Abstract: The present disclosure relates to a method and system for improving solid-liquid separation performance of sludge by in-situ crystallization of water. The method comprises the following steps: adding sludge into a pressure vessel, intermittently introducing high-pressure carbon dioxide at a low-temperature condition to generate a carbon dioxide hydrate until a partial pressure of the carbon dioxide is stable, releasing the pressure, and stirring the sludge until no gas escapes, thus obtaining the treated sludge. Compared with the prior art, the method and system provided by the present disclosure are simple and easy to implement, has no consumption of sludge dewatering conditioning agents, and can achieve the recycling of carbon dioxide.

Abstract: An organic solid waste anaerobic digestion device based on uncoupling of hydraulic retention time (HRT) from sludge retention time (SRT) includes a self-sustaining air flotation screening tank. A sludge pipe of the self-sustaining air flotation screening tank is connected with a first separating mechanism. A bottom of the first separating mechanism is connected with a second separating mechanism, and two separating mechanisms are connected with a return pipe of the self-sustaining air flotation screening tank. Through the two separating mechanisms, the heavy inert materials at the bottom of the self-sustaining air flotation screening tank can be subjected to swirl separation, so that the liquid part, the solid part and the gas part can be completely separated, and then the useful active materials are conveyed to the reaction device.

Abstract: A thermal pretreatment method for organic solid waste based on forced hot air convection is performed as follows. Experimental materials are grouped into an experimental group and a control group. The experimental group is subjected to thermal pretreatment in a thermal pretreatment device, and then removed. The experimental group and the control group are subjected to enzymatic hydrolysis and physicochemical characterization, and the analysis results are compared. A thermal pretreatment device for organic solid waste based on forced hot air convection is also provided.

Abstract: A method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge is disclosed. The method includes subjecting sludge to a centrifugation, a thermal baking and a redissolution in softened water in sequence to renew a solid-liquid interface in sludge, and subjecting the sludge to an anaerobic digestion to increase methane production from organic matter in the sludge by anaerobic biotransformation.

Abstract: The present invention relates to microbial carriers for wastewater treatment, and in particular, relates to an organic composite powder carrier and its application for strengthening biological denitrification in municipal wastewater treatment. The organic composite powder carrier is compounded by a microbial carrier with a relatively large equivalent particle size and an organic alternative carbon source in the form of ultrafine powder. The composite powder carrier in the present invention includes a dedicated organic alternative carbon source, such as polyhydroxyalkanoates (PHA). The organic alternative carbon source can exclude the competitive relationship between microorganisms to ensure that denitrifying bacteria exclusively obtain electron donors required for denitrification.

Abstract: The disclosure relates to a method for enhancing methanogenesis in anaerobic digestion of municipal sludge by utilizing a filter screen structure, comprising: arranging a filter screen structure with titanium or titanium alloy as the framework and Fe3O4 as the coating in the anaerobic digestion system to accelerate the rate of hydrolysis and acidification, and increase the proportion of methane in biogas.

Abstract: An anaerobic digestion device based on self-sustained air flotation includes an anaerobic digestion tank unit, a self-sustained air flotation screening unit and a biogas measurement and collection unit. The self-sustained air flotation screening unit includes an air flotation screening part, a material sedimentation part, a reflux part and a three-phase separation part connected sequentially from bottom to top. A digested material in the anaerobic digestion tank unit is pumped into the air flotation screening part, overflows into the material sedimentation part, and then is raised to the reflux part. Gas passing through the three-phase separation part and gas produced in the anaerobic digestion tank unit enter the biogas measurement and collection unit to be measured and collected.

Abstract: An MEC reactor system for strengthening anaerobic digestion is provided. The MEC reactor system includes a reactor module; multiple biological anode plates and multiple biological cathode plates which are arranged in the reactor module; and an automatic control power supply. An anode and a cathode of the automatic control power supply are respectively connected with anode area wires and cathode area wires, the anode area wires are electrically connected with the biological anode plates, and the cathode area wires are electrically connected with the biological cathode plates. The biological anode plates and the biological cathode plates are subjected to biofilm culturing and acclimation in a biological anode plate acclimation area and a biological cathode plate acclimation area respectively; and in an anaerobic digestion reaction area, anaerobic digestion is strengthened based on the biological anode plates and the biological cathode plates which complete biofilm culturing acclimation.

Abstract: The disclosure relates to a method for enhancing methanogenesis in anaerobic digestion of municipal sludge by utilizing a filter screen structure, comprising: arranging a filter screen structure with titanium or titanium alloy as the framework and Fe3O4 as the coating in the anaerobic digestion system to accelerate the rate of hydrolysis and acidification, and increase the proportion of methane in biogas.

Abstract: A recovery system of composite powder carrier in HPB municipal wastewater treatment includes a biochemical tank and a concentration tank. The composite powder carrier is added to the biochemical tank for biochemically treating on the wastewater. The mixed liquid is then made to flow into the concentration tank. The supernatant obtained after filtration is then discharged. The concentrated sludge is returned to the biochemical tank, and the excess concentrated sludge is transported to a separator. The separator separates the substances with large specific gravity from those having smaller specific gravity, and the substances with large specific gravity are recycled to the biochemical tank for reuse. Matter having smaller specific gravity is discharged. The separator can be used to separate the composite powder carriers for recycling, which improves the utilization rate of the composite powder carriers and reduces the operation cost of the HPB technology for wastewater treatment.

