364results about How to "Reduce ammonia nitrogen content" patented technology

The invention discloses a natural mineral adsorption filtration agent, which comprises acidified zeolite, acidified attapulgite clay, acidified bentonite, acidified kieselguhr, volcanic rock and high-alumina clay. The preparation method of filtration agent is mixing, disintegrating, screening and packaging raw material to finished product. The filtration agent particles have rough surface, a lot of micropore inside, light specific gravity, large specific surface area and good adsorption capability, and are main raw material for preparing forming filtration material such as filtration plate, filtration block, filtration core, filtration pottery slice and filtration ring.

The invention discloses a system and a method for softening treatment of desulfurization wastewater of a coal-fired power plant. A primary reaction tank, a primary clarification tank, a secondary reaction tank and a secondary clarification tank are arranged, lime milk, sodium sulfate, polymeric ferric sulfate and polyacrylamide are added to the primary reaction tank for a primary reaction and clarified through the primary clarification tank, Mg(OH)2 and CaSO4*2H2O in the wastewater after the primary reaction are removed, the mixture has a secondary reaction in the secondary reaction tank, smoke is fed into the secondary reaction tank and is settled in the secondary clarification tank, CaCO3 is settled, and softening treatment of the desulfurization wastewater of the coal-fired power plant is completed. The system is simple in structure and easy to implement and facilitates industrial production; when the softening treatment effect is met, that is, the content of Mg<2+> is smaller than or equal to 5 mg / L and the content of Ca<2+> is smaller than or equal to 5 mg / L, the adding amount of chemical is reduced, and the chemical operation cost is reduced, so that the operation cost of a zero discharging system for the desulfurization wastewater of the coal-fired power plant is reduced, and the system has important economic benefits and environmental benefits.

The invention discloses efficient energy-saving coupling stripping deamination equipment and method. The equipment mainly comprises an I-effect evaporator, an II-effect evaporator, an inlet / outlet heat exchanger, a stripping deamination tower, an ammonia absorption tower and a circulation pump. The method comprises the following steps: heating the ammonia-nitrogen wastewater through the inlet / outlet heat exchanger and then feeding the heated ammonia-nitrogen wastewater into the stripping deamination tower; performing stripping deamination by utilizing circulating steam and fresh steam; feeding the ammonia steam contained in the top of the stripping deamination tower into the ammonia absorption tower by a steam circulator; absorbing the ammonia in the circulating steam by utilizing sulfuric acid to obtain ammonium sulfate solution; returning the purified steam to the stripping deamination tower for cyclic use; and feeding the ammonium sulfate solution to a double-effect evaporation section, and heating the ammonium sulfate solution by utilizing the fresh steam serving as a heat source for evaporation, obtaining solid ammonium sulfate, wherein the steam obtained by evaporating the ammonium sulfate solution in the II-effect evaporator is returned to a steam circulation efficient stripping deamination section by a steam conveyer and used as deamination steam. Through the invention, the wastewater with high ammonia nitrogen content can be treated, the ammonia nitrogen content in the discharged wastewater after treatment is low, and the steam consumption is low.

The invention provides a microbial preparation for improving freshwater aquaculture water body. The microbial preparation comprises the following raw materials by weight percentage: 25-30 wt% of bacillus subtilis, 25-30 wt% of bacillus licheniformis and 15-20 wt% of rhodopseudomonas palustris. The invention also provides a method for preparing the microbial preparation, which comprises the following steps of: sequentially inoculating the seed culture liquids of the bacillus subtilis, the bacillus licheniformis and the rhodopseudomonas palustris into a culture medium, fermenting to obtain a bacteria liquid, and mixing the obtained bacteria liquid with a carrier and nutrient substances to obtain the microbial preparation. The microbial preparation provided by the invention can significantly improve the water quality of the aquaculture water body and can also improve the meat quality of bred animals.

