Class Current: 1/1
• CPC Class Codes: C02F 1/004 using large scale industrial sized filters
• CPC Class Codes: C02F 1/281 using inorganic sorbents
• CPC Class Codes: C02F 1/283 using coal, charred products, or inorganic mixtures containing them
• CPC Class Codes: C02F 1/288 using composite sorbents, e.g. coated, impregnated, multi-layered
• CPC Class Codes: C02F 1/38 by centrifugal separation
• CPC Class Codes: C02F 1/52 by flocculation or precipitation of suspended impurities C02F1/463 takes precedence
• CPC Class Codes: C02F 1/74 with air aeration of stretches of water C02F7/00
• CPC Class Codes: C02F 2001/007 Processes including a sedimentation step
• CPC Class Codes: C02F 2101/203 Iron or iron compound
• CPC Class Codes: C02F 2101/32 Hydrocarbons, e.g. oil
• CPC Class Codes: C02F 2103/10 from quarries or from mining activities
• CPC Class Codes: C02F 2201/008 Mobile apparatus and plants, e.g. mounted on a vehicle
• CPC Class Codes: C02F 2209/00 Controlling or monitoring parameters in water treatment
• CPC Class Codes: C02F 2209/40 Liquid flow rate
• CPC Class Codes: C02F 2303/16 Regeneration of sorbents, filters
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage
• CPC Class Codes: C02F 9/20 Portable or detachable small-scale multistage treatment devices, e.g. point of use or laboratory water purification systems

Abstract

A system and method for the treatment of wastewater. In one aspect, the invention can be a method for treating wastewater comprising: a) introducing untreated wastewater into a holding tank; b) flowing the untreated wastewater into a first wastewater treatment trailer to provide a first treatment regimen to the untreated wastewater to form a first treated wastewater; c) flowing the first treated wastewater into a second wastewater treatment trailer to provide a second treatment regimen to the first treated wastewater to form a second treated wastewater; and wherein the holding tank, the first wastewater treatment trailer and the second wastewater treatment trailer are fluidly coupled together to facilitate flow of the untreated wastewater from the holding tank into the first wastewater treatment trailer and flow of the first treated wastewater from the first wastewater treatment trailer into the second wastewater treatment trailer.

Claims

1. A method for treating wastewater comprising:

a) introducing untreated wastewater into a holding tank;

b) flowing the untreated wastewater into a first wastewater treatment trailer to provide a first treatment regimen to the untreated wastewater to form a first treated wastewater;

c) flowing the first treated wastewater into a second wastewater treatment trailer to provide a second treatment regimen to the first treated wastewater to form a second treated wastewater;

wherein the holding tank, the first wastewater treatment trailer and the second wastewater treatment trailer are fluidly coupled together to facilitate flow of the untreated wastewater from the holding tank into the first wastewater treatment trailer and flow of the first treated wastewater from the first wastewater treatment trailer into the second wastewater treatment trailer;

wherein step b) further comprises;

b-1) flowing the untreated wastewater through one or more sand filters to remove solids suspended in the untreated wastewater and to adsorb iron from the untreated wastewater;

b-2) flowing the untreated wastewater through a clay tank to remove inorganic contaminants from the untreated wastewater and to adsorb oil, grease and other longer chain hydrocarbons from the untreated wastewater to form the first treated wastewater;

b-3) backwashing at least one of the one or more sand filters to form backwashed water;

b-4) flowing the backwashed water from the at least one of the one or more sand filters to at least one hydrocyclone to separate the backwashed water into solid material and liquid;

b-5) flowing the solid material from the at least one hydrocyclone and into a slop tank for temporary storage of the solid material;

b-6) flowing the liquid from the at least one hydrocyclone and into a settling tank; and

b-7) flowing the liquid from the settling tank and into the holding tank.

2. The method of claim 1 further comprising injecting a clarifying agent into the backwashed water to induce flocculation of particles suspended in the backwashed water after step b-3) and before step b-4).

3. The method of claim 1 further comprising automatically injecting chlorine into the at least one of the one or more sand filters during step b-3).

4. The method of claim 3 wherein the automatic injection of chlorine occurs contemporaneously with step b-3).

5. The method of claim 1 wherein step c) further comprises:

c-1) flowing the first treated wastewater through at least one carbon tank;

c-2) flowing the first treated wastewater through at least one bag filter to form the second treated wastewater; and

c-3) discharging the second treated wastewater from the second wastewater treatment trailer to a discharge location.

6. The method of claim 5 wherein the at least one carbon tank comprises a first carbon tank and a second carbon tank;

and wherein step c-1) comprises;

c-1a) flowing the first treated wastewater as an influent through the first carbon tank and then flowing the first treated wastewater as an effluent through the second carbon tank;

c-1b) monitoring a contamination level of the influent and of the effluent; and

c-1c) changing a flow path of the first treated wastewater so that the first treated wastewater flows through the second carbon tank and then through the first carbon tank when the contamination level of the effluent is above a pre-determined threshold; and

wherein the pre-determined threshold is met when a ratio of the contamination level of the influent to the contamination level of the effluent is 5;

1 or less.