286 results about "Anaerobic wastewater treatment" patented technology

The invention relates to the technical field of wastewater treatment and particularly discloses a treatment method of organic wastewater. The treatment method comprises steps as follows: the organic wastewater and ozone enter a reactor for a reaction, and the reactor is sequentially filled with a catalyst A and a catalyst B according to the contact sequence with the organic wastewater. The methodadopts a simple process, is good in stability and high in COD removal capability and can solve the problem about metal loss.

Complete equipment for stainless steel pickling wastewater treatment and resource recycling and a treatment process are disclosed. A pretreatment section, a membrane treatment section and a quality-based crystallization section are involved. The invention is characterized in that a storage regulating basin, a neutralization-oxidation reaction tank, a flocculent precipitation tank, a filter, an ultrafiltration and reverse osmosis system, a membrane concentration system and an evaporation and concentration and quality-based crystallization system are mutually connected end to end through pipelines. Each dosage device is respectively arranged on corresponding section. According to the order of the pretreatment section, the membrane treatment section and the quality-based crystallization section, thirteen steps are included for the operation. By the treatment process of chemical reactive precipitation, membrane separation concentration and evaporation and quality-based crystallization, various acid wastewaters mainly containing acid and inorganic salt can be treated to realize recycling of wastewater. After crystallization of salt, sodium sulfate (and sodium chloride), sodium nitrate, sodium fluoride and other products can be recycled, and zero-discharge resource utilization of stainless steel pickling wastewater is realized. Meanwhile, system sludge yield is greatly reduced such that the burden of sludge treatment is decreased.

A wastewater treatment apparatus (1) of the present invention is provided with: an oxidation treatment means (20) for oxidizing a metal complex-forming compound contained in wastewater (W0) that contains at least a heavy metal and the metal complex-forming compound; an insolubilization treatment means (30) for insolubilizing the heavy metal in the oxidized wastewater (W0); and a membrane separation means (40) for separating the insolubilized wastewater (W0) through a membrane. In addition, a wastewater treatment method of the present invention uses the above-described wastewater treatment apparatus. The present invention is capable of providing a wastewater treatment apparatus, a wastewater treatment method and a wastewater treatment system, each of which is capable of highly treating wastewater that contains a heavy metal and a metal complex-forming compound without adding a flocculant to the wastewater, and each of which is capable of sufficiently decreasing the heavy metal concentration.

The invention relates to the technical field of water paint wastewater treatment, in particular to a water paint production wastewater retreatment method. The method includes: step one, adding wastewater into a wastewater settling tank, adding polyaluminium chloride which is 0.1-0.3%. of the wastewater in weight, and starting an air pump for blowing and mixing for 20-40 minutes; and step two, after floating particulate matters in the wastewater are stable, slowly adding polyacrylamide solution with the weight being 0.25-0.75% of that of the wastewater and the concentration being 0.5-1.5%. to enable the floating particulate matters in the wastewater to be completely flocculated and the water to be clear. The wastewater is subjected to chemical flocculating settling, mechanical filtering and disinfection and then reused for production after water quality is qualified, the separated sludge can be subjected to drying and grinding and then used for production of construction putty powder, and accordingly 'zero emission' in production of water paint is realized, loss of raw materials and additives is reduced while discharge of wastewater and waste residue is avoided, and sewage-free, harmless and environment-friendly production process is realized.

A method of treating wastewater using an anaerobic bioreactor which contains a “bio-nest” structure to retain the microbial content and improve digestion efficiency is disclosed. The bionest system results in a longer SRT, good sludge mixing, and reduced wash-out of sludge. The system is particularly useful for treatment of lipid rich wastewater such as dairy wastewater.

In a process for the treatment of wastewater containing carbonaceous and nitrogenous contaminants, wastewater is mixed with aerobic microorganisms capable of converting carbonaceous biological oxygen demand (CBOD) into carbon dioxide, water, and biological cell mass. Oxygen is supplied to the reaction mixture for supporting reduction of the CBOD by the aerobic microorganisms in the reaction mixture. To substantially prevent nitrification of the nitrogenous contaminants in the reaction mixture and avoid the cost of downstream denitrification, the hydraulic residence time of the nitrogenous contaminants in the reaction mixture is controlled by removing partially treated water with dissolved ammonia from the reaction mixture, while retaining the biological cell mass in the reaction mixture. This separates the nitrogen load from the carbon load and enables independent treatment of these contaminants. The ammonia is scrubbed from the partially treated water to create fully treated water which is disposed or returned to the reaction mixture.

The invention discloses a carbon fiber-based mine wastewater treatment system and a groundwater decontamination process. The mine wastewater treatment system comprises a falling water aeration tank, a dosing tank, a primary sedimentation tank and multiple stages of carbon fiber contact oxidation tanks which are connected in series, wherein the falling water aeration tank, the dosing tank, the primary sedimentation tank and the carbon fiber contact oxidation tanks are connected sequentially, the dosing tank is used for adding a pH adjusting agent, the water inlet of the first-stage carbon fiber contact oxidation tank is connected with the water outlet of the primary sedimentation tank, and is provided with a decanter, and the water outlet of the last-stage carbon fiber contact oxidation tank is connected with a river channel or ditches; and the carbon fiber contact oxidation tanks are also provided with sludge discharge pipes and gates, each stage of the carbon fiber contact oxidation tanks is provided with a carbon fiber water purification system, and biofilm and algae fields which are formed by the carbon fiber water purification systems have the functions of retention, adsorption, adhesion, bridging, flocculation, bio-oxidation and bio-enzyme catalytic oxidation of wastewater. Iron manganese oxide which is a product of carbon fiber purification and treatment of wastewater is adopted as a catalyst, the operation cost is low, the decontamination effect is good, and the system is suitable for treatment of large-scale mine wastewater and groundwater sewage.

