Waste water-base drilling liquid solid formation land resource technology
Technical field
The present invention relates to pollution control in oilfield drilling process, be specifically related to waste water-base drilling liquid solid formation land resource technology.
Background technology
Rejected well drilling liquid has a little many, wide, feature that pollutant kind is many, at home, treatment process and method more, do not form processing method that is unified, specification and technique.Main employing solidifies process at present.Solidification process mainly adds curing agent to well drilling waste mud, makes rejected well drilling liquid change into solid phase, then landfill, thus avoids the pollution to environment and harm.The main component of curing agent is cement, waterglass, Al
2(SO
4)
3deng.Hardener dose is 150 ~ 200kg/m
3, solidification disposal cost is at 250 ~ 300 yuan/m
3but volume increase about 1/3 after solidification, and landfill needs to take certain land resource, and along with the increase of time, pollutant has the risk of seepage.
Application number be 001243292 patent of invention disclose a kind of solidification processing method and curing agent thereof of waste water-base drilling liquid, it is made up of waste water-base drilling liquid and hardener formula.Inorganic molysite flocculating agent 1 ~ 6%, clay absorbent 0.1 ~ 0.6%, magnesia 1 ~ 6% and cementing agent 1 ~ 10%.This formula can make waste water-base drilling liquid after solidification in 3 ~ 6 days, form the firming body with fine water resistant immersion ability and some strength, and firming body leaches pH≤7.5 of water, total Cr≤1.5mg/L, CODCr≤200mg/L, petroleum-type≤10mg/L.This solidification processing method treatment process is simple, and with short during process, curing agent is easily bought, and is applicable to harmless treatment rejected well drilling liquid in enormous quantities.Solidification process landfill needs to take certain land resource, and along with the increase of time, pollutant has risk of leakage.
Application number is that the patent of invention of CN02117325 discloses a kind of coagulating and dewatering treatment method for waste drilling fluid, in rejected well drilling liquid, specifically add inorganic aluminate flocculating agent and organic cation polyelectrolyte flocculant solution, static coagulation 10 ~ 15 minutes after stirring; After the rejected well drilling liquid completely de-steady dehydration of chemistry, then by agglomerate flocculate and part wadding water outlet centrifugal dehydration; Inorganic aluminate flocculating agent is preferably alchlor, and its use amount is 2000 ~ 3500mg/L; Organic cation polyelectrolyte flocculant is the organic cation polyelectrolyte with quaternary ammonium salt cationic functional group, condense with under the synergy of flocculation at inorganic aluminate flocculating agent and organic cation polyelectrolyte flocculant, the fine particle of suspension is impelled to gather into bulk flocculate, through centrifugal dehydration, finally reach the object of rejected well drilling liquid Separation of Solid and Liquid.Although the good Separation of Solid and Liquid realizing rejected well drilling liquid, does not carry out harmless treatment rejected well drilling liquid, also there is certain environmental risk.
Application number is a kind of method that the patent of invention of CN200710048288 discloses preparing standard sintered brick by waste drilling fluid cured resin.Solidfied material after being solidified by rejected well drilling liquid mixes with clay minerals matter and interior fire coal, the brickmaking of standard sintered brick technique is pressed as brick-making raw material, the percentage by weight of mixed material each component is solidfied material 1 ~ 35%, clay minerals matter 48 ~ 80%, interior coal-fired 15 ~ 20%.The invention solves solidfied material and will become lean property material in high-temperature sintering process, the problem that the brick of impact system is not up to standard in intensity etc., the present invention mixes solidfied material in brick-making raw material, the fired brick of gained meets national standard completely, thus reduce discharge, the process of solidfied material, turn waste into wealth again.Although this invention carries out harmless treatment to waste drilling fluid cured resin, the waste gas produced in process of baking bricks may contain poisonous and harmful substance, causes secondary pollution, and energy consumption is higher simultaneously.