The invention discloses a covering material for immobilized in-situ remediation of nitrogen in bottom sediment and a preparation method of the covering material, belonging to the technical field of bottom sediment covering of surface water body. The covering material is the mixture of a powdery raw material and a binding agent, wherein relative to 1L of the binding agent constituting the covering material, the content of the powdery raw material is 1-2kg; the powdery raw material comprises the following components in parts by weight: 0-1 part of porous material, 0-8 parts of attapulgite clay and 6-30 parts of natural zeolite; the binding agent consists of an active material and an excitant; and relative to 1kg of the active material constituting the binding agent, the content of the excitant is 1-3L. According to the preparation method, the powdery raw material consists of natural materials such as zeolite, the binding agent consists of inorganic polymers, and the covering material is granulated and formed by an extruder and cured at room temperature. The covering material is a medium material with strong ion exchange capability and excellent biological load property and does not need to be sintered; and moreover, the covering material provided by the invention has the advantages of higher ammonium adsorption capability and lower cost as compared with the traditional materials.

The invention provides an aerobic denitrifying fungicide. The fungicide contains pseudomonas stutzeri and bacillus licheniformis. In addition, the invention also discloses a preparation method and applications of the aerobic denitrifying fungicide. According to the invention, the pseudomonas stutzeri is screened out from industrial wastewater produced by leather making, and finally identified as an original bacterium. In usual, people in the field believe that the pseudomonas stutzeri is an anaerobic denitrifying bacterium, the application confirms that the original bacterium also can be subjected to efficient denitrification under aerobic conditions, thereby widening the application scope of the pseudomonas stutzeri; and in addition, when the two kinds of denitrifying fungicides are conjunctively used, the denitrification efficiency under aerobic conditions can be greatly improved.

The invention provides a microecological bactericide for sustained release in water. The microecological bactericide is a bacillus subtilis microcapsule product and is mainly applied to aquaculture and environmental water purification. 2.0% of bacillus subtilis spores are taken as core materials, 0.8% of gelatin and 1.5% of sodium alginate are taken as composite wall materials, and 10% of calcium chloride is taken as a curing agent to prepare the microcapsule by adopting a piercing-solidifying method, wherein the encapsulated efficiency is above 87%, and the diameter of the microcapsule is 3-5mm. The product provided by the invention is applied to aquaculture, can play roles of purifying water and inhibiting pathogenic bacteria, and has a service cycle being more than 60 days.

The invention discloses an ammonia nitrogen-free leather-making deliming agent and a preparation method thereof. The method comprises the following steps of: mixing 60 to 80 mass parts of organic acid A, 15 to 30 mass parts of organic acid B and 5 to 30 mass parts of inorganic salt; and mechanically crushing until the granularity is 80 to 100 meshes, adding 1 to 10 mass parts of aids and uniformly mixing to obtain the ammonia nitrogen-free leather-making deliming agent. The deliming agent does not contain ammonia nitrogen materials, the ammonia nitrogen content of the waste liquid and chemical oxygen demand (COD) content after deliming are respectively reduced by over 80 percent and 20 percent compared with those of the conventional process, no irritant gas is generated in the deliming process, safety production of an operator is facilitated, and the deliming agent is a clean leather-making aid, and has great popularization and application prospect.

The invention provides a compound microorganism preparation used for freshwater aquiculture water body improvement, which comprises the raw materials by weight percentage: 25-30wt% of bacillus subtilis, 25-30wt% of bacillus amyloliquefaciens and 15-20wt% of thiobacillus denitrificans. The invention further provides a preparation method of the microorganism preparation, which comprises the steps that bacillus subtilis, bacillus amyloliquefaciens and thiobacillus denitrificans seed culture fluids are sequentially inoculated into a culture medium and fermented; an obtained bacterium fluid is mixed with a carrier and a nutritional substance; and the microorganism preparation is obtained. The microorganism preparation can obviously improve the water quality of an aquiculture water body, and can improve the meat quality of an aquiculture animal.

