Leather wastewater treatment system and method

[0027] Example 1

[0028] Leather wastewater treatment system according to this embodiment, specific technical solutions are as follows:

[0029] Leather wastewater treatment system, comprising a water jet mixed digestive cloth, cloth jets of water are mixed in the digestive system are different microbial agents serve nitrification bacteria. Digestive comprises mixing water jet fabric treatment tank 1, 2 and intermediate sedimentation tank 3, the central processing cell 11 1 is provided with a biofilm, the biofilm 11 treatment tank 12 and jet mixing aeration zone 1 is divided into 13 regions, aeration region 12 is provided with a suction pipe 64 shown in the second jet mixer ejector pipe 62 is connected to the suction digestion zone nitrate solution injection jet mixer 62 mixing jet mixing zone 13, and through the reflux control valve 65 controls the suction nitrification fluid back flow. Pool 2 is connected to the intermediate cell serving cell 4, the intermediate connector 2 pool jet mixing zone 13, the serving cell serving cell 4 heterotrophic denitrifying bacteria and bacterial agents connected to the aeration zone 12, the top of the aeration zone 12 communicates with the sedimentation tank 3 communicates, the bottom region of the sedimentation tank 3 and the middle of the pool 2. Wherein the intermediate tank 2 for mixing wastewater with nitrifying bacteria microbial agents, and for precipitation precipitated from the treatment tank 3 having a sludge suspension were carried out in a transfer process. 11 for the biofilm bacterial enrichment.

[0030] Further comprising a stirring aeration means the aeration stirring device comprises a blower 51 and a plurality of aeration tubes 52, a plurality of tubes 52 extending into the bottom region of aeration aeration zone 12 and are connected to the blower 51. The blower 51 to the aeration tube 52 into the aeration gas, the treatment tank 1 in the aeration zone 12 as aerobic tank, for aerobic treatment of wastewater.

[0031] Jet mixing region 13 provided with a plurality of first substrate region 61 and a plurality of second jet mixer jet mixer 62, a first plurality of jet mixer 61 and a plurality of second jet mixer 62 are the circulating pump through the main pipe and 63 are connected, respectively, the circulation pump 63 from the water jet mixing tank 2 and the intermediate region 13, and the injector 13 through the first water distribution within the jet mixer 61 and the second jet to jet mixer 62 mixing zone, a second plurality of jet mixing 62 are connected by a main gas pipe to the blower 51. Processing pool jet mixing zone to the anaerobic tank 113, a first mixer 61 and second jet 62 pairs jet mixer for jet mixing tank, 12 is provided in the aeration zone nitrate solution is mixed with the second suction pipe 64 shown in FIG jet Entrained line 62 is connected to the aeration zone 12 nitrification liquid jet mixer 62 into the second mixing injection jet mixing zone 13, and through the reflux control valve 65 controls the flow back to the suction nitrate solution, when it is necessary to mix the jet when aeration mixing zone, can only close the reflux control valve 65 and flow valve 66 to open exit. Jet mixer is 4-10cm aperture, orifice flow rate reaches 10-15m / s, clogging does not occur, a second jet mixer 62 communicates with the blower 51, can also be ~ weekly intervals for one month exposure jet mixing zone 13 gas, to facilitate cleaning treatment tank 1, and to reduce the generation of hydrogen sulfide bacteria, reduce security risks.

[0032]Heterotrophic nitrification bacteria to bacteria crane Haneda Delft (Delftia tsuruhatensis) KHN-HT01, separated from the leachate wastewater treatment system (which 16S rDNA sequencing results see Genbank MG543680), accession number CCTCCNO: M 2017664. Nitrifying bacteria microbial agents in nitrifying bacteria viable cells ≥1 × 10 9CFU / mL.

[0033] The present embodiment also provides a method of treating wastewater of leather, based on the above system, the heterotrophic microbial agents nitrifying bacteria (final concentration of 10 ~ 100mg crane Haneda Delft bacteria KHN-HT01 cells / L water) run on agents serving cell, leather waste water introduced into the mixing jets digestive cloth, nitrifying bacteria and microbial agent is introduced into the pool of agents to serve jet mixing water distribution digestive processes. Specifically, the following steps:

[0034] S1, the heterotrophic denitrifying bacteria microbial agents serving cell in the serving agents;

[0035] S2, the wastewater introduced into the middle of the pool 2 leather, microbial agents and agents nitrifying bacteria is introduced into the intermediate serving cell pool 2;

[0036] S3, the middle of the pool 2 through the waste water circulation pump 63 is a first jet mixer 61 and the second mixer 62 is sprayed into the jet 13 jet mixing zone;

[0037] S4, the waste water in the mixing zone 13 of the jet rising through the overflow 11 to the biofilm aeration zone 12, nitrifying bacteria and bacterial agents introduced into the pool of agents to serve the aeration zone 12, open aeration stirring device 12 in the treatment of wastewater aeration zone;

[0038] S5, aeration zone and a second suction pipe 12 is provided as shown in the mixer jet ejector pipe 62 is connected to the aeration zone 12 nitrification liquid injection jet mixer suction jet mixing zone 13, and by adjusting the suction control valve nitrification liquid sucked back into traffic.

