Styrene-butadiene rubber increased by 7.71% from 13256 yuan / ton on October 8 to 14278 yuan / ton on October 15. It is not the first increase in styrene-butadiene rubber, and the specific reasons need to be analyzed by various gods.
Styrene-butadiene rubber generally refers to the copolymerized high-resolution bullet with butadiene and styrene as the main monomers. The production wastewater mainly comes from washing glue, separating water for recovering styrene, cleaning equipment water and cleaning ground water. Wastewater is mainly based on organic matter, including styrene, benzene, organic amines, etc., and also contains other phosphating salt substances. The resulting styrene-butadiene rubber wastewater is quite complex, the B/C ratio is low, the biodegradability is poor, etc., which is difficult to treat as high-concentration organic wastewater.
<h1 class="pgc-h-arrow-right" data-track="3" > primary treatment uses neutralization-grease trap-condensing air flotation. </h1>
1. Neutralize the pool
Styrene-butadiene rubber wastewater enters the neutralization pool, and then adds a pH adjuster to artificially control the pH, adjusts to about 4.5, and acidifies demulsifying.
2. Grease trap
Most of the use of advection type, oily wastewater through the water distribution tank into the plane of the rectangular grease trap, along the horizontal direction of slow flow, in the flow of oil products on the floating surface, by the oil collection pipe or scraper to remove the wastewater suspended solids and oil slicks. The precipitated heavy oil and other impurities accumulate into the sludge bucket at the bottom of the pool and enter the sludge pipe through the sludge pipe. SS, styrene, oil and other substances in the wastewater can be preliminarily removed.
3. Condensed air flotation tank
Under the action of the adjustment pool, the pH value is adjusted to neutral, and the condensed air flotation tank is entered by the action of the water pump, and the PAC and PAM are put into the flocculation reaction. The fine suspended solids in the water are flopped to form a precipitate, thus achieving the removal of most of the suspended solids and some organic pollutants. The wastewater enters the coagulated air flotation device, and the fine suspended solids and some organic pollutants are further removed by the method of air flotation. Further remove SS, styrene, oil and other substances in the wastewater.
<h1 class="pgc-h-arrow-right" data-track="20" > secondary treatment uses hydrolytic acidification-contact oxidation</h1>
1. Hydrolytic acidification
In the hydrolyzed acidification tank, the large molecule refractory biodegradable substances in the wastewater are hydrolyzed into small molecule substances that are easily biodegradable. The biochemical properties of the wastewater have been improved, while some OF the COD has been removed.
2. Contact oxidation
The bio-contact oxidation method is an immersion biofilm method, which is actually a complex of biological filters and aeration tanks. Unlike biological filters, the fillers in contact with the oxidation tank are various floating membrane media, all of which are immersed in wastewater. The organic matter in the water is adsorbed on the biofilm on the surface of the filler and decomposed by microorganisms. Like other biofilm methods, biofilms have undergone the process of film hanging, growth, thickening, and shedding. Part of the biofilm breaks off into activated sludge, and excess exfoliated biofilm is removed in the secondary sedimentation tank.
The above combination is a shared styrene-butadiene rubber wastewater treatment method, and the effluent quality effectively meets the requirements of discharge. The price of styrene-butadiene rubber is rising, do not let the wastewater problem become the reason for the rise in the price of styrene-butadiene rubber. Make good use of wastewater treatment processes, recycle water resources, and reduce costs.