The invention relates to a composite heterotrophic nitrifying bacterial agent. The composite heterotrophic nitrifying bacterial agent is characterized by comprising pseudomonas CCTCC M 2011416, pseudomonas CCTCC M 2011417 and arthrobacter CCTCC M 2011418. The composite heterotrophic nitrifying bacterial agent also comprises domestication bacteria liquid. The invention also protects application ofthe composite heterotrophic nitrifying bacterial agent in nitrogen removal treatment of waste water containing ammonia and nitrogen, and the application is characterized in that: the composite heterotrophic nitrifying bacterial agent with an inoculation amount of 0.1 to 5% is inoculated into a water body containing ammonia and nitrogen; the number of live bacteria in the composite heterotrophic nitrifying bacterial agent is 109 to 1010 / mL; treating conditions are that temperature is 20 to 35 DEG C, pH is 6 to 9 and aeration time is 48 to 72 h. The composite heterotrophic nitrifying bacterial agent provided in the invention has strong ability in enduring waste water with a high concentration of ammonia and nitrogen, can be used for nitrogen removal treatment of waste water with a concentration of ammonia and nitrogen greater than 400 mg / L, has a high removal capability to waste water with a high concentration of ammonia and nitrogen, with a removal rate of ammonia and nitrogen being more than 99%, substantially reduces the content of ammonia and nitrogen in a water body and improves water quality.

The invention relates to an environment-friendly holothurian compound feed which is holothurian basal feed comprising algae powder, fish meal, bean pulp, sea mud, corn flour, shell powder, multi-vitamin and mineral substance, and is characterized in that the holothurian basal feed is added with 0.1% of phytase and cellulose as enzymic preparations; the holothurian basal feed is added with 0.1% of photosynthetic bacteria, ammonifying bacteria, nitrifying bacteria, denitrifying bacteria and nitrite bacteria as microbial preparations; and the holothurian basal feed is added with 2% of sodium alginate and 3% of cassava alpha- starch as auxiliary agents. Compared with the existing commodity holothurian feed, the stability of the environment-friendly holothurian compound feed in water is remarkably improved, the loss rate of nutrient components is remarkably reduced, influence for the water quality of the aquaculture is low, and the turbidity, the ammonia nitrogen content and the chemical oxygen demand (COD) value of the water are obviously reduced after baiting. Meanwhile, the preparation method and technique of the feed are simple, the cost is lower, large-scale production is easily carried out, and the environment-friendly holothurian compound feed has good popularization and application prospects in the holothurian production.

The invention discloses an ammonia nitrogen-removed compound microorganism microbial agent. The ammonia nitrogen-removed compound microorganism microbial agent is prepared from Providencia rettgeri, Microbacterium lactium, Lactobacillus delbrueckii and Rhodococcus coprophilus in a volume ratio of 5 to 2.5 to 1 to 5. The invention further discloses application of the compound microorganism microbial agent in ammonia nitrogen-containing wastewater treatment. The four bacteria are reasonably matched and are combined by virtue of an adsorption method and an embedding method to form immobilized cell particles, so that the ammonia-nitrogen degradation capacity and stability of the compound microorganism microbial agent are remarkably enhanced; a dominant bacterial community can be immediately formed after the compound microorganism microbial agent is applied to denitrification and treatment process of sewage, river way landscape water and the like, the treatment time is short, and ammonia and nitrogen indexes of the sewage are rapidly decreased; and meanwhile, the compound microorganism microbial agent has an aerobic denitrification function and further has relatively good effect of removing COD, and accumulation of nitrite and nitrate is avoided.

The invention discloses a method for preparing a water purification agent for degrading nitrite and ammoniacal nitrogen in an aquaculture water body. The method comprises the steps of: performing activated culture on Bacillus cereus on an activated liquid culture medium for two times to try to ensure that cells are at a synchronous growth stage, and then inoculating a working fermentation agent into an enriched medium according to the volume ratio of 1-10: 100 to culture for 24 to 48h under the condition that the temperature is between 25 and 40 DEG C and the rotating rate is between 150 and 200r / min to ensure that the viable count is over 1,014cfu / ml; or utilizing vacuum hot-air drying to ensure that the viable count reaches over 1,016cfu / g. The preparation has the ability of efficiently degrading nitrite, ammoniacal nitrogen and COD in a water body in freshwater and seawater aquaculture, and has good effect of clarifying the aquaculture water body.

