Near-zero-release treatment system and method for high concentrated organic wastewater

Patent metadata

Field	Value
Publication number	US-10370276-B2
Application number	US-201715604652-A
Country	US
Kind code	B2
Filing date	May 25, 2017
Priority date	May 25, 2017
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A near-zero-release treatment system and method for high concentrated organic wastewater is in the chemical engineering and environment protection field, whose core technology is SCWO. The wastewater and sludge are grinded by the homogeneous pump, pressurized by high-pressure plunger pump, transported to successive pipeline for preheating and mixing with the oxygen and undergoes SCWO reaction in the reactor. After pressure release in the pressure relief device, the reacted fluid passes through the self-cleaning filter and gas liquid separator for insoluble solid and gas separation; then enters the MVR for crystallization of the soluble salts to realize near-zero-release of the feeding. The regular water treatment technology (coagulation sedimentation, membrane biotechnology, membrane technology, etc.) is adopted to complement SCWO, which lowers the operating parameters of the reactor and cuts the operating cost by treating the remaining COD with regular water treatment technology.

First claim

What is claimed is:

1. A near-zero-release process system for high concentrated organic wastewater, comprising: a wastewater transport unit, a reaction unit, an oxygen supplying unit and a reprocessing unit, wherein
the wastewater transport unit comprises a sludge tank ( 1 ) and a sludge buffer tank ( 3 ), wherein a homogeneous emulsification pump ( 2 ) is on a pipe between the sludge tank ( 1 ) and the sludge buffer tank ( 3 ); the reaction unit comprises a heat exchanger ( 5 ) and a tubular reactor ( 6 ); a high-pressure variable-frequency plunger pump ( 4 ) is on a pipe between the sludge buffer tank ( 3 ) and the heat exchanger ( 5 ); an outlet of a pipe side of the heat exchanger ( 5 ) is connected to an inlet of the tubular reactor ( 6 ); an outlet of the tubular reactor ( 6 ) is connected to an inlet of a shell side of the heat exchanger ( 5 ); the oxygen supplying unit is connected to the tubular reactor ( 6 );
the reprocessing unit comprises a pressure relief device ( 7 ), a self-cleaning filter ( 8 ), a gas liquid separator ( 9 ), a MVR (mechanical vapor recompression) crystallization unit ( 10 ) and an advanced treatment unit ( 11 ); wherein an outlet of the shell side of the heat exchanger ( 5 ) is connected to an inlet of the pressure relief device ( 7 ); an outlet of the pressure relief device ( 7 ) is connected to an inlet of the self-cleaning filter ( 8 ); an outlet of a clean fluid of the self-cleaning filter ( 8 ) is connected to the gas liquid separator ( 9 ); an air vent is set on a top of the gas liquid separator ( 9 ); a liquid outlet is set on a bottom of the gas liquid separator ( 9 ); the liquid outlet on the bottom of the gas liquid separator ( 9 ) is connected to an inlet of the MVR crystallization unit ( 10 ); an outlet of the MVR crystallization unit ( 10 ) is connected to an inlet of the advanced treatment unit.

2. The near-zero-release process system for the high concentrated organic wastewater, as recited in claim 1 , wherein the oxygen supplying unit comprises a liquid oxygen tank ( 12 ), a low temperature liquid oxygen pump ( 13 ), a liquid oxygen carburetor ( 14 ), an oxygen buffer tank ( 15 ) and an oxygen adding mixer ( 16 ); wherein an outlet of the liquid oxygen tank ( 12 ) is connected to an inlet of the low temperature liquid oxygen pump ( 13 ); an outlet of the low temperature liquid oxygen pump ( 13 ) is connected to a shell side inlet of the liquid oxygen carburetor ( 14 ); a shell side outlet of the liquid oxygen carburetor ( 14 ) is connected to an inlet of the oxygen buffer tank ( 15 ); an outlet of the oxygen buffer tank ( 15 ) is connected to an inlet of the oxygen adding mixer ( 16 ); the oxygen adding mixer ( 16 ) is connected to a gas inlet of the tubular reactor ( 6 ).

3. The near-zero-release process system for the high concentrated organic wastewater, as recited in claim 1 , wherein the advanced treatment unit ( 11 ) adopts an activated carbon absorption device, an ultrafiltration device or a membrane concentration device.

4. The near-zero-release process system for the high concentrated organic wastewater, as recited in claim 1 , wherein the self-cleaning filter ( 8 ) adopts a rotary scraper type self-cleaning filter.

5. The near-zero-release process system for the high concentrated organic wastewater, as recited in claim 1 , wherein solutes at an entrance of the MVR crystallization unit ( 10 ) are sodium chloride, sodium sulfate or sodium carbonate.

Assignees

• Univ Xi An Jiaotong
• Xian Wonfu Energy And Environment Tech Co Ltd

Inventors

• Wang Shuzhong
• Yang Jianqiao
• Zhang Jie
• Sun Panpan
• Li Yanhui
• Ren Mengmeng

Classifications

• C02F1/02

  by heating (methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D) · CPC title

• C02F1/727

  using pure oxygen or oxygen rich gas · CPC title

• C02F1/444

  by ultrafiltration or microfiltration · CPC title

• C02F2303/26

  Reducing the size of particles, liquid droplets or bubbles, e.g. by crushing, grinding, spraying, creation of microbubbles or nanobubbles · CPC title

• C02F1/004

  using large scale industrial sized filters · CPC title