Abstract: Disclosed are a device for strengthening anaerobic sludge digestion based on conical-coiled pipe coupling and an anaerobic sludge digestion method. The device comprises a feeder (A-3, B-3), a conical-coiled pipe coupling reactor (A-1, B-1) and a thermostat (A-4, B-4), wherein the bottom of the feeder (A-3, B-3) communicates with the top of the conical-coiled pipe coupling reactor (A-1, B-1), and the bottom of the feeder (A-3, B-3) is flush with the top of the thermostat (A-4, B-4); the conical-coiled pipe coupling reactor (A-1, B-1) is arranged in the thermostat (A-4, B-4); the whole coupling reactor (A-1, B-1) is in a regular cone shape or an inverted cone shape; and a main body of the coupling reactor (A-1, B-1) is a coiled pipe (A-2, B-2).

Abstract: A process for enhanced anaerobic digestion of sludge by alcoholization of food waste, comprising steps of: (1) ethanol prefermentation of food waste—feeding the food waste having been crushed into a uniform grain size into an ethanol production reactor, where the food waste is subjected to rapid and efficient anaerobic fermentation activated by addition of yeast and pH adjustment to produce ethanol and obtain a fermentation broth and a fermentation residue; (2) sludge pretreatment—pretreating the sludge after mixing with the fermentation residue; and (3) methanogenesis of anaerobic digestion—subjecting products resulting from the sludge pretreatment to be mixed with the fermentation broth and then to methanogenesis of anaerobic digestion in a methane production reactor. With this process, the sludge and the food waste can be treated efficiently via multi-phase reactions, and the resource recovery and biogas quality can be enhanced.

Abstract: A method for enhancing biochemical water treatment by a powder carrier includes: (i) screening the powder carrier by removing impurities to obtain a screened powder carrier; (ii) dissolving the screened powder carrier by stirring to prepare a slurry, enabling the screened powder carrier to completely absorb moisture to obtain a soaked powder carrier slurry; (iii) adjusting the pH value and adding the soaked powder carrier slurry into a bioreactor or a biological reaction structure; (iv) distributing the soaked powder carrier slurry uniformly through a hydraulic agitation; (v) loading a microorganism on the inner pore and wrapping on the surface of the soaked powder carrier slurry to obtain powder-loaded biological floccules; (vi) settling the powder-loaded biological floccules in a sedimentation zone and separating the powder carrier from the microorganism for reuse.

Abstract: Provided herein is a method for anaerobically fermenting an organic solid waste, including: subjecting the organic solid waste to anaerobic fermentation under catalysis of a zirconium-based metal organic framework (MOF) material.

Abstract: A method for harmlessly pretreating an organic solid waste based on combination of calcium ion and hydrothermal treatment, including: preliminarily screening the organic solid waste followed by addition of calcium ions and hydrothermal treatment to make the organic solid waste harmless.

Abstract: Anaerobic digestion is enhanced based on the coupling of electron transfer with microbial electrolytic cell. A traditional anaerobic digestion reactor is used as the main body, a microbial electrolytic cell applied with a micro voltage is constructed, and the electron transfer in the system is optimized by an immobilized conductor material, to establish an efficient electron output-transfer-consumption anaerobic digestion pathway to produce methane.

Abstract: An anaerobic digestion device based on self-sustained air flotation includes an anaerobic digestion tank unit, a self-sustained air flotation screening unit and a biogas measurement and collection unit. The self-sustained air flotation screening unit includes an air flotation screening part, a material sedimentation part, a reflux part and a three-phase separation part connected sequentially from bottom to top. A digested material in the anaerobic digestion tank unit is pumped into the air flotation screening part, overflows into the material sedimentation part, and then is raised to the reflux part. Gas passing through the three-phase separation part and gas produced in the anaerobic digestion tank unit enter the biogas measurement and collection unit to be measured and collected.

Abstract: A method for harmlessly pretreating an organic solid waste based on combination of calcium ion and hydrothermal treatment, including: preliminarily screening the organic solid waste followed by addition of calcium ions and hydrothermal treatment to make the organic solid waste harmless.

Abstract: A method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge is disclosed. The method includes subjecting sludge to a centrifugation, a thermal baking and a redissolution in softened water in sequence to renew a solid-liquid interface in sludge, and subjecting the sludge to an anaerobic digestion to increase methane production from organic matter in the sludge by anaerobic biotransformation.

Abstract: A process for enhanced anaerobic digestion of sludge by alcoholization of food waste, comprising steps of: (1) ethanol prefermentation of food waste—feeding the food waste having been crushed into a uniform grain size into an ethanol production reactor, where the food waste is subjected to rapid and efficient anaerobic fermentation activated by addition of yeast and pH adjustment to produce ethanol and obtain a fermentation broth and a fermentation residue; (2) sludge pretreatment—pretreating the sludge after mixing with the fermentation residue; and (3) methanogenesis of anaerobic digestion—subjecting products resulting from the sludge pretreatment to be mixed with the fermentation broth and then to methanogenesis of anaerobic digestion in a methane production reactor. With this process, the sludge and the food waste can be treated efficiently via multi-phase reactions, and the resource recovery and biogas quality can be enhanced.