[0039] S6, the wastewater in the aeration zone 12, the rising water level and overflows to the precipitation tank 3, the waste water in the sedimentation tank 3 after precipitation treatment in the sedimentation tank 3 supernatant to meet emission standards is discharged from the top of the overflow outlet , sedimentation 3 reintroduced into the lower middle of the pool 2 suspension loop processing.

[0040] Wherein preparation nitrifying bacteria microbial agents as follows: the crane Haneda Delft KHN-HT01 strain inoculated basal medium supplemented with 0.4g / L NH4Cl and 2g / L sodium acetate, culture to log phase, then the bacteria suspension was centrifuged to collect the cells and the cells were resuspended with basal media, starved 1D, heterotrophic bacteria obtained microbial agents is the nitrifying bacteria.

[0041] Example 2

[0042] In this embodiment, nitrifying bacteria Delftia tsuruhatensis HT01 base medium is: MgSO4 · 7H2O 0.05g / L; K2HPO41g / L; NaCl 2g / L; FeSO4 · 7H2O 0.4g / L; NaHCO3 1.5g / L; CaCl2 · 2H2O 0.5g / L; trace elements 1mL / L; pure water.

[0043] Trace elements (1L): CuSO4 · 5H2O 0.075g; ZnSO4 · 7H2O 0.3g; CoCl2 · 6H2O 0.375g; MnCl2 · 2H2O 0.3g; EDTA 0.5g; NaMoO4 · 2H2O 0.22g; H3BO4 0.014g; water 1L.

[0044] Conventional carbon source medium: Add 0.4g / L NH4Cl basal medium as the sole nitrogen source, and then were added 2g / L sucrose, glucose, fructose, sodium citrate, sodium succinate, sodium acetate or molasses as the sole carbon source.

[0045] Sewage leather as material, due to the higher salinity of the water (about 20000mg / L) are not suitable for the growth of autotrophic ammonia-oxidizing bacteria, the fluctuation range of the COD and ammonia water during the experiment were 4350 ~ 5355mg / L and 687 ~ 768mg / L. Experiment two rounds, a first series of experiments, the experimental group was inoculated to 1 t of sewage 3.5L D.tsuruhatensis HT01 sodium acetate as sole carbon source log phase bacteria, as well as sodium acetate was added to the sewage 1.4kg , and cultured at day vented to the respective 3,4,5,6 1.4kg sodium acetate supplemented culture was continued to day 7, and measuring ammonia concentration in the effluent COD period. No bacteria were added to the control group (but with the same dose of the experimental group supplemented with sodium acetate), neither the control group plus broth, do not add sodium acetate. The water temperature during the test was 21 ~ 23 ℃, dissolved oxygen of 3.22 ~ 5.59mg / L, pH 7.8 to 8.

[0046] Sewage order to simulate the effect of the batch, and a second round of tests carried out: taking a first round of culture to day 7 experimental groups sewage 0.5 tons, 0.5 tons of sewage untreated, 1.4kg of sodium acetate were added simultaneously, and on day 2 of culture to complement 1.4kg of sodium acetate was added, and culture was continued to day 3, and measuring ammonia concentration in the effluent COD period. And setting change temperature, pH and dissolved oxygen during the test of the control group and the control group are the same as the first round of tests.

[0047] The first round of tests to see changes in ammonia and COD removal figure 2. Seen, and the supplemental carbon source after inoculation HT01 (sodium acetate), wastewater COD removal and ammonia were significantly higher than the control group (p <0.05), to the end of the first round of experiment (day 7), ammonia and COD removal efficiency of the test group reached 47% and 79%, respectively, while the control group only 28% and 49% removal, but removal of the control group was only 15% and 36%, indicating significantly promote leather HT01 sewage synchronized remove ammonia and COD.

[0048] The second round of tests on the change in ammonia and COD removal, see image 3. Similar to the results of the first round of testing, the test group of ammonia and COD removal rate was significantly higher than the control group (p <0.05).

[0049] Comparison of these two field tests in waste water, to a second round of tests on day 3, i.e., ammonia removal efficiency test group reached 49%, and even higher than the first round of ammonia removal experiment on day 7 (47%). Since the first round of test inoculation HT01 only 0.35%, while the second round of testing was 50% water change, we can continue to grow in HT01 described the first round of testing, and accumulate more biomass, Therefore, in the second round of tests showed a faster rate in deamination. Further, when the two end points, TN removal test group (average 22%) and the control group was also significantly higher (average 11%), also described in this strain can be removed in leather pilot part of the total nitrogen in wastewater.

[0050] Example 3

[0051] Paper Co., Ltd. Xinji leather a leather wastewater using wastewater treatment system and method provided in Example 1, the daily transdermal system for treating wastewater industrial wastewater 1800m3 / d, days before leather wastewater treatment system provided in Example 1 of the embodiment is not input No amount of sludge 60 tons (dry mud) / per day, the amount of primary sedimentation tank PAC 200kg / d, PAM dosage 8kg / d, put into use 40 tons embodiment amount leather sludge wastewater treatment system provided in Example 1 (dry mud) / day, primary sedimentation tank to stop using the PAC, PAM dosage of 5kg / d, pulse anaerobic tank can not only reduce the amount of sludge, it can also reduce the amount of reagent for companies to reduce operating costs.