The invention relates to a calcium peroxide preparation used for water fast oxygenation and a preparation method thereof which belong to the technical field of water quality treatment and are used for solving the problem that the prior calcium peroxide product has slow oxygenation effect and is not easy for applying. The technical proposal is as follows: the preparation is made from the raw materials with the weight portions as follows: 60 to 80 portions of calcium peroxide, 0.5 to 4 portions of adhesive, 10 to 20 portions of stabilizing agent, 0.2 to 2 portions of parting agent and 10 to 20 portions of exciting agent. The invention has the obvious advantages as follows: 1. the invention can increase the oxygen content of water fast, improve the water quality, eliminate pathogenicbacteria and deodorize; 2. the product can subside to the bottom of the water after being put into the water, increases the oxygen content of the water completely and also can disinfect the water from bottom to top; 3. the product has good stability and long shelf life and is not decomposed easily under normal state, the effective period can be more than one year; and 4. the invention has simple operation, is convenient for using and is safe and effective.

The invention relates to a method for treating fluorine-containing and ammonia nitrogen-containing waste water in electronic industry. The method comprises an ammonia nitrogen removal procedure and a fluorine removal procedure, wherein the ammonia nitrogen removal procedure is as follows: Cl2 is added into waste water, wherein 7.6-8.0mg of Cl2 is added into every one liter of waste water containing 1mg of ammonia nitrogen, and the Cl2 is added in two batches; the addition amount for the first batch is 65-75%, and the addition amount for the second batch is the rest; after the first batch of Cl2 is added, alkali equivalent to the added Cl2 for the first batch is added to neutralize hydrochloric acid produced by the reaction of the Cl2 and ammonia nitrogen, and then, the second batch of Cl2 is added; and the fluorine removal procedure combines chemical reaction precipitation and coagulative precipitation separation. By firstly removing ammonia nitrogen and then removing fluorine, the invention achieves the advantages of stable and favorable treatment effect, high efficiency and high speed. The fluorine ion content and ammonia nitrogen content in the waste water treated by the invention are effectively reduced, and the waste water can be discharged or be subjected to further reclamation treatment to be reclaimed according to different environmental protection requirements.

The invention discloses a biomass sea cucumber ecological breeding method which regularly puts the biomass into a pond during breeding up period of the sea cucumber breeding process in the pond. The original density of the biomass solution is 5-7 billion cells per ml. The biomass can degrade, absorb and convert such organic pollutants as residue baits, excrements and dead biological bodies, nitrogen and sulfur in the sea cucumber breeding environment, form advantage genus groups to effectively restrain growth and breeding of harmful micro-organisms and algae, reduce harmful contents of ammonia nitrogen, nitrous acid and hydrogen sulfide and promote the sea cucumber growth up. The invention has the advantages of convenient management, low breeding costs, high economic benefits, water body breeding optimization, low incidence rate of diseases and low death rate of the sea cucumber.

The invention discloses a V2O5-WO3 / TiO2powder for making a denitration catalyst, which comprises the following steps of: 1) making metatitanic acid into pulp at a concentration of 280 to 320g / L based on TiO2, heating the pulp to 60 DEG C, regulating the pH value to 5.0 with caustic soda, regulating the pH value to 5.5 to 5.7 with ammonia water, and filtering the pulp by pressure and washing the filter cake by water; 2) preparing an impregnation solution; 3) making the filter cake made by the step 1) into pulp at a concentration of 280 to 320g / L based on TiO2, heating to 60 DEG C, adding the pulp into the impregnation solution obtained by the step 2), stirring the mixture for 2 to 4 hours, and filtering the solution by pressure; 4) calcining the filter cake obtained by the step 3) at 400 to 550 DEG C for 2 to 5h; and 5) crushing the calcined material obtained by the step 4).