Application number is that the patent of invention of CN200910079166 discloses a kind of waste drilling fluid soil remediation process in loess tableland area, and containing solid weight by rejected well drilling liquid is absolutely stir the calcium aluminium salt adding 1.0 ~ 2.0%; Quiet heavy completely after moisture is extracted out, by extraction water containing solid weight for absolutely adding 0.015 ~ 0.02% compound calcium salt; Be absolutely add the wood chip of the loess of 0.3 ~ 0.5% humic acid and loess weight 2 ~ 6%, sawdust ash or hay by rejected well drilling liquid containing solid weight, after loess addition and dehydration, the volume ratio of surplus drilling fluid solid is 1: 1; Adopt chemistry-microbial association processing method, utilize local natural loess resource, technique is simple, do not add any solidification medicament, harmful substance in drilling fluid processed by lower expense, solve Deal With Drilling Fluid costly, process is problem not thoroughly, do not destroy original soil system after process simultaneously, the requirement of soil second ploughing can be reached.Although the method technique is simple, do not add any solidification medicament, the requirement of soil second ploughing can be reached after process, but adding certain chemical agent can make rehabilitation cost increase, it is long that soil falls into disuse the time before can utilizing, ignore plant in recovery process and, for the catharsis of soil, be unfavorable for sustainable development.
Summary of the invention
The invention provides waste water-base drilling liquid solid formation land resource technology, have the advantage that treatment process is simple, practical, possess large-scale application.
Waste water-base drilling liquid solid formation land resource technology, comprises the chemical solid-liquid separation technique of waste drilling mud, parting liquid pollutant analysis technology, parting liquid solid-phase contaminants analytical technology, waste drilling mud soil technology, Soil Quality Indexes analytical technology and plant growth situation observed and recorded.
The chemical solid-liquid separation technique of described waste drilling mud comprises waste drilling mud conventional parameter determination techniques, waste drilling mud breaks glue, the chemical solid-liquid separation technique of flocculation.
Described waste drilling mud conventional parameter determination techniques, comprises waste drilling mud moisture determination, waste drilling mud gravity test, the preparation of waste drilling mud leachate and waste drilling mud leachate suspended matter determination.
Described waste drilling mud moisture determination, its method step: (1) claims about 10g sample (being accurate to 0.01g), insert in the aluminium box of known weight, put into baking oven, dry at 105 ~ 110 DEG C of temperature to constant weight (about 6h), after taking-up, put into drier cooling; (2) in drier, take out aluminium box, weigh, be accurate to 0.01g.; (3) computing formula:
In formula: W-moisture content (%);
G
0-aluminium box heavy (g);
G
1-aluminium box+wet sample heavy (g);
G
2-aluminium box+oven dry sample heavy (g).
Described waste drilling mud gravity test, its method step: (1) takes the former mud sample of certain mass M, puts into and known volume V is housed
1water graduated cylinder in, read and to add after sample liquid volume V in graduated cylinder
2; (2) computing formula:
P=M/(V
2-V
1)(2)
In formula: ρ-mud balance (g/L);
M-quality of mud fluid (g);
V
1-graduated cylinder inner volume (L);
V
2-mud and water volume (L).
Described waste drilling mud leachate preparation, mainly in conjunction with mud feature and with reference to HJ557-2010 " solid waste Leaching leaching method horizontal vibration method ", the mud leachate preparation method obtained.Its method step: (1) accurately measures the tool plug conical flask that two parts of 50ml or 100g waste drilling mud samples are placed in 2L respectively, then respectively adds deionization pure water according to liquid-solid ratio 10: 1 ratio; (2) tool plug conical flask is vertically fixed on reciprocating horizontal oscillator, regulates that oscillator frequency is 110 ± 10 times/min, amplitude is 40mm, take off conical flask after at room temperature shaking 8h, leave standstill 16h; (3) filter the upper liquid (adopt suction filtration mode, filter sizes is 0.45 μm) in tool plug conical flask, namely obtain waste drilling mud leachate.