The invention discloses a treatment method for acidic organic chemical wastewater with high COD (chemical oxygen demand) and high sulfate radical concentration, which mainly comprises the following steps: Ca(OH)2 pretreatment, anaerobic treatment, two-stage aerobic treatment, etc. After Ca(OH)2 pretreatment of the acidic organic chemical industry wastewater to remove most of sulfate radicals and H<+>, wastewater treatment microorganism main body and operation parameter factors are controlled so as to form an anaerobic wastewater treatment method with anaerobic bacteria being dominant and an aerobic aeration treatment method mainly using halophilic and haloduric aerobic microorganism treatment, and the anaerobic wastewater treatment method and the aerobic aeration treatment method are especially suitable for treating organic chemical industry wastewater with high COD, high sulfate radical concentration and low pH value.

The invention provides a biomineralization-based acidic mine wastewater treatment system which comprises a water inlet end, a regulation unit, a biological oxidation mineralization unit, a lime neutralization unit, a lime dissolution unit, a neutralization residue reflux unit and a water outlet end. After the pH value of the acidic mine wastewater is regulated to 3.0, the acidic mine wastewater sequentially enters the biological oxidation mineralization unit and the lime neutralization unit to be treated, thereby reaching the discharge standard. By using the system and method provided by the invention, Fe<2+> in the acidic mine wastewater system can be completely oxidated within 48-60 hours, and meanwhile, the synthetic quantity of the secondary iron minerals can be enhanced by 30-60%. Compared with the conventional lime neutralization technique, the lime consumption is reduced by 30-50%.

The invention discloses a coking wastewater treatment system and method. The method comprises the steps of preparing dominant bacteria and putting the dominant bacteria into a membrane bioreactor, wherein the membrane bioreactor comprises an aerobic activated sludge tank and a membrane separation tank. The method specifically comprises the following steps: (1) taking aerobic activated sludge out of a coking wastewater discharge port; (2) acclimating, separating and purifying the aerobic activated sludge obtained in the step (1), thereby obtaining the dominant bacteria; (3) putting the dominant bacteria obtained in the step (2) into an aerobic sludge tank to react; and (4) after the wastewater, which is subjected to degradation reaction, enters a membrane separation tank, carrying out sludge-water separation. The invention efficiently removes specific organic pollutants in the coking wastewater by using the active dominant bacteria, thereby achieving the goal of degrading organic pollutants in a simple, efficient and quick way, so that the wastewater can be discharged after reaching the standard.

A system and method integrating treatment of waste, polar Fats / Oils / Greases (FOG) with conventional anaerobic wastewater treatment facilities for biologically fueling digestion of solids in, and steady state production of methane from treated wastewater streams that includes a slipstream loop circulating warmed, actively digesting sludge from the base to the head of the anaerobic wastewater treatment facility, a conditioning tank with input screened by a rock trap, actively digesting sludge pumped from the slipstream loop into the tank via the rock trap, before and after FOG wastes are pumped from a hauler tank via a hose connecting to the rock trap into the conditioning tank and mixed with actively digesting sludge in the tank to produce a feedstock slurry rich in volatile fatty acids for injection at a metered rate back into the actively digesting sludge slipstream loop for introduction at the head of the anaerobic wastewater treatment facility.

The invention discloses a multistage anaerobic wastewater treatment method which comprises steps as follows: wastewater, of which the CODcr is 2000-20000 mg / L and the pH value is 6-10, is pumped in from the water inlet of a multistage anaerobic wastewater treatment device and mixed with granular sludge on the bottom of the multistage anaerobic wastewater treatment device; the water inlet flow is adjusted to control the hydraulic retention time to 1-5 days; and the wastewater treated by the multistage anaerobic wastewater treatment device is discharged via the water outlet. The fluidized bed structure anaerobic region of the multistage anaerobic wastewater treatment device is in a completely-mixed fluidized state in the starting stage, thereby reinforcing the mass transfer effect between the particle sludge and wastewater, enhancing the biochemical reaction rate, accelerating the sludge granulation progress and greatly shortening the reaction starting time; and in the operating stage, the internal and external circulations of sludge-water mixture are implemented, thereby effectively eliminating the problems of short flow and dead spots, reinforcing the mass transfer effect and greatly enhancing the removal capacity of organic substances.

The invention provides a salt-containing wastewater treatment system. The salt-containing wastewater treatment system comprises a clarification and softening unit, a membrane filtration unit, a cationic resin softening unit, a carbon dioxide removal unit, a first reverse osmosis unit, a chelate resin softening unit, a second reverse osmosis unit, a nanofiltration unit, a freezing crystallization unit and other treatment units. The invention further provides a salt-containing wastewater treatment method. According to the salt-containing wastewater treatment system and treatment method, salt-containing wastewater can be converted into products such as acid, alkali, mirabilite and the like required to be purchased from the outside in the water treatment process, mixed organic matter containing salt which cannot be used is not generated, scaling and sewage blocking due to reverse osmosis and nanofiltration can be greatly relieved, long-time, stable and reliable operation of the treatment system can be guaranteed, the wastewater treatment cost is reduced, the concentrated water can be completely treated in the system, no secondary pollution is caused, and zero discharge and resource utilization of the wastewater are realized.