CN207933210U - A kind of percolation liquid treating system for high salinity biodegradability difference - Google Patents

Abstract

The utility model discloses a kind of percolation liquid treating system for high salinity biodegradability difference, including coagulative precipitation tank, two-stage DTRO systems, DTNF, DTRO L, advanced oxidation equipment and MVR crystallizing evaporators；The coagulative precipitation tank water outlet termination two-stage DTRO system water inlet ends, the outlet of two-stage DTRO system concentrated waters connects DTNF water inlet ends, DTNF production water outs connect DTRO L water inlet ends, the outlet of DTNF concentrated waters connects advanced oxidation equipment water inlet end, DTRO L production water outs connect two-stage DTRO system water inlet ends, the outlet of DTRO L concentrated waters connects MVR crystallizing evaporators, and MVR crystallizing evaporators condensation-water drain connects tapping equipment jointly with two-stage DTRO systems production water out.The utility model can effectively improve the yield of production water, reduce the operating pressure of membranous system while ensureing to produce water qualified discharge.

Description

A kind of percolation liquid treating system for high salinity biodegradability difference

Technical field

The utility model is related to technical field of landfill leachate treatment, and it is a kind of poor for high salinity biodegradability to refer in particular to Percolation liquid treating system.

Background technology

Landfill leachate belongs to high concentration hard-degraded organic waste water, has complicated component, pollutant concentration height, biological nutrition Proportional imbalance, coloration are high, the feature that stink is big, biodegradability is poor, and therefore, the processing of landfill leachate is always a kind of difficult High-concentration waste water.Either garbage loading embeading or waste incineration all inevitably generates landfill leachate, with《Life rubbish Rubbish landfill yard contamination control standard》(GB16889-2008) strict implement, the at present processing of landfill leachate gradually form " raw The prevailing technology of change+MBR+NF+RO " and " two-stage DTRO ".

For some special landfill yards, if any the landfill yard of landfill lime-ash, the characteristics of percolate is that salt content is high （30000 ~ 50000mg/L or more）, COD high（Up to 20000 ~ 30000mg/L）, ammonia-nitrogen content height（Up to 2000mg/L with On）, mesohaline content has been more than the tolerance salinity of microorganism, therefore almost infeasible using " biochemistry+MBR+NF+RO ". There are some percolates directly two-stage DTRO systems to be used to handle, since water inlet salt content is too high, leads to two-stage DTRO system operations Pressure is high, production water yield is often relatively low, and generates a large amount of high COD concentrated waters with high salt（About 35 ~ 45%）It needs to carry out recharge, largely The recharge of concentrated water is easy to cause salinity and COD accumulations, is easy to form vicious circle, causes system can not continuous and steady operation.Needle This high salt organic waste water is needed to handle using scientific and reasonable group technology.

Utility model content

The utility model aim is to provide a kind of percolation liquid treating system for high salinity biodegradability difference, can protect While card production water qualified discharge, the yield of high yield water is effectively carried, reduces the operating pressure of membranous system, and it has operation Simplicity, economical and efficient, highly practical feature.

In order to achieve the above objectives, the solution of the utility model is：

A kind of percolation liquid treating system for high salinity biodegradability difference, including coagulative precipitation tank, two-stage DTRO systems, DTNF, DTRO-L, advanced oxidation equipment and MVR crystallizing evaporators；Coagulative precipitation tank water outlet termination two-stage DTRO systems into Water end (W.E.), the outlet of two-stage DTRO system concentrated waters connect DTNF water inlet ends, and DTNF production water outs connect DTRO-L water inlet ends, the outlet of DTNF concentrated waters Advanced oxidation equipment water inlet end is connect, DTRO-L production water outs connect two-stage DTRO system water inlet ends, and the outlet of DTRO-L concentrated waters connects MVR steamings Crystallizer is sent out, MVR crystallizing evaporators condensation-water drain connects tapping equipment jointly with two-stage DTRO systems production water out.

After adopting the above scheme, the work of a kind of percolation liquid treating system for high salinity biodegradability difference of the utility model It is as process：

（1）The a large amount of suspended matters and part larger molecular organics in percolate are removed using coagulating sedimentation mode；

（2）The pretreated supernatant of coagulating sedimentation enters two-stage DTRO systems（Two-stage disc tube reverse osmosis (dt-ro) membrane module）, Obtain two-stage DTRO production water and two-stage DTRO concentrated waters；

（3）Using DTNF（Dish tubular nanofiltration membrane component）To step（2）In two-stage DTRO concentrated waters carry out a point salt, obtain DTNF produces water and DTNF concentrated waters；

（4）Using DTRO-L（Monopole disc tube reverse osmosis (dt-ro) membrane module）To step（3）Middle DTNF productions water is concentrated, and is obtained DTRO-L produces water and DTRO-L concentrated waters, and DTRO-L production water is back to step（2）The water inlet end of middle two-stage DTRO；

（5）Using advanced oxidation processing step（3）In DTNF concentrated waters, remove high-enriched organics, then recharge is to filling out Bury field；

（6）Using MVR crystallizing evaporator processing steps（4）In DTRO-L concentrated waters, obtain crystallization be precipitated salt and MVR condensation Water, wherein condensed water and step（2）In two-stage DTRO production water mixing after qualified discharge, row's processing outside crystal salt.