Described waste drilling mud leachate suspended matter determination method, its method step: (1) measures the sample 100ml suction filtration fully mixed, make moisture all by filter membrane, then with each 10ml distilled water continuous washing three times, continue suction strainer to remove traces of moisture.After stopping suction filtration, carefully take out the filter membrane being loaded with suspension and be placed in the measuring cup of former constant weight, move into and move in drier after drying 1h in baking oven at 103 ~ 105 DEG C, make to be cooled to room temperature, claim its weight.Repeatedly dry, cool, weigh, till the weight difference < 0.4mg of twice weighing; (2) computing formula:
C=(A-B)*106/V(3)
In formula: concentration of suspension (mg/L) in C-water;
A-suspension+filter membrane+measuring cup weight (g);
B-filter membrane+measuring cup weight (g);
V-volume of sample (ml).
Described waste drilling mud breaks the chemical solid-liquid separation technique of glue, flocculation, its method step: (1) will regulate discarded slurry concentration; (2) a certain amount of gel breaker being configured to solution is added, with 100r/min speed rapid stirring 5min, after leaving standstill broken glue 1h; (3) a certain amount of PAC is added, with 50r/min speed low rate mixing 5min; (4) add PAM solution again after stirring, with 50r/min speed low rate mixing until the mud in beaker forms comparatively big flocculating body, after leaving standstill 30min, move into centrifuge, adopt the centrifugal 10min of rotating speed of 3000r/min, obtain Separation of Solid and Liquid phase.
Discarded slurry density after described adjustment concentration is 1.2 ~ 1.3g/ml
Best gel breaker during described process waste drilling mud is HGDJ-1, and dosage is 1.8 ~ 3g/ mud 100ml, broken glue time 30min.
Optimum flocculent during described process waste drilling mud is PAC and PAM, and its consumption is respectively 1.2 ~ 2.4g/ mud 100ml, 0.01 ~ 0.05g/ mud 100ml.
Described parting liquid pollutant analysis technology, main employing extension rate method, dichromate titration, glass electrode method, silver nitrate titration method, AAS, gravimetric method, atomic absorption spectrophotometry and flame atomic absorption method, respectively to the colourity in parting liquid, COD
cr, pH, Cl
-, oil content, suspension, lead and copper measures, with evaluating chemical method to mud solid-liquid separation effect.
Described parting liquid solid-phase contaminants analytical technology, parting liquid solid-phase contaminants extracting method adopts HJ557-2010 " solid waste Leaching leaching method horizontal vibration method ", and the Cl in Detection and Extraction thing
-, Pb, Cu, Cd, Cr, COD
cr, petroleum content, obtain the ratio that mud solid formation mixes with soil, after making mixing, in soil, every pollutant index meets standard of soil environment quality requirement.
The ratio that described mud solid formation and soil carry out mixing is soil: mud is 2: 1 ~ 6: 1.
Described plant-microorganism combined remediation technology, plant and the rhizospheric microflora of soil system that coexists is utilized to purify organic and inorganic pollution in soil, namely the mycorrhizal fungi in plant roots district and plant form synbiosis, and have unique enzymatic pathway, in order to the organic matter that can not be transformed separately by bacterium of degrading; Plant root exudation have stimulated the transformation of bacterium; Plant also can be microorganism and provides existence place and transferable oxidation, and the aerobic transformation in Shi Gen district can normally be carried out.
Described heavy metal-polluted soil determination techniques, adopts NY/T1613-2008 " atomic absorption method is cleared up in the backflow of soil quality determining heavy metals chloroazotic acid ", records wherein heavy metal Pb, Cu, Cd, Cr content; Adopt HJ557-2010 " solid waste Leaching leaching method horizontal vibration method " to extract leachate, record COD
cr, petroleum content.
Described plant growth situation observed and recorded, essential record plant germination rate and growing height, and when plant one section after date, harvesting, airing dry doubling pulverize.Mensuration clears up content of beary metal in sample, analyzes plant heavy metal absorptivity and land remediation situation.
Beneficial effect of the present invention:
The present invention successfully improves current domestic existing dumping mud treatment technology, adopts chemical method to realize having carried out stabilisation to the pollutant in waste mud; Adopt chemistry and biological method that waste drilling fluid soil process is being reached soil environment quality secondary standard; Avoid in discarded slurry solidification processing procedure, the problem of land occupation resource; Solve solidified slip to increase in time, the environmental risk of pollutant seepage.There is the advantage that treatment process is simple, practical, possess large-scale application compared with domestic prior art.Therefore, the present invention has novelty, creativeness and advanced, and very high actual application value.
