CN1778911A

CN1778911A - Treatment of coking crude waste water

Info

Publication number: CN1778911A
Application number: CN 200510012910
Authority: CN
Inventors: 李文英; 徐英; 冯杰
Original assignee: Taiyuan University of Technology
Current assignee: Taiyuan University of Technology
Priority date: 2005-10-12
Filing date: 2005-10-12
Publication date: 2006-05-31

Abstract

The invention is about a method to dispose the coking raw wastewater by the Immobilized-Microbial-cell (IMC). First to culture and domesticate the nitrifier and the anaerobic acidifying bacteria, then to embed by the IMC technology, then to dispose the raw wastewater by the IMC particle and the A/O technology with removing the COD and the ammonia nitrogen. The process needs not the applied carbon source and the reflux device of the mixture and the sludge. So it cost low and has the high yield.

Description

A kind of method of handling coking crude waste water

Technical field

A kind of method of handling coking crude waste water of the present invention belongs to the industrial sewage treatment technology field, specifically is a kind of method of utilizing fixation of microbial cell (Immobilized-Microbial-cell is called for short IMC) to handle coking crude waste water.

Technical background

Coking chemical waste water is the waste water that the coke-oven plant is produced in coke refining, gas purification process, contain a large amount of poisonous and harmful hard-degraded substances, as organism such as phenolic compound, fatty compounds, heterogeneous ring compound and polycyclic aromatic hydrocarbonss, these materials are very big to environmental hazard, according to reports, most of heterocycles and aromatic hydrocarbons have variable and carinogenicity, therefore, coking chemical waste water is handled, be very important.

At present, China generally adopts traditional treating coking wastewater biologicallies such as A/O, but efficient is lower, can't effectively remove aromatic hydrocarbons and nitrogen-containing heterocycle compound in the coking chemical waste water, water outlet COD and ammonia nitrogen are difficult to qualified discharge simultaneously, therefore, be necessary to seek a kind of approach that can efficiently remove COD and ammonia nitrogen in the coking chemical waste water simultaneously.

In recent years, utilize fixation of microbial cell (Immobilized-Microbial-cell, abbreviation IMC) technical finesse waste water has become the research focus of field of waste water treatment, at present, utilize IMC technical finesse Study on wastewater, only limit to handle COD in the waste water or a certain index in the ammonia nitrogen, to remove simultaneously actual waste water particularly in the high concentrated organic wastewater method of COD and ammonia nitrogen do not appear in the newspapers, therefore, research and utilization IMC technology removes a kind of actual high concentrated organic wastewater simultaneously---and COD and ammonia nitrogen in the coking chemical waste water have very important theory and realistic meaning.

Summary of the invention

A kind of method purpose of handling coking crude waste water of the present invention is, solve the unfavorable technical problem of coking crude waste water treatment effect, a kind of IMC of utilization technical finesse coking crude waste water is provided, reach the purpose of COD and ammonia nitrogen in the effective elimination coking crude waste water simultaneously, make water outlet COD and ammonia nitrogen concentration meet the method for discharging standards.

A kind of method of handling coking crude waste water of the present invention is characterized in that, at first cultivate and tame nitrobacteria and anaerobic acidification bacterium, nitrobacteria and anaerobic acidification bacterium are fallen to adopting the embedding of IMC technology, immobilization, to tame IMC particle after the maturation then combines with A/O technology and handles coking crude waste water, remove COD and ammonia nitrogen in the waste water simultaneously, coking crude waste water is before through the IMC aerobic process, earlier through the pre-treatment of an IMC anaerobic acidification, remove a part of COD and organism by anaerobic pond, adopt the IMC aerobic process to handle coking crude waste water again, concrete processing method is, the substratum of nitrobacteria is formed: ammonium sulfate 1100～1300mg/l, sodium bicarbonate is 500～2500mg/l, the iron of 100～7500mg/l, magnesium, sodium, potassium trace element, pH are 7.5～8.5; The domestication of nitrobacteria: get certain aeration tank, coke-oven plant mud, be inoculated in the nitrobacteria enrichment medium after dilution, 18～35 ℃ of shaking table domestications, detect the consumption of ammonia nitrogen every day, progressively improve the concentration of nitrobacteria enrichment medium, in 3～6 cycles of nitrobacteria enrichment culture, amount to 21～42 days, be the embedding carrier with the PVAC polyvinylalcohol behind the pending effect stability, it is carried out embedded immobilization; The domestication of anaerobic acidification bacterium: mud is taken from certain coke-oven plant's second pond, after artificial prepared culture is cultivated 1～5d, add coke-oven plant's raw wastewater in the water inlet, COD concentration is 1100～1500mg/l, ammonia nitrogen concentration is 200～350mg/l, the preparation of IMC small spherical particles: at first thickened sludge (thickened sludge is 1: 2～2: 1 with the weight ratio of embedding medium solution)+0.1～4.8% gac is mixed with 8～12%PVA+0.5～3.0%SA, then splash into the pH value and be balling-up in 6.0～7.4 the boric acid, the diameter of balling-up is Φ=2～7mm, at last with standby behind the distilled water flushing; Immobilization anaerobic bacterium after the domestication maturation and using immobilized nitrifying bacteria bead are dropped into the A/O technical process, coking crude waste water is handled.

