37results about How to "Reduce the cost of dosing" patented technology

The invention discloses a process for removing heavy metals from sludge of sewage treatment plants. The process comprises the following steps of: adding 0.5 to 30g of elemental sulfur in each litre of sludge in a bioleaching tank, respectively inoculating 1 to 5 percent of thiobacilli and 1 to 3 percent of acidophilus moulds in the bioleaching tank, carrying out aerated bioleaching on the obtained sludge for 2 to 6 days until the pH value of the obtained sludge in the bioleaching tank is less than 2, and pumping the sludge subjected to bioleaching treatment in a plate-and-frame filter press by using a pump to carry out filter press separation so as to obtain sludge from which heavy metal is removed and sewage containing the heavy metal; adding alkali into the sludge from which heavy metalis removed to neutralize the sludge and then transporting the sludge to a sludge composting plant for composting; adding alkali into the sewage containing the heavy metal until the pH value of the sewage is about 7, then putting the sewage into an electrolytic flocculation floatation device to carry out electrolytic flocculation and self-floatation treatments on the sewage, and after the obtainedliquid supernatant reaches the standard, draining the liquid supernatant; and pumping the flocculated scum of the pollutant in water into the plate-and-frame filter press for separation to obtain corresponding filter liquor and sludge, wherein the filter liquor is drained to a waste liquor recovery tank, and the sludge is transported to a hazardous waste disposal center for treatment. The processof the invention has the advantages of shortening the lixiviation period, improving the lixiviation efficiency and the variety of lixiviated heavy metal, ensuring the stability of removing heavy metal, and saving equipment investment.

The invention provides an optical rod kinetic energy chemical feeding device. An inlet pipeline of a chemical feeding pump is connected with a chemical feeding barrel, the inlet of the chemical feeding pump is provided with a one-way valve A, an outlet pipeline of the chemical feeding pump is connected to a pressure regulating valve, a one-way valve B is arranged at an outlet of the chemical feeding pump, the back side of the one-way valve B is provided with a pressure gauge A, an outlet pipeline of the pressure adjusting valve is connected to a well pipeline, the pressure gauge B is arrangedon the well pipeline, a one-way valve C, a one-way valve D, a discharging valve and a switching valve are sequentially arranged at the back side of an outlet of the pressure adjusting valve, and a reflux inlet pipeline of the pressure adjusting valve is connected to the top of a liquid lever meter. The optical rod kinetic energy chemical feeding device has the advantages that the kinetic energy ofan oil pumping machine is fully utilized to serve as motive power of the chemical feeding pump, addition of extra power equipment is not required, the device is easy to maintain, the organic cooperation between the device and a wellhead does not influence other operation of the wellhead, and the effect of reducing the chemical feeding cost can be achieved; the chemical feeding amount can be adjusted, and accurate medicine addition can be achieved without stopping operation of the well; the device is small in size, easy to install, less in maintenance demand and attractive in appearance.

A tannery wastewater pretreatment method comprises the following steps: (1), precipitating sulfur-containing wastewater, discharging supernatant after precipitation and dewatering sludge after precipitation; (2), carrying out chromium removal treatment on chromium-containing wastewater through an alkali precipitation method and discharging supernatant after precipitation; (3), carrying out precipitation treatment on other wastewater, discharging supernatant after precipitation and mixing sludge with comprehensive wastewater sludge generated in the step (4); (4), enabling effluents discharged in the step (1), (2) and (3) to enter an adjusting tank to be mixed into comprehensive wastewater, lifting the mixed wastewater to a coagulating precipitation tank after adjusting, and carrying out biochemical treatment on supernatant after precipitation. According to the invention, the SS pollution load in the pre-treated comprehensive wastewater is reduced by 95% or above, the COD pollution load in the pre-treated comprehensive wastewater is reduced by 70% or above, the total nitrogen load in the pre-treated comprehensive wastewater is reduced by 30% or above, the content of toxic and harmful substances such as sulfide and total chromium is effectively controlled, and the requirement for stable operation of subsequent biological treatment is met. The treatment effect is stable and the stable operation of a biological system is facilitated.

The invention discloses an oil sludge separating device. The oil sludge separating device comprises an oil sludge pond, a first pump body, a vibrating screen, a first storage tank, a second pump body, a centrifugal machine, a second storage tank and a third pump body which are communicated with one another in sequence. Oil sludge is fed into the vibrating screen from the oil sludge pond through the first pump body for primary separation. A solid-phase object after primary separation is conveyed out, a liquid-phase object after primary separation enters the first storage tank to be deposited, and the deposited liquid-phase object is fed into the centrifugal machine through the second pump body for secondary separation. A solid-phase object after secondary separation is conveyed out, and a liquid-phase object after secondary separation enters the second storage tank. A density tester is arranged in the second storage tank, and a qualified liquid-phase object detected by the density tester is conveyed through the third pump body. The oil sludge separating device provided by the invention can improve the separating efficiency.