Accompanying drawing explanation
Fig. 1 is techniqueflow chart of the present invention.
Detailed description of the invention
As shown in Figure 1, waste water-base drilling liquid solid formation land resource technology, comprises the chemical solid-liquid separation technique of waste drilling mud, parting liquid pollutant analysis technology, parting liquid solid-phase contaminants analytical technology, waste drilling mud soil technology, Soil Quality Indexes analytical technology and plant growth situation observed and recorded.
First conventional parameter mensuration is carried out to waste drilling mud, comprise waste drilling mud moisture determination, waste drilling mud gravity test, waste drilling mud leachate preparation with waste drilling mud leachate suspended matter determination, four kinds of conventional parameter assay methods as follows listed by:
1, waste drilling mud moisture determination, its method step: (1) claims about 10g sample (being accurate to 0.01g), insert in the aluminium box of known weight, put into baking oven, dry at 105 ~ 110 DEG C of temperature to constant weight (about 6h), after taking-up, put into drier cooling; (2) in drier, take out aluminium box, weigh, be accurate to 0.01g.; (3) computing formula:
In formula: W-moisture content (%);
G
0-aluminium box heavy (g);
G
1-aluminium box+wet sample heavy (g);
G
2-aluminium box+oven dry sample heavy (g).
2, waste drilling mud gravity test, its method step: (1) takes the former mud sample of certain mass M, puts into and known volume V is housed
1water graduated cylinder in, read and to add after sample liquid volume V in graduated cylinder
2; (2) computing formula:
P=M/(V
2-V
1)(2)
In formula: ρ-mud balance (g/L);
M-quality of mud fluid (g);
V
1-graduated cylinder inner volume (L);
V
2-mud and water volume (L).
3, waste drilling mud leachate preparation, mainly in conjunction with mud feature and with reference to HJ557-2010 " solid waste Leaching leaching method horizontal vibration method ", the mud leachate preparation method obtained.Its method step: (1) accurately measures the tool plug conical flask that two parts of 50ml or 100g waste drilling mud samples are placed in 2L respectively, then respectively adds deionization pure water according to liquid-solid ratio 10: 1 ratio; (2) tool plug conical flask is vertically fixed on reciprocating horizontal oscillator, regulates that oscillator frequency is 110 ± 10 times/min, amplitude is 40mm, take off conical flask after at room temperature shaking 8h, leave standstill 16h; (3) filter the upper liquid (adopt suction filtration mode, filter sizes is 0.45 μm) in tool plug conical flask, namely obtain waste drilling mud leachate.
4, waste drilling mud leachate suspended matter determination method, its method step: (1) measures the sample 100ml suction filtration fully mixed, make moisture all by filter membrane, then with each 10ml distilled water continuous washing three times, continue suction strainer to remove traces of moisture.After stopping suction filtration, carefully take out the filter membrane being loaded with suspension and be placed in the measuring cup of former constant weight, move into and move in drier after drying 1h in baking oven at 103 ~ 105 DEG C, make to be cooled to room temperature, claim its weight.Repeatedly dry, cool, weigh, till the weight difference < 0.4mg of twice weighing; (2) computing formula:
C=(A-B)*106/V(3)
In formula: concentration of suspension (mg/L) in C-water;
A-suspension+filter membrane+measuring cup weight (g);
B-filter membrane+measuring cup weight (g);
V-volume of sample (ml).
According to the conventional parameter of surveyed waste drilling mud, carry out the chemical Separation of Solid and Liquid that waste drilling mud breaks glue, flocculation, its method step: (1) regulates discarded slurry concentration; (2) a certain amount of gel breaker being configured to solution is added, with 100r/min speed rapid stirring 5min, after leaving standstill broken glue 1h; (3) a certain amount of PAC is added, with 50r/min speed low rate mixing 5min; (4) add PAM solution again after stirring, with 50r/min speed low rate mixing until the mud in beaker forms comparatively big flocculating body, after leaving standstill 30min, move into centrifuge, adopt the centrifugal 10min of rotating speed of 3000r/min, obtain Separation of Solid and Liquid phase.
The discarded slurry density after concentration is regulated to be 1.2 ~ 1.3g/ml in practical operation.
Best gel breaker during process waste drilling mud is HGDJ-1, and dosage is 1.8 ~ 3g/ mud 100ml, broken glue time 30min.
Optimum flocculent during process waste drilling mud is PAC and PAM, and its consumption is respectively 1.2 ~ 2.4g/ mud 100ml, 0.01 ~ 0.05g/ mud 100ml.
After Separation of Solid and Liquid, the pollutant of parting liquid is analyzed, main employing extension rate method, dichromate titration, glass electrode method, silver nitrate titration method, AAS, gravimetric method, atomic absorption spectrophotometry and flame atomic absorption method, respectively to the colourity in parting liquid, COD
cr, pH, Cl
-, oil content, suspension, lead and copper measures, with evaluating chemical method to mud solid-liquid separation effect.
Then analyze parting liquid solid-phase contaminants, parting liquid solid-phase contaminants extracting method adopts HJ557-2010 " solid waste Leaching leaching method horizontal vibration method ", and the Cl in Detection and Extraction thing
-, Pb, Cu, Cd, Cr, COD
cr, petroleum content, obtain the ratio that mud solid formation mixes with soil, after making mixing, in soil, every pollutant index meets standard of soil environment quality requirement.
The ratio that in Practical Project, mud solid formation and soil carry out mixing is soil: mud is 2: 1 ~ 6: 1.
Conventional soil with through coagulation, filter the waste drilling mud solid portion obtained and mix in proportion, fully after mixing can in soil planting plants, before plantation, the vegetable seeds that will plant is soaked a few hours in water, is beneficial to germination.
Get sample segment airing 2 days in the sun again.In comminution and tack-free after the mud block finger kneading of airing, show that the mud moisture content after airing is very low, and the foreign material such as crushed stone, branch in soil good for airing are weeded out, pulverize with little shovel soil and use 10 object screen clothes to carry out sieving, pack carries out Soil Quality Indexes detection, the same method process of solid mud.
Heavy metal-polluted soil determination techniques, adopts NY/T1613-2008 " atomic absorption method is cleared up in the backflow of soil quality determining heavy metals chloroazotic acid ", records wherein heavy metal Pb, Cu, Cd, Cr content; Adopt HJ557-2010 " solid waste Leaching leaching method horizontal vibration method " to extract leachate, record COD
cr, petroleum content.
Chloroazotic acid backflow is cleared up NY/T1613-2008 and is extracted heavy metal-polluted soil method: (1) accurately takes the pedotheque of about 1g (being accurate to 0.0001g) by 0.149mm aperture sieve, add a little distilled water and soak soil sample, add 3 ~ 4 little beades; Add 10ml salpeter solution, infiltrate whole sample, electric hot plate heats under slight boiling condition 20min (in nitric acid and soil organic matter react after remainder about 6 ~ 7ml, add 20ml hydrochloric acid with next step and still approximately keep chloroazotic acid ratio); Add 20ml hydrochloric acid, cover surface plate, be placed on electric hot plate and heat 2h, keep chloroazotic acid to be in obvious slight boiling condition; Remove surface plate, catch up with whole acid solution matter wet salt state, add the water-soluble solution of 10ml, be filtered hot to constant volume in 50ml volumetric flask.
Plant growth situation observe, essential record plant germination rate and growing height, and when plant one section after date, harvesting, airing dry doubling pulverize.Mensuration clears up content of beary metal in sample, analyzes plant heavy metal absorptivity and land remediation situation.
After the growth in one period, harvesting, airing dry doubling are pulverized.Mensuration clears up content of beary metal in sample, analyzes plant heavy metal absorptivity.GB/T5009.12-2003 Ashing auxiliary method is adopted to clear up plant: (1) takes and dries plant sample 1.0g ~ 5.0g in porcelain crucible, add the pure nitric acid of 1ml ~ 2ml top grade, soak more than 1h, crucible is placed on adjustable electric furnace, careful evaporate to dryness, charing is not to smoldering; (2) be transferred in high temperature furnace, 550 DEG C of constant temperature 2h, after taking-up, cooling, addend drips in the sample ash of red fuming nitric acid (RFNA) in crucible, then proceeds in 550 DEG C of high temperature furnaces, continues ashing 1h ~ 2h, becomes lime shape to sample; (3), after taking-up lets cool from high temperature furnace, with red fuming nitric acid (RFNA) (volume fraction is 1%) dissolved samples ash, solution is quantitatively moved in 5ml or 10ml volumetric flask, fully mixes after constant volume, be test solution.Meanwhile, blank is done as stated above.
Embodiment 1
Water spinach potted plant experiment, before plantation, only in the plastic tub of Anti-seeping technology, the mud and soil mixture that volume is 5L is added, mud: soil ratio (volume ratio mixing) is 0: 1,1: 1,1: 2,1: 4,1: 6, and each proportioning is parallel does two parts every.The water spinach seed of plantation, through selecting, abandons seed less, not full for wherein particle.Then in the beaker of filled with water, soak 5h, in every basin, plant 100 water spinach seeds.During plantation, 100 water spinach seeds are spread on soil layer uniformly, cover about 2cm soil sample again, evenly water gently then.
Water spinach seed germination needs control temperature to remain on more than 15 DEG C, and thermophilic is 25 ~ 30 DEG C, and 2d waters once, makes soil moisture content reach 60%, regularly loosens the soil to prevent from hardening to upper layer of soil.
Water spinach initial planting is observed and records germination situation every day, periodic measurement plant strain growth height.The anomaly that growth course occurs, timely record analysis reason.Observe the situation of sprouting after water spinach first bud germinating time, 7d, germination cycle, relative germination rate, record the results are shown in Table 1.
Table 1 discarded slurry germinates and growth effect to water spinach
As can be seen from Table 1: the solid formation after (1) dumping mud treatment has obvious adverse effect to water spinach germination; (2) be extended because mud adds the germination cycle, illustrate that heavy metal in mud and organic pollution have inhibitory action to water spinach seed development.
Measured by the regular growing height to water spinach, obtain mud addition and water spinach growing height has close ties.Therefore, as long as mud and soil mixed proportion control in the reasonable scope, land treatment systems waste drilling mud can be utilized, water spinach output can not be made again to reduce.
After plantation, leaf through to soil in basin, water spinach well developed root system is stretched over every nook and cranny in basin, and soil is firmly fixed.Due to root system of plant and Soil Microorganism effect, soil color becomes dark than before plantation.Simultaneously due to root system effect, the water-holding capacity of soil obviously strengthens.
Gather the soil sample after plantation, soil sample is put and spreads out on the plastic film, natural air drying, pick foreign material, grind in quartzy mortar, for subsequent use through 100 order nylon mesh.Following table 2 be the results are shown in pollutant analysis in soil sample:
Soil root system analysis result mg/kg after the plantation of table 4-3 water spinach
As shown in Table 2, (1) content of beary metal after plantation in soil sample has decline in various degree.Due to, water spinach is different to different heavy metal tolerance degree, and therefore the purifying rate of heavy metal also has gap, wherein lower to the purifying rate of Cd; (2) in soil sample, CODcr declines obviously, and after water spinach plantation is described, soil process to the organic pollution purification in mud obviously; (3) oil content in the drilling mud of land treatment systems also in decline, shows that water spinach and Soil Microorganism also have to petroleum-type catharsis of degrading very well.
After the plantation of 50 days, gather in water spinach, airing dry doubling is pulverized.Clear up plant, the sample metal assay after clearing up heavily the results are shown in following table 3.
Analysis of Heavy Metal result mg in table 3 water spinach plant
As shown in Table 3: in (1) mud and soil mixed system, more than 90% of heavy metal reduction is because water spinach is to its absorption.(2) water spinach keeps same level substantially to a same heavy metal yield, illustrates that higher concentration heavy metal soil can not cause heavy metal in water spinach to increase.(3) when mud: after soil reaches 1: 4, in mud, pollutant is little on plant growth impact; (4) COD in drilling mud and petroleum-type all have at the better degradation effect of soil, can not affect water spinach and corn growth; (5) discarded slurry is planted after mixing with soil after treatment, can change into land resource, reduces solidification process to appropriation of land.
