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Water treatment process

A unit treatment, water flow technology, applied in mining wastewater treatment, non-polluting water treatment, water/sewage treatment, etc., can solve problems such as consumption of chemicals

Inactive Publication Date: 2018-07-13
AQUATECH INT LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in the need for post-processing and consumes significant amounts of chemicals
Conventional methods also require facilities for chemical handling and storage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] In this trial, tar sands produced water was treated by an enhanced electrocoagulation (EC) method. A small laboratory-scale EC unit consisting of a cylindrical acrylic housing and metal electrodes was used. Six medium carbon steel electrodes measuring 110 mm x 90 mm x 2 mm were used as anodes and six stainless steel (SS 316) electrodes measuring 110 mm x 90 mm x 1 mm were used as cathodes in the EC cell. The anode and cathode electrodes were assembled in an alternating sequence with a 6mm gap between electrodes. A DC power supply is used to apply DC current to the EC unit.

[0093] Different sets of treatments were tested by the EC method on produced water containing very high levels of silica and organic color. The DC current was varied between 1.5 amps and 3.5 amps, and the dwell time in the test was 30 minutes. In the EC method, the formation of two kinds of sludge was observed, the light sludge containing organic impurities floating on the water surface, which wa...

Embodiment 2

[0104] In this experiment, as figure 1 As shown (treatment scheme 1), the produced water from tar sands is treated. The tar sands produced water was first treated by the EC method by means of the EC unit used in Example 1. The operating conditions, treated water quality and impurity removal efficiency of the EC process are summarized in Tables 4 and 5.

[0105] Table 4: Operating conditions of the EC unit

[0106]

[0107]

[0108] Table 5: Quality and removal efficiency of water treated by the EC method

[0109]

[0110] After solids separation, the EC treated water was passed through a sodium zeolite-based hardness removal unit (HRU) to remove residual hardness, after which the residual hardness of the outlet water was reduced to less than 1 ppm. Finally, the treated water is evaporated in an evaporator and 97% of the water (distillate) is recovered. The brine from the evaporator is further concentrated to the crystallization stage. The salt was light brown in co...

Embodiment 3

[0118] In this experiment, following the EC method, tar sands produced water was treated by a membrane-based method ( figure 2 ). The produced water is first treated by the EC method, where most of the impurities are removed. EC treated water contains less than 5 ppm silica, less than 10 NTU turbidity and very low levels of residual hardness. The EC treated water is then passed through a zeolite-based SAC-based HRU unit and a polymeric ultrafiltration membrane to remove residual hardness and turbidity. The outlet water from these units contained less than 1 ppm hardness and less than 0.1 NTU turbidity. The treated water in this step meets all requirements for further treatment by reverse osmosis. Finally, the water can be passed through a RO membrane based on the membrane manufacturer's guidelines, resulting in permeate and greater than 90% recovery for further utilization. The experimental results in each step are summarized in Tables 8 and 9.

[0119] Table 8: Treated ...

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Abstract

A process for enhanced removal of impurities from water by an enhanced multi-step electrocoagulation process including electrocoagulation, solids separation, hardness removal, crystallization, and, optionally, reverse osmosis and evaporative purification. Embodiments of the invention may remove multiple impurities at substantial savings in time, energy, and chemical use. Zero liquid discharge options are also reported.

Description

[0001] related application [0002] This application is a divisional application of a Chinese patent application with the application number 201380069916.6, the application date is November 21, 2013, and the invention title is "water treatment method". [0003] This application claims priority to US Provisional Patent Application No. 61 / 734,606, filed December 7, 2012, and Indian Patent Application No. 2873 / DEL / 2013, filed September 27, 2013. Both applications are incorporated herein by reference. technical field [0004] Embodiments of the invention relate to methods and apparatus for water treatment. Preferred embodiments utilize electrocoagulation in combination with one or more other processing options. Background technique [0005] "Produced water" is water used in the production of oil, gas or other hydrocarbons. Treatment of produced water to remove impurities typically involves various pretreatment methods. Impurity removal is usually performed to enable steam ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10E21B43/24C02F103/10C02F103/04C02F101/20C02F101/10C02F101/30C02F101/32
CPCC02F1/463C02F9/00C02F1/04C02F1/441C02F1/444C02F2101/10C02F2101/105C02F2101/108C02F2101/20C02F2101/308C02F2101/32E21B43/2406C02F2201/4617C02F1/42E21B43/35E21B43/40E21B43/24C02F2103/10
Inventor R·齐达姆巴兰N·S·比施特P·莱纳
Owner AQUATECH INT LLC
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