A kind of method of handling coking crude waste water of the present invention, its advantage is:

1. the inhomogeneity predominant bacteria has strengthened the treatment effect of IMC to COD and ammonia nitrogen in coke-oven plant's raw wastewater at the growing multiplication of immobilized spherule different zones.

2.IMC A/O process stabilizing, COD and ammonia nitrogen processing efficiency obviously are better than common biological activated sludge process, in process of the test, thalline loss, immobilized spherule fragmentation and microorganism deactivated phenomenon do not take place, system shows stronger shock-resistant ability, avoid phenomenon, the productive rate of the sludge loss that exists in the traditional activated sludge process system for handling and solid-liquid separation difficulty to improve, cost reduces, easy and simple to handle, have very strong technology and economic advantages.

3. be applicable to removing of COD and ammonia nitrogen pollutant in other high concentrated organic wastewater, as the municipal wastewater of weaving, dyeing waste water and some heavy contamination.

4. not additional carbon, no mixed-liquor return and mud reflux in the whole technological process reduce cost of investment; The phenomenon of no sludge loss and solid-liquid separation difficulty, productive rate height, easy and simple to handle have very strong technology and economic advantages.

Specific embodiments one:

When the concentration of polyvinyl alcohol (PVA) is 8%, the weight ratio of thickened sludge and embedding medium solution is 1: 2, sodium alginate (SA) and Powdered Activated Carbon addition are 0.5%, during crosslinking time 16h, formed IMC physical strength, elasticity are general, and the clearance of ammonia nitrogen in the coking crude waste water and COD is respectively 74.6% and 79.3%.

Specific embodiments two:

When the concentration of polyvinyl alcohol (PVA) is 12%, the weight ratio of thickened sludge and embedding medium solution is 2: 1, sodium alginate (SA) and Powdered Activated Carbon addition are respectively 3.0% and 2.5%, during crosslinking time 32h, formed IMC physical strength, elasticity are relatively poor, and the clearance of ammonia nitrogen in the coking crude waste water and COD is respectively 68.1% and 69.4%.

Specific embodiments three:

When the concentration of polyvinyl alcohol (PVA) is 10%, the weight ratio of thickened sludge and embedding medium solution is 1: 1, sodium alginate (SA) and Powdered Activated Carbon addition are respectively 1.0% and 4.8%, during crosslinking time 24h, formed IMC physical strength, elasticity are good, clearance to ammonia nitrogen in the coking crude waste water and COD is respectively 84.6% and 90.2%, and the concentration of water outlet COD and ammonia nitrogen has reached national GB8978-1996 emission standard (COD≤150mg/l; Ammonia nitrogen≤25mg/l).

Claims

1, a kind of method of handling coking crude waste water, it is characterized in that at first cultivating and taming nitrobacteria and anaerobic acidification bacterium, nitrobacteria and anaerobic acidification bacterium are fallen to adopting the embedding of IMC technology, immobilization, to tame IMC particle after the maturation then combines with A/O technology and handles coking crude waste water, remove COD and ammonia nitrogen in the waste water simultaneously, coking crude waste water is before through the IMC aerobic process, earlier through the pre-treatment of an IMC anaerobic acidification, remove a part of COD and organism by anaerobic pond, adopt the IMC aerobic process to handle coking crude waste water again, concrete processing method is, the substratum of nitrobacteria is formed: ammonium sulfate 1100～1300mg/l, sodium bicarbonate is 500～2500mg/l, the iron of 100～7500mg/l, magnesium, sodium, potassium trace element, pH are 7.5～8.5; The domestication of nitrobacteria: get certain aeration tank, coke-oven plant mud, be inoculated in the nitrobacteria enrichment medium after dilution, 18～35 ℃ of shaking table domestications, detect the consumption of ammonia nitrogen every day, progressively improve the concentration of nitrobacteria enrichment medium, in 3～6 cycles of nitrobacteria enrichment culture, amount to 21～42 days, be the embedding carrier with the PVAC polyvinylalcohol behind the pending effect stability, it is carried out embedded immobilization; The domestication of anaerobic acidification bacterium: mud is taken from certain coke-oven plant's second pond, after artificial prepared culture is cultivated 1～5d, add coke-oven plant's raw wastewater in the water inlet, COD concentration is 1100～1500mg/l, ammonia nitrogen concentration is 200～350mg/l, the preparation of IMC small spherical particles: at first be with weight ratio 1: 2～2: 1 thickened sludge and embedding medium solution+0.1～4.8% gac mixes with 8～12%PVA+0.5～3.0%SA, then splash into the pH value and be balling-up in 6.0～7.4 the boric acid, the diameter of balling-up is Φ=2～7mm, at last with standby behind the distilled water flushing; Immobilization anaerobic bacterium after the domestication maturation and using immobilized nitrifying bacteria bead are dropped into the A/O technical process, coking crude waste water is handled.