CN105565590A

CN105565590A - Advanced treatment system of high-concentration methanol wastewater by DAT-IAT (demand aeration tank-intermittent aeration tank) technique

Info

Publication number: CN105565590A
Application number: CN201510939256.3A
Authority: CN
Inventors: 潘敏
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-12-14
Filing date: 2015-12-14
Publication date: 2016-05-11

Abstract

The invention discloses an advanced treatment system of high-concentration methanol wastewater by a DAT-IAT (demand aeration tank-intermittent aeration tank) technique, and provides a lower-operating-cost methanol wastewater treatment system capable of effectively protecting the environment. The system comprises a grid tank, a production wastewater collecting tank, a wastewater regulating tank, a micro-vortex high-efficiency precipitator, a dosing chamber 1, a DAT-IAT reaction tank, a dosing chamber 2, an aeration biological filter, an effluent water monitoring tank, a wastewater homogenizing tank, a sludge tank, a sludge dewaterer room and communicating pipelines.

Description

A kind of system adopting DAT-IAT technique advanced treatment high concentration methanol waste water

Technical field

The present invention relates to technical field of sewage, particularly relate to the treatment system of methanol waste water.

Background technology

Methyl alcohol colourlessly has the volatile liquid of alcohol smell.Poisonous, drink 5 ~ 10 milliliters can be lost the sight of both eyes by mistake, drinks in a large number and can cause death.For the manufacture of formaldehyde and agricultural chemicals etc., and be used as the denaturing agent etc. of organic extraction agent and alcohol.Have hypotoxicity to water microorganisms, concentration is that the methyl alcohol of 790mg/L can make organic discomposing effect in biological filter weaken; Concentration is the digestion that the methyl alcohol of 5000mg/L can suppress mud in digester.Methanol waste water refers in methanol industry production or use procedure, the vinasse of being discharged by rectifier bottoms, mainly containing methyl alcohol, ethanol, senior alcohols and aldehydes and a small amount of long-chain compound, has waxy substance to separate out during low temperature, its ammonia nitrogen and COD content higher, belong to easy degrading high concentration organic waste water.

There is strict regulation in country to the discharge containing methanol industrial wastewater, just can enter in rivers and lakes or enter field irrigation after treatedly must reaching certain standard.According to the feature of methanol waste water, existing and be applied to industry treatment process have burning method, anaerobism, aerobic biochemical process etc.Result shows, methanol waste water intractability is comparatively large, and investment cost is higher.

Summary of the invention

The invention discloses a kind of system adopting DAT-IAT technique advanced treatment high concentration methanol waste water, its step is as follows:

(1) methanol waste water enters grating tank through pipeline, establishes grid to remove larger floating matter and suspended substance in pond, ensures the normal operation of subsequent processing device.

(2) sewage flows automatically to equalizing tank after grid, and this pond can ensure to dispose of sewage water quality evenly, and the water yield is stablized.Preaeration system is set in equalizing tank, but the instantaneous air feed of interval, both can prevent the smelly and suspended substance of water quality anaerobism from not precipitating, and a part of pollutent can have been removed when not increasing the equipment residence time again, alleviating the influent load of follow-up equipment.

In methanol waste water equalizing tank, establish the in-line meters such as the online instrument of fluid level transmitter, COD, the online instrument of pH, the online instrument of ammonia nitrogen and the online instrument of SS, and establish magnetic flow meter in lift pump outlet, the methanol waste water entering sewage works is measured.

(3) methanol waste water fully mixes in pond, homogeneous is promoted to micro-eddy current high-efficiency settling vessel through pump after all measuring adjustment and carries out coagulating kinetics, mainly removes the pollutent existed with colloid and aerosol form, meanwhile, and organics removal and hardness.1 PAC added between sewage and dosing, after PAM liquid and lime solution are fully mixed by line mixer, enter micro swirl flocculation reaction district, countless small vortex is produced in reaction zone, the migration that micro-vortex is conducive to fine particle in water is condensed with collision, improve reaction efficiency, flocculated by microvovtex and contact flocculation dual function, colloid and the medicament of sewage fully react, progressively form larger flco, through sufficient coagulation, flocculation, mud after precipitation is separated flocculation zone, isolated mud drains into sludge sump through spoil disposal pipeline, settling vessel water outlet flow to DAT-IAT reaction tank by self gravitation.

(4) DAT-IAT is composed in series by DAT pond and IAT pond.DAT continuum micromeehanics, continuous aeration (also can intermittent aeration), the complete mixing pattern of Chi Zhongcheng is the organic main place of microbiological deterioration; IAT continuum micromeehanics, intermittent aeration, removes the organism in sewage further, makes sewage reach emission standard.After process, water and residual active sludge are discharged by IAT.

First sewage enters continuous aeration in DAT pond continuously, and in pond, current present complete mixing pattern, and most of organism is degraded; Mixed solution after DAT process successively enters IAT pond by the flow guide system between two ponds, IAT intermittent aeration thus increase the concentration gradient of pollutent to microorganism in the mode that the time and space combines, further organics removal, makes process water outlet reach emission standard.

Precipitate phase only occurs in IAT.After IAT stops aeration, active pollution index static state deposition is separated with supernatant liquor, and the mixed solution flow velocity that DAT flows into IAT is very low, and do not produce disturbance to IAT, therefore its deposition efficiency is significantly higher than the dynamic precipitation of general second pond.

Bleeding stage only occurs in IAT.When pond median water level rises to top water-level, precipitate phase terminates, and the water decanter being arranged on IAT end starts, and is discharged lentamente outside pond by supernatant liquor, stops draining when pond median water level drops to lowest water level.

Between dosing, 2 mainly comprise microcosmic salt medicine system, alkali storage and dosing system and microcosmic salt solution storage and delivery system.Phosphoric acid salt medicine system provides microorganism and grows necessary nutrition to reaction tank, the object adding alkali lye is that the object adding microcosmic salt is to meet microbial metabolism needs in biological process in order to the pH value met in DAT-IAT reaction tank is in the good order and condition of Institute of Micro-biology's needs all the time.

(5) water outlet of BAF enters water outlet monitoring pool, and water outlet monitoring pool establishes the in-line meters such as the online instrument of COD, the online instrument of pH, the online instrument of ammonia nitrogen and the online instrument of SS, immediately uploads effluent quality index.If effluent quality is qualified, directly enter waste water homogeneous pond; If defective, be directly promoted to BAF through pump and do further biochemical treatment.

(6) body refuse of sewage works settling vessel discharge, the excess sludge of DAT-IAT reaction tank discharge enter sludge sump respectively, be promoted between sludge dewatering through sludge lifting pump after sludge sump fully mixes and carry out processed, the mud cake after dehydration directly transports outward process.

Accompanying drawing explanation

Fig. 1 is structure iron of the present invention;

The invention has the beneficial effects as follows:

Physico-chemical pretreatment+DAT-IAT technique advanced treatment high concentration methanol waste water, good removal effect is had to methyl alcohol, composite wastewater is after pre-treatment above, be introduced into the preliminary aerobic biochemical of DAT section, enter IAT section degree of depth aerobic biochemical again, DAT section serves waterpower proportionality action due to continuous aeration, improves the stability of whole technique, to be removed the organic pollutant in sewage in IAT section by the Degradation of microorganism further.Part active sludge is back to DAT section by IAT section, improves DAT section activated sludge concentration.

Claims

1. adopt a system for DAT-IAT technique advanced treatment high concentration methanol waste water, it is characterized in that: its step is as follows: