CN1887737A - Fast culture process in anaerobic grain sludge - Google Patents

Abstract

The fast culture process of anaerobic granular sludge belongs to the field of bitanical waste water treating technology, and features that polyquaternary ammonium salt is thrown to reinforce the immobilization of anaerobes to form granular sludge fast. Throwing polyquaternary ammonium salt can reserve methane sarcina to speed the accumulation of methane sarcina, raise the methane producing activity of biological grain and shorten the granulating process. The present invention makes it possible to shorten the starting time of anaerobic reactor to 1-3 months. The polyquaternary ammonium salt as flocculant hard to biodegrade may be absorbed by microbes to form granular sludge with high active component content. The positively charged polyquaternary ammonium salt may be absorbed and adsorbed by negatively charged bacteria to create great amount of biological aggregate capable of strengthening the biological floc, so as to form compact granular sludge with excellent depositing performance.

Description

A kind of fast culture process of anaerobic grain sludge

Technical field

The fast culture process of a kind of anaerobic grain sludge of the present invention belongs to the biological wastewater treatment technology field.Specifically, be to adopt to add polyquaternium and come the technology of reinforced anaerobic microorganism self immobilization with quick formation granule sludge.

Technical background

The anaerobic waste water biologic treating technique is with less energy consumption, and surplus sludge volume is few, emission-free pollution, and reactor organic loading height, volume is little, can reduce special advantages such as initial cost and be subjected to extensive concern.New and effective anaerobic reactor all is to be principal character to form granule sludge.

Dispergated digested sludge is inoculated in the newly-built anaerobic reactor, make reactor progressively bring up to design loading from initial organic loading rate Orgenic Loading Rate-OLR, and in reactor, turn out the active height of capacity, the anaerobic grain sludge that settling property is good, this process is called the startup of reactor.Because the generation time of anaerobion is long, lower than rate of rise, mud increasess slowly, so anaerobic reactor is generally longer start time, needs 4～6 months at least, even more than 1 year.In actual engineering, toggle speed becomes the bottleneck of restriction high efficiency anaerobic reactor widespread use slowly.

Flocculation agent has strengthening effect to promote disperseing mud to form particle, but the dosing method of currently used flocculation agent kind and flocculation agent, to add dosage all uncertain, and the randomness of action effect is very big, uses to engineering and brings blindness and uncertainty; Also there is not at present to adopt the technology that polyquaternium promotes the mud quick particleization that adds.

The type of anaerobic grain sludge mainly contains two kinds: based on the A-type particle mud of sarcina methanica (Methanosarcina) with based on the B type particles mud of methanothrix sp.When formation was the A-type particle mud of dominant bacteria with the sarcina methanica in the reactor, it loaded high, and degradation of substrates speed is fast; And methanothrix sp can only utilize the acetate growth, and cell proliferation is slow, utilizes substrate reactions speed low.But, because sarcina methanica light specific gravity, particle diameter are little, run off with water outlet easily, in anaerobic reactor, be difficult for forming A-type particle mud, this is that the limited reactions device produces the internal cause that methane speed improves.In anaerobic reactor, cultivate selectively and develop sarcina methanica, and formation A-type particle mud, can in the anaerobic reactor of handling high concentrated organic wastewater, accelerate the conversion rate of acetate to methane, acidification rate has following significance greater than the root problem of methanation speed in the solution process operation:

The organic loading rate sarcina methanica of raising system is strong to the acetate metabolism ability, when acetic acid concentration during greater than 300mg/L, is 3～5 times of methanothrix sp to the speed of utilizing of acetate.Therefore A-type particle mud can be brought into play the high and physio-biochemical characteristics faster than rate of growth of substrate utilization speed under its high acetic acid concentration to greatest extent, shortens hydraulic detention time HRT, improves the organic loading rate OLR of system.

The reaction process sarcina methanica of hydrogen transference between quickening to plant, promotion anaerobic digester system is to utilize acetate, H ₂/ CO ₂Have a liking for hydrogen, have a liking for the acetic acid and methane producing bacterium, can reduce the hydrogen dividing potential drop in the growing environment, for the growth of producing the hydrogen acetogen creates conditions, quicken hydrogen transference between the kind in the anaerobic digestion process, finish organism fast and effectively to CH ₄+ CO ₂Conversion process.

The basicity demand is little, reduces the running cost sarcina methanica and can adapt to than the lower pH condition of the desired pH value of other methanogen scope, and its anti-acetate energy force rate methanothrix sp is big, can grow under high acetic acid concentration, can reduce the basicity dosage.

Summary of the invention

The purpose of the fast culture process of a kind of anaerobic grain sludge of the present invention is: proposing to form with the sarcina methanica in the anaerobic reactor is the process strategies of the granule sludge of dominant bacteria, thereby discloses the technology that a kind of polyquaternium reinforced anaerobic reactor starts fast.

The fast culture process of a kind of anaerobic grain sludge of the present invention; it is characterized in that it being that a kind of quick formation is the cultural method of the anaerobic grain sludge of dominant bacteria with the sarcina methanica; concrete processing method is: be granular sludge promotor with the polyquaternium; control OLR with chemical oxygen demand (COD) Chemical Oxygen Demand-COD clearance between the starting period; Fe, Co, Ni salt compounds are directly added in the reactor

Raw material:

Seed sludge: municipal sewage plant's digested sludge;

Substratum: with carbohydrate organic waste water is substratum;

Granular sludge promotor: polyquaternium;

Salt compounds: FeCl ₂, CoCl ₂And NiCl ₂

Condition:

I, the stirring of employing strength, mechanical stirring or waterpower alr mode;

II, employing dosing method at interval add polyquaternium in anaerobic reactor;

III, initial OLR adopt 0.5gCOD/ (Ld), are the timed interval that prerequisite determines to improve OLR with COD clearance ≮ 85%;

IV, directly add to Fe, Co, Ni salt compounds in the reactor;

V, height for reactor and diameter ratio H/D get 5～6 and are advisable.

The fast culture process advantage and the purposes of a kind of anaerobic grain sludge of the present invention:

Mud increasess slowly in I, the anaerobic reactor, and initial start stage mud runs off easily.Sarcina methanica light specific gravity, particle diameter are little, suspend easily and run off with water outlet.Add polyquaternium and be not only the effective technology measure that keeps sarcina methanica, accelerates the sarcina methanica accumulation; and for the methanogenesis activity that improves biological particles, shorten the granulating process and also brought into play active effect, start time of anaerobic reactor is shortened 1～3 month.

II, polyquaternium are the flocculation agents of difficult anaerobic biodegradation, can be absorbed activeconstituents height in the formed granule sludge by microorganism gradually after starting end.

III, because polyquaternium has positive charge, and the antibiont capacity of decomposition is strong, can create a large amount of bio aggregate by the effect of electrostatic attraction and adsorption bridging with the bacterial cell of charged load, strengthened the intensity of biological floe.The granule sludge degree of compactness height that forms, settling property is good.

Embodiment:

Embodiment 1:

Seed sludge adopts municipal sewage plant's digested sludge.

Adding polyquaternium is granular sludge promotor with the polyquaternium, and anaerobic reactor starts the back and adds polyquaternium with the dosing method that added once in per two days in reactor.Polyquaternium adds dosage with the estimation of sludge seeding amount, and both quality ratio is: polyquaternium/sludge quantity=1.6mg/g.

Substratum with carbohydrate waste water as substratum.

The initial OLR of control organic loading rate adopts 0.5gCOD/ (Ld), is the timed interval that prerequisite determines to improve OLR with COD clearance 85%, makes OLR be able to quick raising.

Alr mode and intensity adopt intermittently alr mode of strength, and stirring frequency is for stirring the every interval 1h of 5min/, and stirring intensity is that velocity slope square root G value is got 85s ^-1

Reactor configuration height for reactor and diameter ratio H/D get 5.