The invention provides a mechanical steam recompression falling film evaporation process method comprising the following specific steps: (1) high-salt wastewater pretreatment is carried out, wherein a material is delivered into a preheater through a feeding pump; condensate water of falling film evaporator secondary steam condensation is adopted as a heat source of the preheater, and the material is preheated; the preheated material is delivered into a liquid mixing device, and is mixed with liquid from an evaporation chamber of the falling film evaporator; and the mixture is delivered into the falling film evaporator; (2) a falling film evaporation system is established, wherein after the material enters the falling film evaporator, with indirect heating of evaporator shell-side steam, the material absorbs heat and the temperature is increased; the material enters the evaporation chamber; with the negative pressure in the evaporation chamber, the material is instantly evaporated, and most of water is converted into secondary steam and is discharged from a secondary steam outlet; and (3) a steam compression recycling system is established, wherein secondary steam from the evaporation chamber enters a steam compressor; with the compression of the steam compressor, steam pressure and temperature are both increased; and the steam is returned to the shell-side of the falling film evaporator again and is reused.

The invention relates to the field of preparation of rare earth, in particular to a herbaceous plant rare-earth precipitating agent and a preparation method thereof. The herbaceous plant rare-earth precipitating agent is prepared from, by weight, 30-50 parts of straw, 25-65 parts of fibrous stalks, 0.5-5 parts of herb for clearing away heat, 0.5-5 parts of Vitex.negundo L.var. cannabifolia (sieb. et Zucc.) Hand.-Mazz. herb and 0.08-5 parts of fungi, and the raw materials are weighed, smashed, fermented and soaked so that the herbaceous plant rare-earth precipitating agent can be prepared. By means of the herbaceous plant precipitating agent, the mother liquid precipitating effect can reach 99.6% or above after mineral leaching is performed on rare earth minerals in different types, the concentration of ammonia and nitrogen in supernatant after precipitation is 0.94 mg / L, secondary pollution of ammonia and nitrogen is avoided, herb precipitate contained in the supernatant can be directly used circularly, and the herbaceous plant rare-earth precipitating agent is a natural and environment-friendly precipitating agent.

The invention discloses a device for treating high-concentration ammonia-nitrogen wastewater in an aeration-anaerobic circulation mode. The device comprises an oxygenating column, a water inlet pump, a sludge reactor and a refluxing tank. An aerator is arranged at the bottom of the oxygenating column, a water distributing pipe is arranged at the bottom of the sludge reactor, oxygen-dissolved wastewater is pumped into the water distributing pipe through the water inlet pump, the refluxing tank is communicated with the oxygenating column, and gas generated by purifying the wastewater pushes the wastewater into the refluxing tank, the wastewater then flows into the oxygenating column to be oxygenated again, and circulating purifying is achieved. According to a wastewater treatment method, the oxygen dissolved in the denitriding process can only be supplied by oxygen dissolved in a water body, accurate supply control over electronic acceptors is achieved, it is guaranteed that ammonia nitrogen can only be converted into nitrite nitrogen, a proper environment is provided for smoothly carrying out the anaerobic ammonia oxidation process in the same reactor, the defect that an original anaerobic ammonia oxidation technology is quite prone to insufficient aeration or excessive aeration is overcome, the electronic acceptors are properly supplied in the denitriding process, and ammonia nitrogen in the wastewater is stably removed.

The invention provides a microbial preparation for improvement of a freshwater aquaculture water body. Raw materials of the microbial preparation comprise, by weight, 15-40% of bacillus subtilis, 15-40% of bacillus amyloliquefaciens and 10-20% of rhodopseudomonas palustris. The invention also provides a method for preparing the above microbial preparation, comprising the following steps: successively inoculating bacillus subtilis, bacillus amyloliquefaciens and rhodopseudomonas palustris to a medium, fermenting and mixing a fermented liquid obtained with a carrier and nutrients so as to obtain the microbial preparation. By the use of the microbial preparation provided by the invention, water quality of an aquaculture water body can obviously be improved, and meat quality of farmed animals also can be raised.

