CN101734756A

CN101734756A - System for automatically adjusting PH of reverse osmosis produced water

Info

Publication number: CN101734756A
Application number: CN200810162098A
Authority: CN
Inventors: 韩琳
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-11-20
Filing date: 2008-11-20
Publication date: 2010-06-16

Abstract

The invention discloses a system for automatically adjusting PH of reverse osmosis produced water, which comprises an antisludging agent feeding device, an acid dosing device, an alkalifying device, a security filter, a high-pressure pump, a reverse osmosis device, a PH meter, a conductivity (CI) meter and a PLC. The system detects the PH of the reverse osmosis produced water through the PH meter on a reverse osmosis water production pipeline and feeds the detected PH back to the PLC; and the PLC compares the PH of the reverse osmosis produced water set according to requirements with the onsite PH of the reverse osmosis produced water and sends an instruction to a PH adjustment device to adjust the acid dosage of the acid dosing device or adjust the alkali dosage of the alkalifying device, so that the PH of the reverse osmosis produced water reaches a set value as required and simultaneously the conductivity of the reverse osmosis produced water can reach a required value.

Description

A kind of automatic adjusting PH of reverse osmosis produced water system

Technical field

The present invention relates to a kind ofly can regulate the PH of reverse osmosis produced water system automatically, particularly a kind of under PH of reverse osmosis produced water meets the requirements of prerequisite, it produces water conductivity also can meet the requirements of reverse osmosis system simultaneously.

Background technology

It is comparatively general at present to use reverse osmosis system to make pure water, characteristics such as water quality treatment wide ranges, effluent quality are good, environmental protection that it has.But reverse osmosis system produces water PH and can not control, thereby does not often reach the PH of reverse osmosis produced water of requirement; For meeting the requirements of PH of reverse osmosis produced water, just directly reverse osmosis produced water is added acid or adds alkaline purification, cause reverse osmosis produced water conductivity sharply to rise, make the serious variation of reverse osmosis produced water water quality, reached requirement though PH of reverse osmosis produced water occurs, the phenomenon that exceeds standard then appears in reverse osmosis produced water conductivity.

Summary of the invention

The technical problem that quasi-solution of the present invention is determined is: reverse osmosis system produces water PH as required, can automatically adjust; When reverse osmosis system product water PH reached requirement, its conductivity indices also can reach requirement simultaneously simultaneously.

Embodiment of the present invention are: with the Scale inhibitors throwing device, add sour device, adder-subtractor, security personnel's filter, high-pressure pump, reverse osmosis unit, PH instrument, CI (specific conductivity) instrument and be linked in sequence with pipeline, and the signal that they are relevant concentrates on the PLC controller, is controlled the product water PH of reverse osmosis system automatically by PLC.

The invention has the beneficial effects as follows: reverse osmosis system as required produces water PH, automatically adjusts, and can guarantee that the product water PH of reverse osmosis system and specific conductivity reach requirement simultaneously.

Description of drawings

Accompanying drawing is an overall structure synoptic diagram of the present invention.

Embodiment

The invention will be further described below in conjunction with accompanying drawing.

As accompanying drawing; The pretreated water (1) that obtains from pretreatment system is as former water, after adding Scale inhibitors at Scale inhibitors throwing device (12), adding sour device (11) and add acid or adder-subtractor (10) and add alkali, after (2) carry out contaminant filter by security personnel's filters, enter high-pressure pump (3), after high-pressure pump (3) pressurization, deliver to reverse osmosis unit (4), after reverse osmosis unit (4) is handled, the pure water of output through PH instrument (7), CI (specific conductivity) instrument (6) detect qualified after, become outer for pure water (5); Concentrated water discharge after reverse osmosis unit (4) is handled is to dense pond (8); Wherein the control signal in the reverse osmosis system concentrates on the PLC controller (9), by the signal of PLC controller (9) by collecting, with the reverse osmosis produced water set(ting)value that requires relatively, automatically adjusting adds the acid amount that adds of sour device (11), or adder-subtractor (10) add alkali number.

Be the concrete performance of the present invention below.

Embodiment one

For given Yuan Shui water source, require reverse osmosis system to produce water PH 〉=6.5, specific conductivity≤10 μ s/cm.

As seen from the above table, under certain former water condition, reverse osmosis system of the present invention is by PH instrument on the reverse osmosis produced waterpipe, and detecting PH of reverse osmosis produced water is 5.8, and it feeds back on the PLC controller, the PLC controller compares it and the PH that requires 〉=6.5, illustrate that PH is on the low side, need add alkali and regulate PH, its PH is raise, thereby its notice adder-subtractor adds alkali and regulates, and reaches requirement until PH of reverse osmosis produced water; When adding alkali adjusting reverse osmosis system product water PH, it produces water conductivity and reduces the water quality raising; At this moment owing to after in water inlet, adding alkali, reduced the influence of gas soluble in water to reverse osmosis produced water water quality; It makes reverse osmosis system produce water PH and specific conductivity has reached requirement simultaneously.

Embodiment two

For given Yuan Shui water source, require reverse osmosis system to produce water PH≤5.5, specific conductivity≤10 μ s/cm.

As seen from the above table, under certain former water condition, reverse osmosis system of the present invention is by PH instrument on the reverse osmosis produced waterpipe, and detecting PH of reverse osmosis produced water is 5.8, and it feeds back on the PLC controller, the PLC controller compares it and the PH that requires≤5.5, illustrate that PH is higher, need add acid and regulate PH, its PH is reduced, thereby its notice adds sour device and adds acid and regulate, and reaches requirement until PH of reverse osmosis produced water; When water inlet adds acid adjusting PH to reverse osmosis unit, its reverse osmosis system produces water conductivity to be increased, water quality reduces, but still can meet the requirements of the product water conductivity, at this moment owing in the reverse osmosis unit water inlet, add acid, its most of ion is held back by reverse osmosis membrane, and is less to the reverse osmosis produced water water quality impact.

By above example explanation, reverse osmosis system of the present invention can automatically adjust to PH of reverse osmosis produced water by the PLC controller, and can make reverse osmosis system product water PH and specific conductivity reach requirement simultaneously.

Claims

1. automatically regulate the PH of reverse osmosis produced water system for one kind, it is characterized in that it by Scale inhibitors throwing device (12), add sour device (11), adder-subtractor (10), security personnel's filter (2), high-pressure pump (3), reverse osmosis unit (4), CI (specific conductivity) instrument (6), PH instrument (7), PLC controller (9) and corresponding connection fittings and form.