Further, the step（1）It is middle to use PAC（Aluminium polychloride）As coagulant, PAC dosages 300 ~ 500ppm。

Further, the step（2）The pressure rating of middle two-stage DTRO is 90bar, and inlet flow-patterm is controlled in 6-6.5, scale inhibition 3 ~ 5ppm of agent dosage；

The first order DTRO concentrated waters of the two-stage DTRO systems enter DTNF, second level DTRO concentrate recirculations to two-stage DTRO System water inlet end.

Further, the step（3）DTNF pressure ratings are 75bar, and inlet flow-patterm control is 6 ~ 6.5, scale inhibitor dosing amount 3 ~5ppm。

Further, the step（4）DTRO-L pressure ratings are 90bar, and inlet flow-patterm control reaches in 6 ~ 6.5, TDS 50000mg/L or more, 3 ~ 5ppm of scale inhibitor dosing amount.

Further, the step（5）It is middle that advanced oxidation processing is carried out using ozone.

The utility model has the beneficial effect that：The utility model oozes high salinity difficulty biochemical treatment using multiple combinations technique Filtrate is handled, and coagulating sedimentation pretreatment effectively eliminates a large amount of suspended matters and the partial organic substances in percolate stoste, Two-stage DTRO ensures production water qualified discharge, divides salt using DTNF, reduces the osmotic pressure of system, while reducing and expecting into MVR The hardness and organic concentration of liquid can effectively be kept away compared to the concentrate for directly evaporating percolate or two-stage DTRO using MVR Exempt from the risk of fouling in MVR evaporation processes.After MVR evaporative crystallizations can by salinity in a manner of crystal salt discharge system so that it is whole A percolation liquid treating system salinity is unlikely to accumulate.Condensate produces water mixing qualified discharge with two-stage DTRO, greatly improves whole The yield of system system production water, advanced oxidation with avoiding the accumulation of organic matter in systems, scientific and reasonable process combination Enable the stable operation of the percolate stability and high efficiency of high salinity difficulty biochemical treatment, while being provided newly for percolate " zero-emission " Thinking.

Description of the drawings

Fig. 1 is the leachate processing method flow chart of the utility model；

Fig. 2 is the utility model diafiltration liquid processing device structure diagram.

Label declaration

Coagulative precipitation tank 1

Two-stage DTRO systems 2

DTNF 3

DTRO-L 4

Advanced oxidation equipment 5

MVR crystallizing evaporators 6.

Specific implementation mode

The utility model is described in detail below in conjunction with drawings and the specific embodiments.

As shown in Fig. 2, a kind of percolation liquid treating system for high salinity biodegradability difference that the present embodiment discloses, including Coagulative precipitation tank 1, two-stage DTRO systems 2, DTN3F, DTRO-L4, advanced oxidation equipment 5 and MVR crystallizing evaporators 6；Coagulation is heavy 2 water inlet end of the water outlet of shallow lake pond 1 termination two-stage DTRO systems, the outlet of 2 concentrated water of two-stage DTRO systems connect DTNF3 water inlet ends, and DTNF3 produces water Outlet connects DTRO-L4 water inlet ends, and the outlet of DTNF3 concentrated waters connects 5 water inlet end of advanced oxidation equipment, and DTRO-L4 production water outs connect two-stage 2 water inlet end of DTRO systems, the outlet of DTRO-L4 concentrated waters connect MVR crystallizing evaporators 6,6 device condensation-water drain of MVR evaporative crystallizations and two Grade DTRO systems 2 produce water out and connect tapping equipment jointly, and tapping equipment is for mixing 6 device condensed water of MVR evaporative crystallizations and DTRO System 2 is discharged after producing water.

