Tongji University

Hunan Sanyou Environmental Technology Co., Ltd

Shanghai Urban Pollution Control Engineering Research Center Co., Ltd.

Xiaohu Dai

Yu Hua

Bin Lu

Chen Cai

Ying Xu

Xiaoli Chai

Lei Li

Bin Dong

Dan Hou

Hongbo Han

Jing Yi

Shuxian Chen

Lingling Dai

Yue Mou

Boran Wu

Huiping Li

Yue Zhang

Zhigang Liu

Jun Gao

Dezhen Chen

Zheng Zhou

Lijie Yin

Yuyan Hu

Xiaobo Ma

Lipeng Dong

Linke Zheng

Xiuzhong Wang

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-, B-), a conical-coiled pipe coupling reactor (A-, B-) and a thermostat (A-, B-), wherein the bottom of the feeder (A-, B-) communicates with the top of the conical-coiled pipe coupling reactor (A-, B-), and the bottom of the feeder (A-, B-) is flush with the top of the thermostat (A-, B-); the conical-coiled pipe coupling reactor (A-, B-) is arranged in the thermostat (A-, B-); the whole coupling reactor (A-, B-) is in a regular cone shape or an inverted cone shape; and a main body of the coupling reactor (A-, B-) is a coiled pipe (A-, B-).

Device for strengthening anaerobic sludge digestion based on conical-coiled pipe coupling and anaerobic sludge digestion method

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.

Thermal pretreatment method and equipment for organic solid waste based on forced hot air convection

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.

Method for enhancing anaerobic digestion based on solid-liquid interface renewal in sludge

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. The composite powder carrier strengthens biological denitrification in municipal wastewater treatment, significantly improves denitrification efficiency, realizes deep biological purification of wastewater and ensures that the subject effluent complies with the strictest domestic discharge standards.

Organic composite powder carrier and application thereof in enhanced biological denitrification of municipal wastewater treatment

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.

Anaerobic digestion device based on self-sustained air flotation

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 FeOas the coating in the anaerobic digestion system to accelerate the rate of hydrolysis and acidification, and increase the proportion of methane in biogas. Compared with the prior art, the disclosure increases the contact between FeOand anaerobic microorganisms by means of the screen structure; the stable crystal structure of FeOensures the sustainability as an electron carrier while enriching electroactive microorganisms; titanium or titanium alloy, as a material with high strength, corrosion resistance, good biocompatibility, and good conductivity, can form a good match with FeOand assist in promoting the electron transfer; the disclosure has the advantages of low cost, high income, no need of repeated dosing and stable effect, and could strengthen the oxidation and decomposition of organic matter in the anaerobic digestion, accelerate the rate of methanogenesis, and increase the gas production.

Method for enhancing methanogenesis in anaerobic digestion of municipal sludge by utilizing a filter screen structure

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.

Recovery system of composite powder carrier in HPB municipal wastewater treatment

A process for enhanced anaerobic digestion of sludge by alcoholization of food waste, comprising steps of: (1) ethanol prefermentation of food waste&#x2014;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&#x2014;pretreating the sludge after mixing with the fermentation residue; and (3) methanogenesis of anaerobic digestion&#x2014;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.

Process for enhanced anaerobic digestion of sludge by alcoholization of food waste

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.

Method for enhancing biochemical water treatment by powder carrier

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.

Method for anaerobically fermenting organic solid waste

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.

Method for harmlessly pretreating organic solid waste based on combination of calcium ion and hydrothermal treatment

The present invention discloses a filtering device used for removing impurities in a mixture of biological diatomite, which relates to the technical field of sewage treatment. This device includes a plurality of deflectors evenly distributed in multiple layers in the vertical direction. Each deflector includes a shell and a top plate. There is a filter unit symmetrically arranged on the left and right sides of each deflector. The top of the shell is covered with a top plate hinged with the depressed plate. The bottom of the shell is provided with water inlets which communicate with the shunt pipe, and the upper parts of the left and right side walls of the shell are provided with overflow ports. The shell also has a plurality of diversion folding plates located below the overflow ports and vertically staggered and distributed on the left and right side walls. The filter unit includes an inclined water guiding groove and a filtering plate.

Filtering device for removing impurities in a mixture of biological diatomite

A system for high-value utilization of organic solid waste includes an anaerobic digestion unit, a biogas measurement and collection unit and a methane purification and liquefaction unit. The anaerobic digestion unit includes an organic solid waste pretreatment system and an anaerobic digestion device. The biogas measurement and collection unit includes a gas flow meter and a high-pressure biogas collection device. The methane purification and liquefaction unit includes a high-pressure separation tank, a liquefaction pretreatment system, a heavy hydrocarbon and benzene removal device, a two-stage rectification system, a low-temperature pressure liquid storage tank device and a buffer storage tank. The organic solid waste undergoes an anaerobic digestion treatment to produce methane followed by collection, purification and liquefaction.

System for high-value utilization of organic solid waste

Provided is a method for evaluating a bioavailability of organic solid waste by an anaerobic conversion based on fractal dimension, relating to anaerobic digestion of organic solid waste. Organic solid waste is broken up and dried, and the organic solid waste is analyzed using a laser particle size analyzer, so as to measure a wave vector Q and a scattering intensity I. The wave vector Q and the scattering intensity I are analyzed using a data processing software, and a two-dimensional fractal dimension Dis obtained based on a fractal theory. A volatile fatty acid maximum VFAand a biochemical methane potential BMP of the organic solid waste are predicted according to the two-dimensional fractal dimension D, so as to evaluate a bioavailability of organic solid waste by an anaerobic conversion.

Method for evaluating bioavailability of organic solid waste by anaerobic conversion based on fractal dimension

Provided is a method for evaluating a pretreatment effect for organic solid waste based on fractal dimension, relating to biological conversion of organic solid waste. Samples of the organic solid waste are collected, and dried and broken up to obtain dried samples. The mixtures obtained are analyzed using a laser particle size analyzer, so as to measure a wave vector Q and a scattering intensity I of each of the mixtures. According to a fractal theory, the wave vector Q and the scattering intensity I obtained are analyzed using a data processing software to obtain a two-dimensional fractal dimension Dof each of the samples. Based on data from documents and experiments, a total organic carbon or an apparent activated energy is evaluated, so as to evaluate the pretreatment effects of samples of the organic solid waste.

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Shanghai, China

Xiaohu Dai