The invention discloses a short-chain volatile fatty acid and a preparation method thereof. The preparation method for the short-chain volatile fatty acid comprises the following steps of employing sludge as a fermentation substrate; adding sodium nitrite into the fermentation substrate, performing pretreatment in an acid environment, and performing anaerobic fermentation under an alkaline condition to obtain the short-chain volatile fatty acid. According to the short-chain volatile fatty acid and the preparation method thereof, the sludge of a sewage treatment plant is taken as a raw material, and is jointly treated by virtue of free nitrite pretreatment and alkaline anaerobic fermentation, and the concentration of free nitrite in the system, the pretreatment time, the fermentation pH value and the action of microorganisms in the sludge are controlled to maximally convert undissolved sludge organic matters in the sludge into the short-chain volatile fatty acid, so that the yield of the volatile fatty acid produced from the sludge is further increased on the basis of resourcefully utilizing the sludge and reducing environmental pollution caused by the sludge, and the reaction time is shortened; the short-chain volatile fatty acid and the preparation method thereof have the advantages of high product yield, simple preparation method, energy conservation, consumption reduction, low running cost and the like.

Short-chain volatile fatty acid and preparation method thereof

The invention discloses an endogenous FNA pretreatment and sludge reduction and recycling process The process includes the following processes: 1) adding sludge into a pretreatment unit, and pretreating the sludge with FNA; 2) allowing the pretreated sludge to enter an acidogenic phase reactor, and carrying out hydrolysis acidification; and 3) allowing the sludge after hydrolysis acidification to enter a methanogenic phase reactor, and carrying out methanogenic digestion, and then discharging, wherein the FNA is synthesized by acidogenic phase and methanogenic phase digestion liquids The sludge pretreated by the FNA firstly enters an acidogenic phase and is utilized to produce an acid by acidogenic fermentation bacteria, and the hydrolysis acidification rate is improved; then, the hydrolysis-acidified sludge enters a methanogenic phase and is utilized by methanogenic bacteria to increase the methane yield; and finally the digested sludge is discharged by the methanogenic phase, and the sludge reduction and recycling are realized

Endogenous FNA pretreatment and sludge reduction and recycling process

The invention relates to the technical field of resource converting of organic solid wastes and particularly relates to a method for producing volatile fatty acid (VFA) from mushroom cultured residue through alkaline fermentation. The preparation method comprises the following steps: taking the mushroom cultured residue as a fermentation substrate, and taking anaerobically digested sludge as inoculating sludge; carrying out mechanical pulverization on dried mushroom cultured residue, adding distilled water into the powder so as to prepare a mixed solution with the solid content of 12% to 18%, mixing the mixed liquid with the inoculating sludge according to the volume ratio of 5: 1, and introducing nitrogen gas into the mixture for 3 to 5 minutes; controlling the reaction temperature to 35 DEG C and the stirring rate to 120r/min to 180r/min, maintaining the pH of a system to about 10, and carrying out alkaline fermentation on the mushroom cultured residue in an anaerobic environment for 4 to 7 days; carrying out centrifugation on the mixed solution obtained after the alkaline fermentation by adopting a centrifuge at the centrifugal speed of 12,000r/min, so as to obtain centrifugal supernatant, i.e. VFA fermentation liquor. According to the method, the technological operation is simple, anaerobic fermentation conditions are easily controlled, and the economic cost is low, so that the method has a good application prospect. The invention provides a novel method for solving the problem of stacking of the mushroom cultured residue and achieving the resource converting of agricultural wastes and has important significance.

Method for producing volatile fatty acid (VFA) from mushroom cultured residue through alkaline fermentation

The present invention discloses a method for producing a short-chain fatty acid by using biological charcoal prepared from sludge through a hydrothermal method to promote the anaerobic fermentation of sludge The specific method comprises: using the remaining sludge of a sewage treatment plant as an anaerobic fermentation matrix, additionally adding a certain amount of biological charcoal prepared through a hydrothermal method, and carrying out anaerobic fermentation under a medium-temperature stirring condition According to the present invention, the method achieves the resource utilization of sludge, and has advantages of simple process method, low running cost, high yield, and the like

Method for promoting sludge to produce short-chain fatty acid by using sludge matrix hydrothermal charcoal

The invention discloses a bioleaching reinforcing agent, and a method used for removing sludge heavy metal. According to the method, a nitrite is added on the base of bioleaching, so that free nitrous acid is obtained, dissolution efficiency of heavy metal, especially organic combined heavy metal, in sludge is increased obviously, and problems of conventional bioleaching that treatment period is long (usually 10 to 15d) and treatment efficiency is low are solved. According to the method, a bioleaching culture substance is obtained via culture and domesticate of original sludge, adding of purebred sulphur bacteria or complex original sulphur bacteria screening and pure culture are not needed, treatment cost is reduced greatly, and operation difficulty is reduced. In sludge treatment process, sludge setting performance and killing effect on sludge pathogens are improved, favorable conditions are provided for sludge subsequent treatment and utilization. The nitrite in the bioleaching reinforcing agent is cheap, and can be obtained easily. The application prospect is promising.

