Introduction to system technology:


The wastewater containing oil and emulsion enters into the oily wastewater regulating pool first, in which the oil and water are separated by static sedimentation, and part of the floating oil floats on the liquid surface and flows out through the overflow port; the wastewater containing oil and emulsion is pumped into the pipeline filter and then into the circulating water tank; the emulsion is preheated to 40-50 ℃; the waste emulsion enters into the ceramic membrane host, and the material liquid circulates in the host; the concentrated liquid return valve is opened（ The opening degree is controlled by the pressure at the reflux side, and part of the emulsion flows back to the circulating water tank; the valve at the filtration side is opened, and the filtrate is sent to the SBR (biochemical treatment) system, and the filtrate volume is controlled by controlling the opening degree of the filtrate valve (to make the filtrate flow stable for a long time); when the concentration is about 5-10 times, the concentrated solution is pumped into the concentrated emulsion decomposition tank for static sedimentation separation and floating on the tank The oil is recycled, and the oil and water in the lower part are returned to the wastewater regulating pool.


2. Calculation of membrane area


According to the engineering experience and the above water quality parameters, the flux of waste emulsion and washing machine wastewater is designed to be 120L / m2 / h, the treatment time is (3 + 4.5) / 8 / 0.12 = 7.8m2, the flux of other oily wastewater is designed to be 200L / m2 / h, the membrane area is: 1.8 / 0.2 = 9m2, the total membrane area is 7.8 + 9 = 16.8m2. According to the component area and arrangement, the whole set of equipment is composed of four components in series and parallel, and the total area is 4.5 * 4 = 18 M2


3. Effluent index


The content of petroleum in permeate water is ≤ 10mg / L (the influence of emulsifier shall be deducted); SS of suspended matter is ≤ 10mg / L (national standard SS ≤ 70mg / L). Test method GB8979-1996


system parameter


1. Ultrafiltration device:


1. Processing capacity of ceramic membrane ultrafiltration equipment:


Meet the requirements of 3 m3 / 8h of waste emulsion, 4.5 m3 / 8h of washing machine wastewater and 1.8 m3 / h of other oily wastewater


2. Ceramic membrane ultrafiltration membrane area: 18m2


3. Operating pressure: 0.3-0.4mpa, operating temperature: 45-60 ℃ or normal temperature


4. Permeate effluent quality: oil content ≤ 10mg / L (excluding the influence of emulsifier) ss ≤ 30mg / L


5. Membrane tube material: Support / membrane Al2O3 / ZrO2


6. Circulating pump Moret q = 120 / h h h = 35 n = 18


7. The ultrafiltration device is composed of 4 membrane components in series and parallel. The casing material is stainless steel SS304, the channel aperture of membrane tube is 4mm, the membrane aperture is 50nm, and the total membrane is 19 * 4 = 76. The special sealing gasket for corrosion and temperature resistance is used for sealing


2. Emulsion lift pump


Stainless steel pump: q = 10m3 / h, H = 17m, 1 set


2) Water inlet and outlet valve and pipeline: butterfly valve DN65 4 steel pipes DN65 50m


3. Pickling tank


1) Volume about v = 1.03 SS304 stainless steel


2) Stainless steel net (sundries) is set at the dosing place


3) Medium: js-320 ceramic membrane cleaner concentration 3-5%


4) Set high level overflow port


4. Alkali washing tank


1) Volume about v = 1.03 made of 304 stainless steel


2) Set high level overflow port


5. Clean water tank:


1) Volume about v = 2m3 PP


6. Decomposition box:


1) Volume: About v = 2.5, made of 304 stainless steel


2) Indirect heating with steam to 90 ℃


3) Set high level overflow port


7. Floor area of equipment


L*W*H=4000*2500*3000