It is to keep the dominant important factor of sarcina methanica that micro-metals directly adds to Fe, Co, Ni salt compounds in the reactor, and micro-dosage is: Fe adopts 1mg/ (Ld); Co adopts 0.1mg/ (Ld); Ni adopts 0.2mg/ (Ld).

Embodiment 2:

Seed sludge adopts municipal sewage plant's digested sludge.

Adding polyquaternium is granular sludge promotor with the polyquaternium, and anaerobic reactor starts the back and adds polyquaternium with the dosing method that added once in per two days in reactor.Polyquaternium adds dosage with the estimation of sludge seeding amount, and both quality ratio is: polyquaternium/sludge quantity=3.2mg/g.

Substratum: with carbohydrate waste water is substratum.

The initial OLR of control organic loading rate adopts 0.5gCOD/ (Ld), is the timed interval that prerequisite determines to improve OLR with COD clearance 85%, makes OLR be able to quick raising.

Alr mode and intensity adopt the mechanical stirring mode, and stirring intensity is that velocity slope square root G value is got 85s ^-1

Reactor configuration height for reactor and diameter ratio H/D get 6.

Micro-metals directly adds to Fe, Co, Ni salt compounds in the reactor, and micro-dosage is: Fe adopts 1mg/ (Ld); Co adopts 0.1mg/ (Ld); Ni adopts 0.2mg/ (Ld).

Embodiment 3:

Seed sludge adopts municipal sewage plant's digested sludge.

Adding polyquaternium is granular sludge promotor with the polyquaternium, and anaerobic reactor starts the back and adds polyquaternium with the dosing method that added once in per two days in reactor.Polyquaternium adds dosage with the estimation of sludge seeding amount, and both quality ratio is: polyquaternium/sludge quantity=2mg/g.

Substratum is a substratum with carbohydrate waste water.

The initial OLR of control organic loading rate adopts 0.5gCOD/ (Ld), is the timed interval that prerequisite determines to improve OLR with COD clearance 85%, makes OLR be able to quick raising.

Alr mode and intensity adopt the waterpower alr mode, and stirring intensity is that velocity slope square root G value is got 85s ^-1

Reactor configuration height for reactor and diameter ratio H/D get 5.5.

Micro-metals directly adds to Fe, Co, Ni salt compounds in the reactor, and micro-dosage is: Fe adopts 1mg/ (Ld); Co adopts 0.1mg/ (Ld); Ni adopts 0.2mg/ (Ld).

Claims (1)

1, a kind of anaerobic grain sludge fast culture process, it is characterized in that it being that a kind of quick formation is the cultural method of the anaerobic grain sludge of dominant bacteria with the sarcina methanica, concrete processing method is: be granular sludge promotor with the polyquaternium, the solid state polyquaternium is mixed with the solution of 1% concentration, start the back at anaerobic reactor and add polyquaternium with the dosing method that added once in per two days in reactor, the quality ratio of polyquaternium and seed sludge is between 1.6～3.2mg/g; With chemical oxygen demand (COD) Chemical OxygenDemand-COD clearance control organic loading rate Orgenic Loading Rate-OLR, be stabilized in greater than 85% o'clock raising OLR between the starting period at the COD clearance; Fe, Co, Ni salt compounds are mixed with solution, directly add in the reactor,

Raw material:

Seed sludge: municipal sewage plant's digested sludge;

Substratum: with carbohydrate organic waste water as substratum;

Granular sludge promotor: polyquaternium;

Salt compounds: FeCl ₂, CoCl ₂And NiCl ₂

Condition:

I, the stirring of employing strength, mechanical stirring or waterpower alr mode;

II, employing dosing method at interval add polyquaternium in anaerobic reactor;

III, initial OLR adopt 0.5gCOD/ (Ld), are the timed interval that prerequisite determines to improve OLR with COD clearance ≮ 85%;

IV, directly add to Fe, Co, Ni salt compounds in the reactor;

V, height for reactor and diameter ratio H/D get 5～6 and are advisable.