Please refer to Fig.1 a kind of described, above-mentioned percolate for high salinity biodegradability difference that the utility model also discloses The process flow of processing system, includes the following steps：

（1）Percolate is pumped into coagulative precipitation tank first, the accessible percolate TDS of the utility model can reach 30000mg/L or more, COD are in 20000 ~ 30000mg/L, ammonia-nitrogen content 2000mg/L or more, and biodegradability is poor；At the present embodiment The percolate COD of reason（COD）, ammonia nitrogen, TDS（Total dissolved solidss）And SS（Suspended matter）Respectively 20900mg/L, 2896mg/L, 37870mg/L and 880mg/L, inflow 500t/d, using the PAC of 300 ~ 500ppm of dosage（Polyaluminium Aluminium）As coagulant, the PAC that this example adds 500ppm according to the specific parameter of percolate carries out coagulation to landfill leachate stoste Precipitation pretreatment, remove percolate in a large amount of suspended matters and part larger molecular organics, obtain 428t/d supernatant and The sludge of 72t/d, direct landfill disposal after sludge dewatering, the water-quality COD of supernatant, ammonia nitrogen, TDS and SS are respectively after pretreatment 15446mg/L, 2900mg/L, 38000mg/L and 528mg/L；

（2）Then, the supernatant of 428t/d after pretreatment is pumped into two-stage DTRO（Two-stage disc tube reverse osmosis (dt-ro) membrane module） System, the reverse osmosis membrane are dish tubular structure, and antifouling property is good, and two-stage DTRO system pressure grades are 90bar, inlet flow-patterm control For system 6 ~ 6.5, the specific dosage of scale inhibitor dosing 3 ~ 5ppm of amount, this example antisludging agent are 5ppm；

Two-stage DTRO systems are 95% or more to the rejection of monovalent salt, 60% or more the producing water ratio of first order DTRO, fortune Row pressure 80bar；90% or more second level DTRO producing water ratios, operating pressure 40bar；Wherein second level DTRO concentrate recirculations are extremely First order DTRO water inlet ends, two-stage DTRO production water COD, ammonia nitrogen and total nitrogen are respectively 60mg/L, 4.3mg/L and 5.7mg/L, 302t/d two-stages DTRO production water indices meet《Household refuse landfill sites contamination control standard》（GB16889-2008）In Two discharge standard of table, can direct emission；The first order DTRO concentrated waters of 205t/d enter DTNF（Dish tubular nanofiltration membrane component）Divide salt, The second level DTRO concentrate recirculations of 34t/d are to two-stage DTRO system water inlet ends；

（3）Then, using DTNF to step（2）The concentrated water of 205t/d two-stages DTRO carries out a point salt, and DTNF films are also dish pipe Formula structure, antifouling property is good, and pressure rating 75bar, DTNF water inlet TDS can reach 70000 ~ 80000mg/L or more, this Example step（2）Treated influent COD and TDS are respectively 38000mg/L and 73900mg/L, operating pressure 40bar, pH control System is 6 ~ 6.5, scale inhibitor dosing amount 5ppm；

DTNF producing water ratios reach 70%, and the DTNF production water of 144t/d enters DTRO-L systems, the DTNF concentrated waters of 62t/d into Enter advanced oxidation equipment, DTNF is 20% to the rejection of monovalent salt, and the rejection to divalent salts is 97%, has and divides salt well Effect can effectively reduce the osmotic pressure of system entirety, while remove a large amount of hardness for subsequent single-stage DTRO；

（4）Then, using the DTRO-L of loose type（Monopole disc tube reverse osmosis (dt-ro) membrane module）To step（3）In DTNF production Water is concentrated, and DTRO-L films are similarly dish tubular structure, and antifouling property is good, pressure rating 90bar, and water inlet TDS reaches To 50000mg/L or more, this example only step（3）The influent COD and TDS of processing are respectively 12000mg/L and 54000mg/L, pH Control is 6 ~ 6.5, and scale inhibitor dosing amount is controlled in 3 ~ 5ppm, this scale inhibitor dosing amount is specially 5ppm, system operation pressure Power 75bar；

It is that can reach 80 ~ 90% that DTRO-L production water yields, which can reach 50 ~ 60%, DTRO-L unit price salt rejection rates, is produced in this example Water yield 55%, monovalent salt rejection rate are 85%；

DTRO-L belongs to loose type reverse osmosis membrane, at low pressures can further be concentrated into the TDS of water inlet The DTRO-L concentrated waters TDS of 100000mg/L or more, this example 65t/d are 110000mg/L, and part TDS is mainly that monovalent salt is It is main, be conducive to subsequent evaporative crystallization；DTRO-L productions water TDS is generally 5000 ~ 7000mg/L, the DTRO-L productions of this example 79t/d Water TDS is 7000mg/L, can directly be back to step（2）The water inlet of two-stage DTRO be diluted, reduce two-stage DTRO into The salinity of water, while ensureing to produce the qualified discharge of water ammonia nitrogen；