Embodiment 2
Corn potted plant experiment, before plantation, only in the plastic tub of Anti-seeping technology, add the mud and soil mixture that volume is 5L every, mud is respectively 0: 1,1: 1,1: 2,1: 4,1: 6 with soil ratio (volume ratio mixes), and each proportioning is parallel does two parts.The water spinach seed of plantation, through selecting, abandons seed less, not full for wherein particle.Then in the beaker of filled with water, soak 5h, in every basin, in basin, plant 50 corn seeds.During plantation, 50 seeds are spread on soil layer uniformly, cover about 4cm soil sample then again, evenly water gently.
The optimum temperature of corn seed germination is 25 ~ 30 DEG C, and 2d waters a water, makes soil moisture content reach more than 60%, regularly loosens the soil to prevent from hardening to upper layer of soil.
Every day at corn planting initial stage observes and records germination situation, periodic measurement plant strain growth height.The anomaly that growth course occurs, timely record analysis reason.Observe the situation of sprouting after corn seed first bud germinating time and 7d, experimental result sees the following form 4.
Table 4 discarded slurry is to corn germination and growth effect
Can be obtained by table 4: the solid phase after (1) dumping mud treatment has corn seed germination significantly to be affected, along with mud adds and the increase of ratio, germination percentage reduces gradually; (2), when in soil, mud addition is large, heavy metal wherein and organic pollution are grown corn seed comparatively high inhibition effect.
In mud, pollutant inhibits the biologically active of corn seed, causes sprouting time and germination cycle to be extended.Corn has certain tolerance degree to pollutant in mud simultaneously, as long as control mud and soil adding proportion well, both can utilize land treatment systems waste drilling mud, again can not excessive influence corn growth.
After plantation, leaf through to soil in basin, due to root system of plant and Soil Microorganism effect, soil color has had obvious improvement than before plantation.Simultaneously due to root system effect, soil water storage ability strengthens.
Gather the soil sample after plantation, soil sample is put and spreads out on the plastic film, natural air drying, pick foreign material, grind in quartzy mortar, for subsequent use through 100 order nylon mesh.Following table 5 be the results are shown in pollutant analysis in soil sample.
Soil root system analysis result mg/kg after table 5 corn planting
As shown in Table 5: (1) content of beary metal after plantation in soil sample has decline in various degree.Due to, corn is different to different heavy metal tolerance degree, and therefore the purifying rate of heavy metal also has gap, wherein better to the clean-up effect of Cu; (2) same heavy metal is after plantation, and the amount of minimizing is close, illustrates that corn is close to its absorptivity, does not change, illustrate that corn absorbs the needs of mainly nutrition to it because of its change in concentration, but not excess accumulation; (3) after plantation, in soil sample, CODcr declines obviously, illustrates that soil process to the organic pollution purification in mud obviously; (4) oil content in the drilling mud of land treatment systems also in decline, shows that in Plants and Soils, microorganism also has to petroleum-type catharsis of degrading very well.
After the plantation of 60 days, gather in milpa, airing dry doubling is pulverized.Clear up plant, the sample determining heavy metals after clearing up the results are shown in following table 6.
Analysis of Heavy Metal result mg in table 6 milpa
As shown in Table 6: in (1) mud and soil mixed system, more than 91% of heavy metal reduction is because corn is to its absorption; (2) corn keeps same level substantially to a same heavy metal yield; (3), in mud and soil mixed system, more than 90% of heavy metal reduction is because plant is to its absorption; (4) when mud: after soil reaches 1: 4, in mud, pollutant is little on plant growth impact; (5) COD in drilling mud and petroleum-type all have at the better degradation effect of soil, can not affect water spinach and corn growth; (6) discarded slurry is planted after mixing with soil after treatment, can change into land resource, reduces solidification process to appropriation of land.