CN102001800A - Method for purifying wastewater containing organosilicon - Google Patents

Abstract

The invention belongs to the field of methods for purifying wastewater, and particularly relates to a method for purifying the wastewater containing organosilicon. The invention aims to provide a low-cost method for purifying the wastewater containing the organosilicon. The method comprises the following steps of anaerobic reaction, aerobic reaction, coagulative precipitation, ozone oxidation, secondary aerobic reaction, secondary coagulative precipitation and secondary ozone oxidation. By carrying out a two-stage biochemical wastewater treatment technology and a two-stage ozone wastewater treatment technology, the cost for treating high-concentration high-toxicity high-salinity nondegradable wastewater is lowered, thereby lowering the enterprise cost. By using the method, the COD in the wastewater containing the organosilicon is directly processed to less than 100 mg/L, so that the wastewater satisfies the Integrated Wastewater Discharge Standard in China.

Description

The purifying treatment method that contains organic silicon waste water

Technical field

The invention belongs to the purifying process of waste water field, particularly contain the purifying treatment method of organic silicon waste water.

Background technology

The organosilicon production technique has determined organic pollutant complicated component in its waste water, and the existing organic character of main component polysiloxane is the characteristic of organic/inorganic substance again, is the organic substance of bio-refractory, and directly biological treatment is difficult to reach processing requirements.Traditional biochemical processing process does not almost have treatment effect to organic silicon wastewater, and many employing physico-chemical processeses (as Fenton reagent method, high-voltage corona+ozone coupling method) are handled both at home and abroad, this processing mode cost height, and difficult directly qualified discharge.The present domestic experimental study (as: little electrolysis+high-effective microorganism facture) that front end pre-treatment+biochemical process processing organic silicon wastewater occurs, this method has improved the biodegradability of organic silicon wastewater, can effectively reduce waste water COD cr, but still can't reach national sewage comprehensive emission standard (GB8978-1996) first discharge standard, advanced treatment to its factory effluent is not studied completely, the processing of the organic silicon wastewater global problem that is still up to standard.

Summary of the invention

Technical problem to be solved by this invention provides a kind of purifying treatment method that contains organic silicon waste water.

The present invention contains the purifying treatment method of organic silicon waste water for containing organic silicon waste water successively through anaerobic reaction, aerobic reaction, coagulating sedimentation, ozone oxidation, secondary aerobic reaction, second coagulation precipitation and secondary ozone Oxidation Treatment.

Described anaerobic reaction is to carry out under the air tight condition, cultivates the domestication anerobe, under anaerobic by the acting in conjunction of multiple (anaerobism or facultative) microorganism, organism is decomposed and produce and clear up gas (CH ₄And CO ₂), clear up gas and from waste water, discharge.Anaerobic process generally are divided into three continuous stages, and promptly acidication stage, product hydrogen produce the acetate stage and produces methane phase, accordingly the anaerobically fermenting microorganism are divided into the fermenting bacteria group, produce hydrogen acetogen group, methanogen floras.Described anaerobic reaction wastewater flow 1～100L/h, DO value (oxygen in water) is controlled at 0.01～10mg/L.MLSS is as greater than 50% o'clock suitable spoil disposal, and hydro-oxidation sodium or sulfuric acid dilute solution are regulated; PH is controlled between 7～7.5.

Described aerobic reaction adopts the microbial film mode, generates aerobic activated sludge in the waste water.After being specially the aerobic cultivation domestication of waste water process, make waste water DO value at 0.01～40mg/L by the air-supplying valve regulating and controlling, be preferably 4～10mg/L, biochemical post water temperature is 12～35 ℃, and the residence time is controlled to be 10～100 hours, is preferably 15～30 hours.

Described coagulating sedimentation: waste water staticly settled 0.1～10 hour, and lower floor is an aerobic activated sludge, and the upper strata clear water is introduced the ozone reaction pond.

Described ozone oxidation: feed ozone amount 10～100000mg/h, 0.1～10 hour ozone time in the waste water.Be preferably 10000～30000mg/h.Ozone has the intensive oxygenizement to organism, plays decolouring and disinfectant effect.

Described secondary aerobic reaction is microbial film and biological filter bonded mode, generates aerobic activated sludge in the waste water.Adopt pottery or gac as biological filter and biomembranous carrier, after bacterial classification is tamed through aerobic cultivation, the air blast of electromagnetic air pump, by the air-supplying valve regulating and controlling, make waste water DO value at 0.01～40mg/L, be preferably 5～20mg/L, biochemical post water temperature is 12～35 ℃, residence time control 10～100 hours is preferably 15～30 hours.

Described second coagulation precipitation: waste water staticly settled 0.1～10 hour, and lower floor is an aerobic activated sludge, and the upper strata clear water is introduced secondary ozone reaction pond.

Described secondary ozone oxidation: feed ozone amount 10～100000mg/h in the waste water, 0.1～10 hour ozone time, be preferably ozone amount 20000～30000mg/h, 5～15 minutes ozone time.

The inventive method is applicable to CODcr≤3500mg/L, and chlorine ion concentration≤4000mg/L contains organic silicon waste water.

The present invention is by Two-Stage Biochemical+two-stage ozone waste water treatment process, reduces the processing costs of used water difficult to degradate such as, saltiness height big to high density, toxicity, reduces enterprise cost.

Use this technology will contain organosilyl waste water COD and directly handle below the 100mg/L, meet national sewage comprehensive emission standard (GB8978-1996) first discharge standard.