（5）Then, using advanced oxidation equipment removal step（3）High-enriched organics in DTNF concentrated waters, advanced oxidation Equipment influent COD is 87400mg/L, and this example carries out advanced oxidation processing using ozone, after advanced oxidation, water outlet COD is 52400mg/L, and the oxidation of 62t/d goes out Water Spreading to landfill yard, has the work(of natural biological absorption degradation using landfill yard Can, the organic matter and hardness of recharge water are further decreased, organic matter and hardness is made not to be accumulated in membranous system；

（6）Finally, using MVR crystallizing evaporators to step（4）DTRO-L concentrated waters be evaporated concentration, influent COD and TDS is respectively 22000mg/L, 11000mg/L, and after above-mentioned steps are handled, the main component for TDS of intaking is monovalent salt, COD Mainly small-molecule substance, and hardness is relatively low, can avoid fouling during evaporator use, the crystal salt for obtaining 4t/d is directly outer Curing process or purification are arranged when Nacl uses, MVR condensates wash vapour system by what itself was carried, adsorb ammonia nitrogen in condensate and Partial organic substances, condensate COD are less than 30mg/L, and ammonia nitrogen is less than 10mg/L, the condensed water and step of the MVR of 61t/d（2）Two-stage Obtaining the production water of 363t/d after DTRO production water mixing, qualified discharge, the MVR crystallizing evaporators can effectively ensure that salinity together Outer row.

Compared to traditional handicraft, the percolation liquid treating system provided by the utility model for high salinity biodegradability difference has Following characteristics：

1, original percolate much uses two-stage DTRO treatment process, but since percolate concentration is higher and higher, salt Divide higher and higher so that DTRO two-stage treatment producing water ratios decline year by year, and concentrated water accounts for 30-40% than regular meeting, lead to this part concentrated water Recharge refuse landfill amount is too big, and continuing recharge can cause percolate salinity to continue to increase, and is unfavorable for percolate processing, this Utility model is by more reasonably combination, while making production water qualified discharge, and provides the row of inorganic salts and organic matter Put mouth, it is ensured that salinity and organic matter are not accumulated in systems；

2, by using DTNF（Dish tubular nanofiltration membrane component）, the concentrated water of two-stage DTRO systems is concentrated, NF is utilized The characteristic for retaining organic matter, retaining divalent salts, concentrates DTRO concentrated waters, the obtained volume of the concentrated liquid is small.By appropriate object Change is handled（The utility model selects advanced oxidation）It removes a small amount of COD while being even more the biodegradability for improving concentrate, make dense Organic matter in water is easier to be degraded by microorganisms, and returns to refuse landfill, allows refuse landfill to carry out slowly adsorption-decomposition function dirty Contaminate substance；

3, because the dialyzate of NF cannot meet direct emission standard, therefore need to recycle the DTRO-L of low pressure（I.e. low section Stay the DTRO of rate）COD and salinity are further removed, dialyzate returns to the two-stage DTRO of front, due to after NF is pre-processed, DTRO-L concentrates are mainly monovalent salt and a small amount of organic matter, monovalent salt can be taken out by evaporative crystallization, and effectively reduce The risk of fouling of evaporator；

4, evaporative crystallization MVR technologies are to come in be widely used to promote, but its important obstacle is just for percolate processing It is when evaporating waste water together with COD macromolecular COD, divalent salts（Hardness is high）Deng concentrating together, fouling of evaporator can be caused Pollution, concentrate is also a paste, cannot form crystal salt, can only be used as dangerous waste, and the utility model is in MVR evaporative crystallizations Divide salt treatment by DTNF before technology, obtained production water, which carries out concentration, can obtain the clean monovalent salt of comparison, and no longer fouling carries Can even Nacl be used as to sell after pure.

The above is only the preferred embodiment of the present invention, not to the limitation of this case design, all setting according to this case The crucial equivalent variations done of meter, each fall within the protection domain of this case.

Claims (1)

1. a kind of percolation liquid treating system for high salinity biodegradability difference, it is characterised in that：Including coagulative precipitation tank, two-stage DTRO systems, DTNF, DTRO-L, advanced oxidation equipment and MVR crystallizing evaporators；The coagulative precipitation tank water outlet termination two-stage DTRO system water inlet ends, the outlet of two-stage DTRO system concentrated waters connect DTNF water inlet ends, and DTNF production water outs connect DTRO-L water inlet ends, The outlet of DTNF concentrated waters connects advanced oxidation equipment water inlet end, and DTRO-L production water outs connect two-stage DTRO system water inlet ends, and DTRO-L is dense Water out connects MVR crystallizing evaporators, and MVR crystallizing evaporators condensation-water drain runs in jointly with two-stage DTRO systems production water out to be put Device.