Self-suspending microbial carrier for sewage treatment

The invention relates to a self-suspending microbial carrier for sewage treatment. The self-suspending microbial carrier comprises a net cylinder or a net tank having an opened end, a net cover capable of covering the net cylinder or the net tank and a filtration carrier material layer arranged inside the net cylinder and capable of adhering microorganisms, wherein the filtration carrier material layer comprises an upper filtration carrier material layer and a lower filtration carrier material layer; the specific gravity of the lower filtration carrier material layer is greater than that of the upper filtration carrier material layer, the height of the lower filtration carrier material layer is less than 1/2 of that of the net cylinder and the density of the microbial carrier is less than that of the sewage. By the self-suspending microbial carrier, the problems that the installation of the microbial carrier is complex and trouble, the affinity between the microorganisms and the filtration ...

Clay carrier for wastewater treatment and preparation method of clay carrier

The invention relates to a clay carrier for wastewater treatment and a preparation method of the clay carrier. The clay carrier is characterized by being prepared by the following steps: configuring the following raw materials in percentage by weight: 55-65 percent of foundry waste sand, 30-40 percent of loess and 4-6 percent of sewage sludge, mixing the raw materials, grinding, aging, forming, drying, sintering and screening to prepare a finished product. According to the preparation method disclosed by the invention, the clay carrier is prepared by virtue of the processes in an ageing stage, a forming stage, a drying stage and a sintering stage. According to the clay carrier and the preparation method disclosed by the invention, pollutants including the foundry waste sands and the sewage sludge are recycled and utilized; as the main component of the product is silicate, the clay carrier is neutral in water so as to be beneficial to attachment increment of microorganisms; and the raw materials ...

Ru-based ammonia synthesizing catalyst carried by nano carbon fiber and its prepn.

一种高比表面金属氧化物的制备方法

The invention relates to a method to prepare high specific surface metal oxides, like the Ce-containing solid solutions of CeO2, ZrO2, CexZr1-xO2, etc. Firstly, it loads metal combination or mixture of the metal combination onto the carbon material by dipping to obtain the fore body, where the carried quantity of the oxide is 1-200% of the weight of the carbon material; then, raises the temperature of the fore body to 450-950 deg.C at the atmosphere of air or 5-20vol.% oxygen at a heating speed of 1-20 deg.C/min, makes constant temperature oxidization for 0.1-10 hours and then lowers the temperature to room temperature, so as to obtain it.

Sewage recycling and purifying device

The invention provides a sewage recycling and purifying device, which relates to the field of sewage treatment and comprises a filtering assembly, a pressing assembly, a pushing assembly and a purifying assembly, the supporting assembly is mounted outside the mounting assembly; the sealing assembly is mounted in the mounting assembly; the filtering assembly is mounted in the sealing assembly; the pressing assembly is mounted at the top of the mounting assembly; the pushing assembly is mounted in the mounting assembly; the purification assembly is mounted on the left side of the mounting assembly; a one-way valve A is fixedly mounted in the sewage inlet pipe; the connecting pipe is fixedly mounted on the left side of the shell; a one-way valve B is fixedly mounted in the connecting pipe; when a pressing column moves upwards, a filter cover moves upwards, and the filter cover has an extrusion effect on sewage at the top, so that the sewage is conveniently discharged through a filter hole; ...

Domestic wastewater treatment method without need of repeatedly adding microbial strain and domestic wastewater treatment system using same

The invention relates to a domestic wastewater treatment method without need of repeatedly adding a microbial strain and a domestic wastewater treatment system using the method. The domestic wastewater treatment method comprises the following steps: separating impurities from wastewater; separating nitrogen and phosphor out of the wastewater; oxidizing and eliminating harmful substances such as nitrogen and phosphor by virtue of microbes; precipitating the impurities for the first time; filtering the microbes; precipitating the residual impurities for the second time; and finally obtaining the clean water. According to the process, the domestic wastewater treatment system comprises a water collecting tank, an anaerobic tank, a microbe contact tank, a sludge liquor separating tank I, a microbe filtering tank, a sludge liquor separating tank II, a disinfecting and exhausting tank which are connected in sequence, wherein an electrolysis unit is arranged in the anaerobic tank; a microbe contact ...

Process for preparing high specific surface area metal oxide

The high specific surface area metal oxide has the expression of MxO2 or MxM'1-xO2, where M and M' is different and one of Ce, Zr, Ti, Co, Fe, Ni and W, and has the specific surface area of 80-120 sq m/g. The preparation process of the high specific surface area metal oxide includes: soaking process to load the metal nitrate, oxalate, acetate, organic compound or mixed metal salt solution onto carbon material in the metal oxide loading amount of 5-40 wt%; heating the loaded sample in the temperature raising rate of 1-20 deg.c/min to 450-950 deg.c, maintaining to oxidize for 0.1-10 hr, and lowering to room temperature to obtain the corresponding metal oxide or solid solution with high specific surface area. The present invention may be used in three-purpose catalyst, CO and CH4 burning catalyst and fuel cell catalyst.

Ru-based ammonia synthesizing catalyst carried by nano carbon fiber and its prepn.

The high-effective aommonia synthesis catalyst is formed from carrier and active component, its carrier is carbon nano fibre, and metal ruthenium is used as active component, its loading quantity is 0.1-8 wt%, alkaline earth metal is used as adjuvant, the mole ratio of adjuvant and ruthenium is 0.01-10. Its preparation method includes: oxidative pretreatment of carbon nano fibre carrier, soaking carrier in ruthenium compound solution, under the condition of hydrogen atmosphere making reduction for 0.5-10 hr. at 200-500 deg.C, then impregnating with alkaline earth metal or oxide adjuvant. Under the condition of that reaction gas volume space velocity is 3000 hr (-1) and reaction pressure is 3.0 MPa its ammonia synthesis rate can be up to 430 ml/h. gcat at 400 deg.C.