Domestic sewage treatment system

Patent metadata

Field	Value
Publication number	US-12172918-B2
Application number	US-202017627461-A
Country	US
Kind code	B2
Filing date	Aug 19, 2020
Priority date	Aug 20, 2019
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

A treatment system for domestic wastewater, relating to the technical field of wastewater treatment. The treatment system comprises a primary treatment system, a secondary treatment system, and a sludge treatment system; the secondary treatment system comprises a biochemical tank ( 21 ) and a sedimentation tank ( 22 ) that are sequentially connected; the biochemical tank ( 21 ) is connected to the primary treatment system; the secondary treatment system further comprises a second cylcone separator ( 23 ) and a power pump ( 24 ); one end of the power pump ( 24 ) is connected to a sludge outlet of the sedimentation tank ( 22 ) by means of a pipeline, and the other end of the power pump ( 24 ) is connected to a second feed pipe ( 232 ) of the second cylcone separator ( 23 ); a second underflow port ( 233 ) is connected to the biochemical tank ( 21 ) by means of the pipeline; a second overflow port ( 234 ) is connected to the sludge treatment system by means of the pipeline. After active sludge is treated by the second cylcone separator ( 23 ), the activity of the active sludge is increased by at least 15%, thereby improving the utilization rate of a resource, reducing the cost of an overall treatment system, also improving degradation efficiency in the biochemical tank, and facilitating popularization.

First claim

The invention claimed is:

1. A domestic sewage treatment system, comprising a primary treatment system, a secondary treatment system, and a sludge treatment system, wherein:
the primary treatment system comprises a coarse screen assembly, a fine screen assembly connected in sequence, the secondary treatment system comprises a biochemical tank, a clarifier connected in sequence, and the biochemical tank is connected to the primary treatment system, and wherein the primary treatment system further comprises a first hydrocyclone intensified filtration, a collector, a shape coalescer, an oil storage tank, the fine screen assembly is connected to the first hydrocyclone intensified filtration, the first hydrocyclone intensified filtration is connected to the shape coalescer, the collector, and the oil storage tank is connected to the shape coalescer;
the secondary treatment system further comprises a second cyclone separator, a power pump, the second cyclone separator comprises a second body, a second feed pipe arranged at one side thereof, a second underflow port is arranged at one side of the second body, a second overflow port is arranged at the other side thereof, one end of the power pump is connected to a sludge outlet of the clarifier through a pipe, the other end thereof is connected to the second feed pipe of the second cyclone separator, the second underflow port is connected to the biochemical tank through a pipe, and the second overflow port is connected to the sludge treatment system through a pipe;
the domestic sewage treatment system further comprises an advanced treatment system, which is connected to the secondary treatment system and the sludge treatment system, the advanced treatment system comprises a second hydrocyclone intensified filtration with a same structure as the first hydrocyclone intensified filtration, a nanofiltration device, and both the clarifier and the nanofiltration device are connected to the second hydrocyclone intensified filtration;
the sludge treatment system comprises a sludge storage tank, a belt dehydrator, a hot gas generating device, a gas-liquid separator, two first cyclone separators connected in series, the sludge storage tank is connected to the secondary treatment system, and the belt dehydrator, one of the two first cyclone separators comprises a first body, a first feed pipe vertically arranged at one side of the first body, a first underflow port is arranged at the bottom of the first body, a first overflow port is arranged at the top thereof, both the hot gas generating device, and the belt dehydrator are connected to the first feed pipe of the one of the two first cyclone separators arranged first in line along a sludge flow direction, and the first overflow ports and a first overflow port of the other of the two first cyclone separators are connected to the gas-liquid separator; and
the sludge treatment system further comprises a separation column, the first underflow port of the one of the two first cyclone separators arranged first in line along the sludge flow direction is connected to the feed port of the separation column, and the discharge port of the separation column is connected to the first feed pipe of the other of the two first cyclone separators.

2. The domestic sewage treatment system according to claim 1 , wherein: the first hydrocyclone intensified filtration comprises a shell, a first water inlet, a first water outlet, a separation medium bed, a discharge distributor, the first water inlet is arranged at the top of the shell, the first water outlet is arranged at the bottom thereof, the separation medium bed and the discharge distributor are arranged therein, and the separation medium bed is arranged on the discharge distributor.

3. The domestic sewage treatment system according to claim 2 , wherein: a first valve is arranged at the first water inlet, a second valve is arranged at the first water outlet, the first hydrocyclone intensified filtration further comprises a gas inlet, a cleaning water inlet and a cyclone three-phase separator, both the gas inlet and the cleaning water inlet are arranged at the bottom of the shell, a third valve is arranged at the gas inlet, a fourth valve is arranged at the cleaning water inlet, and the cyclone three-phase separator is arranged in the shell and positioned at the top thereof.

4. The domestic sewage treatment system according to claim 2 , wherein: the shape coalescer comprises a third body, with a second water inlet, a second water outlet and a purified oil outlet arranged thereon and with a fluid homogenizer, a coarse granulation module, a fast separation module and a deep separation module arranged therein in sequence.

Assignees

• Univ Sichuan
• Univ East China Science & Tech

Inventors

• Jiang Xia
• Gan Fengli
• Liu Yi
• Sun Yuxiao
• Wang Hualin
• Han Yafang

Classifications

• C02F2201/002

  Construction details of the apparatus · CPC title

• C02F2101/30

  Organic compounds · CPC title

• C02F2001/007

  Processes including a sedimentation step · CPC title

• C02F1/28

  by sorption (using ion-exchange C02F1/42; sorbent compositions B01J) · CPC title

• C02F3/34

  characterised by the microorganisms used · CPC title