Bioleaching reinforcing agent, and method used for removing sludge heavy metal

The invention discloses a method for promoting residual sludge to carry out anaerobic fermentation to produce acid, and belongs to the technical field of solid waste processing and recycling. The provided method aims to solve the problems of low hydrolysis speed and insufficient short-chain aliphatic acid accumulation during the sludge anaerobic digestion process. The sludge is subjected to a nitrite pretreatment to increase the dissolution of organic matters, then the pH value is adjusted to an alkaline area to further promote the organic matter hydrolysis and short-chain aliphatic acid accumulation during the sludge anaerobic fermentation process, and at the same time the activity of microorganisms, which can produce methane, is prohibited, so the yield of short-chain aliphatic acid is increased. The provided method can effectively shorten the retention time of sludge anaerobic fermentation, increase the acid producing efficiency, and achieve the goals of sludge reduction and recycling.

Method for promoting residual sludge to carry out anaerobic fermentation to produce acid

The invention discloses a method for producing short-chain fatty acid by anaerobic fermentation of residual sludge, and discloses a method for producing short-chain fatty acid by utilizing Mg to promote anaerobic fermentation of the residual sludge. In order to solve the problems that short-chain fatty acid is not accumulated enough in a residual sludge fermentation process and the fermented sludge is poor in dehydration property, a method of adding MgC12.6H2O at an initial sludge fermentation stage is adopted, and the sludge floc disorder is promoted by utilizing the characteristic that the Mg exchanges with other metal ions in the sludge in a fermentation process so as to release a great number of microbial available organic substances, so that the acid output is increased; meanwhile, the Mg can improve the composition of the microbial flora in the sludge, so that the variety and the total number of a species of the microorganisms are improved. According to the method, cheap and easily available MgC12.6H2O is adopted to increase the yield of the short-chain fatty acid of the sludge while the dehydration property of the sludge is improved, and therefore, the method is beneficial for subsequent treatment of the sludge, and recycling and reduction of the sludge are effectively realized.

Method for producing short-chain fatty acid by anaerobic fermentation of residual sludge

The invention discloses a sulfur modified iron-manganese bimetallic oxide and a preparation method and application thereof. The method comprises the following steps: dissolving iron salt and manganesesalt in water under protection of nitrogen, regulating the pH of a solution to be 7-8, then adding a sulfur source, and reacting to obtain a sulfur modified iron-manganese bimetallic oxide material.The preparation method is simple, the cost is low, compared with an unmodified material, the prepared sulfur modified iron-manganese bimetallic oxide material has the advantages that the adsorption rate, adsorption affinity and adsorption capacity to arsenium and antimony are greatly increased, and moreover, a good removal effect for low-concentration arsenium and antimony wastewater is also achieved.

Sulfur modified iron-manganese bimetallic oxide and preparation method and application thereof

The invention discloses a method for removing EDTA-Pb by using an iron salt-desulfurization gypsum system, and belongs to the technical field of solid waste treatment and resource utilization. The iron salt-desulfurization gypsum system is constructed, iron ions act as a displacer for displacement of lead chelated with carboxyl groups to release lead ions, and desulfurization gypsum acts as a trapping agent for the lead ions for precipitation separation of the lead ions. The method has simple operation and low cost, and uses the iron salt-desulfurization gypsum system to quickly remove the EDTA-Pb to achieve the purpose of using waste for treatment of the waste and achieve removal of 98% of the chelated lead in 5 minutes without destroying organic matters. The method has a good applicationprospect.

Method for removing EDTA-Pb by using iron salt-desulfurization gypsum system

The invention discloses a method for removing complex-state copper in high-salinity wastewater by utilizing sulfur-modified nano zero-valent iron, and belongs to the field of industrial wastewater treatment. The method comprises the following steps: adding sulfur-modified zero-valent iron into a solution containing complex-state copper, adjusting the pH value to 2-9, uniformly mixing, and removingthe complex-state copper. The complexing copper comprises any one of ethylenediamine tetraacetic acid complexing copper, diethyl triamine pentaacetic acid complexing copper, citric acid complexing copper, nitrilotriacetic acid complexing copper or glycine complexing copper. The method for removing the complex copper can overcome the influence of high salt and high organic matter concentration, high removal efficiency is achieved, and therefore water pollution treatment is achieved efficiently and cleanly.

Method for removing complex-state copper in high-salinity wastewater by using sulfur-modified nano zero-valent iron

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