The invention discloses a purifying method for black and odorous water and sediment nutrient salt. The purifying method comprises the following steps: a) carrying out aeration treatment on the surface sediment and the overlying water of the black and odorous water to synchronously reduce the ammonia nitrogen contents of the water and the surface sediment, and meanwhile immobilizing the phosphorus in the water by adsorption; b) carrying out settling treatment on the water subjected to the aeration treatment; and c) repeatedly carrying out the treatments in the steps a) and b) on the water subjected to the settling treatment until the concentration of ammonia nitrogen in the water is lower than a predetermined concentration, keeping the water standing still, and finishing the purification of the water. According to the purifying method provided by the invention, the adding of a chemical agent is not needed, while all that is needed to do is change the position of an aerator on the basis of the traditional aeration to directly oxygenate and aerate the surface sediment, so that the oxido-reduction condition of the sullage-water interface of a black and odorous river channel is effectively improved while water reoxygenation is realized, an oxidizing layer with a certain thickness is formed, the ammonia nitrogen contents of the water and the surface sediment are synchronously reduced, and meanwhile the adsorption immobilization of the phosphorus in the water is realized. After being treated according to the method, the black and odorous water is improved in transparency and reduced in odor strength.

The invention discloses a kitchen wastewater treatment method which comprises the following steps: 1, chemical phosphorus removal is performed on kitchen wastewater flowing out from an IC (internal circulation) reactor; 2, after passing through a water quality equalization tank, the wastewater enters a CASS (Cyclic Activated Sludge System) to react, so that soluble substrates, organisms, phosphorus and an synchronous nitrification and denitrification effect are removed; 3, after the wastewater flows into an intermediate water tank to be subjected to volume regulation, the wastewater enters a Fenton oxidation reactor and an iron-carbon micro-electrolysis device so as to improve biodegradability of the wastewater; 4, after passing through the Fenton oxidation reactor and the iron-carbon micro-electrolysis device, the wastewater directly enters a hydrolysis acidification pool from the intermediate water tank, suspended matter and iron ions are removed and sludge is separated, hydrolyzed and acidified; 5, the wastewater is subjected to aerated oxidation to remove COD (Chemical Oxygen Demand) content; 6, the wastewater enters an MBR (Meane Biological Reactor) pool and hardly degradable substances are degraded, so that the drained wastewater reaches the take-over standard of a sewage treatment plant; 7, after the sludge discharged from a chemical phosphorus removal pool and the MBR pool is processed by a precision solid-liquid separator, solids are prepared into an organic fertilizer and filter-pressing liquid enters the water quality equalization tank.

The invention discloses a manufacturing technology for flame-retardant, anti-yellowing and low-fogging cowhide car seat cushion leather. The manufacturing technology comprises the production procedures that ammonium salt deliming is replaced by ammonium-salt-free deliming, the fogging value of the seat cushion leather is reduced through high-temperature washing, the flame-retardant property of the leather is improved through retanning, fat liquoring and coating step by step, and the light resistance of a coating is improved through a light-resistant material. According to the manufacturing technology, the usage quantity of leather chemicals is decreased by selecting roll coating to replace spray coating, a flame-retardant, low-fogging, light-resistant, heat-resistant, anti-yellowing and high-property car trim leather product is researched and developed, and a wide market prospect is achieved.

The present invention relates to a process method for industrial wastewater emission reduction and resource utilization, specifically to a method for resource utilization of ammonia nitrogen by using a heat pump rectification technology and a steam stripping deamination process. According to the present invention, the 1000-80000 mg / L of the ammonia nitrogen wastewater treated by the process of the present invention achieves the national first-class ammonia nitrogen emission standard, the ammonia in the wastewater can be recovered and utilized in the ammonia and ammonia water form, and the steam consumption of the deamination process is 25-50 kg / ton wastewater.