Embodiment

After the present invention will contain organic silicon waste water introducing anaerobic reation pool, under the effect of anerobe, after process hydrolysed ferment, product hydrogen produced acid, product methane three phases, waste water COD cr had reduction by a relatively large margin.Waste water is after anaerobism, introduce the aerobic reaction pond, adopt biomembrance process, the air blast of electromagnetic air pump, the waste water that obtains staticly settles, with supernatant liquor introduce in the secondary ozone reaction pond carry out advanced oxidation with ozone after, introduce secondary aerobic reaction pond, the mode that this Aerobic Pond adopts biological filter and microbial film to combine is carried out aerobic treatment, and waste water staticly settles, supernatant liquor is introduced after secondary ozone reaction pond carries out once again advanced oxidation, discharged behind the wastewater to reach standard.

Embodiment 1

Anaerobic reation pool, introducing contains organic silicon waste water (pH is controlled between 5～7.5 for chlorine ion concentration≤4000mg/l, CODcr≤3200mg/l), the about 15L/h of the flow control of feed liquor.In the anaerobic reation pool waste water DO value should＜10mg/L, should check reason when too high.Suitable spoil disposal when MLSS such as height to 50%, hydro-oxidation sodium or sulfuric acid dilute solution are regulated pH are controlled between 7～7.5 then; 20～24 hours residence time.

The aerobic reaction pond: adopt biomembrance process, the fibrous bundle of forming with filamentary fibers is as soft-filler, after aerobic cultivation domestication, wastewater flow is controlled at 2L/h, the air blast of electromagnetic air pump makes waste water DO value at 4～10mg/L, by the air-supplying valve regulating and controlling, and 20～24 hours residence time.

Coagulating sedimentation: waste water staticly settled 5 hours, and supernatant liquor is introduced the ozone reaction pond.

The ozone reaction pond: ozone amount 20000mg/h, the ozone oxidation time is 5 hours; Processed waste water is introduced secondary aerobic reaction pond.

Secondary aerobic reaction pond, this Aerobic Pond adopts the biological filter, and (waste water passes through the filter tank, filtrate is held back the suspended substance in the waste water, while is adsorbed on colloid in the waste water and dissolved matter on the surface of oneself, organism is wherein bred microorganism soon, microorganism is further adsorbed and is suspension in the waste water, the material of colloid and solubilised state also forms microbial film gradually) and the mode that combines of microbial film carry out aerobic treatment: employing activated carbon granule or stoneware particle are made bio-filter stuffing, adopt water inlet upper end, lower end water-out manners, make waste water DO value at 5～20mg/L by the air-supplying valve regulating and controlling; 20～24 hours residence time.

The second coagulation precipitation: waste water staticly settled 10 hours, and supernatant liquor is introduced secondary ozone reaction pond.

Secondary ozone reaction pond: ozone amount 30000mg/h, the ozone oxidation time is 10 minutes, discharges behind the wastewater to reach standard.

Biochemical post water temperature in two aerobic reaction ponds is 13 ℃, and waste water total residence time in system is 82h.Respectively to the biological treatment effect of each step, anaerobism, aerobic treatment effect detect, biological reaction tank dissolved oxygen, sludge concentration, biophase are monitored, measuring method sees Table 1, parameters such as SS (activated sludge concentration), DO (oxygen in water), COD (chemical oxygen demand (COD)), colourity, pH the results are shown in Table 2, and processing efficiency sees Table 3.

Table 1

Table 2 concentration unit mg/l

Table 3

Above-mentioned table 2,3 shows the treatment process of waste water through Two-Stage Biochemical+two-stage ozone, and the clearance of COD is 97%, and below the average 100mg/l of water outlet COD, and the microorganism proterties is stable, the biochemical system stable water outlet.

Claims (8)

1. contain the purifying treatment method of organic silicon waste water, it is characterized in that: contain organic silicon waste water successively through anaerobic reaction, aerobic reaction, coagulating sedimentation, ozone oxidation, secondary aerobic reaction, second coagulation precipitation and secondary ozone Oxidation Treatment.

2. the purifying treatment method that contains organic silicon waste water according to claim 1 is characterized in that: anaerobic reaction wastewater flow 1～100L/h, control DO value 0.01～10mg/L.

3. the purifying treatment method that contains organic silicon waste water according to claim 1 and 2 is characterized in that: anaerobic reaction solution MLSS is greater than 50% o'clock spoil disposal, regulator solution pH 7～7.5.

4. the purifying treatment method that contains organic silicon waste water according to claim 1 is characterized in that: aerobic reaction adopts the microbial film mode, and the control air-supplying valve is regulated waste water DO value at 0.01～40mg/L, and biochemical post water temperature is 12～35 ℃.

5. the purifying treatment method that contains organic silicon waste water according to claim 1 is characterized in that: the ozone amount 10～100000mg/h of ozone oxidation.

6. the purifying treatment method that contains organic silicon waste water according to claim 1 is characterized in that: the secondary aerobic reaction adopts microbial film and biological filter bonded mode, by the air-supplying valve regulating and controlling, makes waste water DO value at 0.01～40mg/L.

7. the purifying treatment method that contains organic silicon waste water according to claim 1 is characterized in that: ozone amount 10～100000mg/h during the secondary ozone oxidation.

8. according to each described purifying treatment method that contains organic silicon waste water of claim 1～7, it is characterized in that: contain organic silicon waste water CODcr≤3500mg/L, chlorine ion concentration≤4000mg/L.