The invention provides a simple culture method of photosynthetic bacteria with a high cell concentration. The components of the culture medium of photosynthetic bacteria are simplified. The main components of the culture medium comprise the following steps: 0.3% of sodium acetate, 0.6% of sodium bicarbonate, 0.1% of NH4Cl, 0.1% of NaCl, 0.02% of MgSO4.7H2O, 0.05% of K2HPO4, 0.02% of KH2PO4, 0.005% of CaCl2 and 0.05% of yeast extract. The production process of photosynthetic bacteria is also simplified. The invention has the following advantages: the composition and components of the culture medium are optimized, and the production cost can be reduced under the premise of ensuring the concentration of a bacteria solution; the culture process of photosynthetic bacteria is simplified to ensure that the scale production of photosynthetic bacteria has high operability; and the required equipment is simple and culturists can produce photosynthetic bacteria at home so as to greatly reduce the use cost of photosynthetic bacteria. The photosynthetic bacteria produced by the method can be used to adjust the algal phase of a water body, effectively reduce the ammonia-nitrogen content and increase the content of dissolved oxygen in the water body.

The invention discloses a cleaning treatment process for cowhide, which orderly comprises process steps of soaking, liming, reliming, non-ammonium deliming softening and so on. The process is mainly characterized in that: soaking enzyme is mainly adopted in the step of the soaking, which greatly reduces the use level of a surfactant and the content of COD and BOD. Compared with the prior hair burning method, the liming and the reliming are characterized in that: a hair-saving liming process changes the process thought; the liming expansion is performed after hair saving and hair filtration, which reduces the content of ammonia nitrogen, the COD, the BOD and solid waste in wastewater. And waste liquid after the liming realizes recycling and achieves zero discharge. A non-ammonium deliming softening system is adopted, which reduces the content of the ammonia nitrogen in the wastewater. The use level and the discharge of sulfide and lime which are used to produce leather by the cowhide are reduced by 50 percent or so, an ammonium salt deliming process is saved, the content of the ammonia nitrogen is reduced by more than 90 percent, and the COD and suspended substances are reduced by more than 85 percent.

The invention provides a method for improving n-3 polyunsaturated fatty acid in the meat of grass carp. Cross bred Pennisetum alopecuroides are matched with a compound feed for fresh water fish sold in the market to feed the grass carps. The weight proportion of the dry matters matched with the compound feed and the cross bred Pennisetum alopecuroides is 1.1 to 1. The invention filtrates and discovers a certain plant which is rich in Alpha-linolenic acid, adds the plant with a certain proportion to feed phytophagy fish through scientific research and produces cheap fish meat which is rich in the n-3 polyunsaturated fatty acid through the biotransformation of the phytophagy fish.

The invention discloses an electrolytic manganese residue harmless treatment and resource utilization method. The electrolytic manganese residue harmless treatment and resource utilization method comprises the steps that firstly, a calcium oxide additive and a calcium carbonate additive are added into leaching liquid, and impurities such as iron, magnesium and calcium in the leaching liquid are effectively removed; secondly, the pH value of the leaching liquid is regulated through sodium hydroxide, sodium carbonate is added to react, and thus a manganese carbonate product is obtained; and finally, by adding calcium oxide, high-concentration ammonia nitrogen in filtrate is removed in an air stripping mode, escaping gas is absorbed through clear water, and the filtrate is reused. According to the electrolytic manganese residue harmless treatment and resource utilization method, the contents of heavy metal and the ammonia nitrogen in electrolytic manganese residues are effectively decreased, the manganese and ammonia nitrogen leaching time is shortened, and the leaching rates of manganese and the ammonia nitrogen in the electrolytic manganese residues are increased; and manganese in the leaching liquid is mainly recycled as manganese carbonate, a product can be directly used as electrolytic manganese residue raw materials, and in addition, the leaching liquid after a stripping reaction can be recycled.