50 results about "Volatile suspended solids" patented technology

The invention relates to a method for improving acid production quality and acetic acid proportion in anaerobic fermentation of residue active sludge. The method comprises the following steps of firstly, adding calcium peroxide into concentrated residual sludge in a wastewater treatment plant, wherein adding amount of the calcium peroxide is 5%-20% of the weight of the volatile suspended solid in the residual active sludge; then, sealing at 30-40 DEG C, carrying out anaerobic digestion in an anaerobic digestion tank with stirring speed of 100-200rpm, wherein the anaerobic digestion time is 5-10 days. The result indicates that calcium peroxide can promote dissolution of particulate organic substances, can improve acidification degree of deliquescent organic substances and can inhibit a methane production process, so that accumulation of volatile short-chain fatty acid is facilitated and transformation of other acids to acetic acid is promoted; meanwhile, a plurality of harmful organic substances in the sludge are effectively removed, so that the acid production quality in anaerobic fermentation of the residue active sludge is improved. The method disclosed by the invention is simple to operate and gentle in reaction condition, is used for recycling and carrying out harmless disposal on the concentrated residual sludge of the sewage treatment plant, and has very good economic and social benefits.

The invention provides a device and a method for improving the biological dephosphorizing and denitriding efficiency of low carbon source sewage, belonging to the technical fields of sewage treatment and residual sludge treatment. The method comprises the following steps of: under the microwave alkaline hydrolysis condition, hydrolyzing solid organic matters in the residual sludge into soluble organic matters; recovering and hydrolyzing nitrogen and phosphor in supernate by adopting a magnesium ammonium phosphate setting method; and adding the hydrolyzed supernate subjected to dephosphorizing and denitriding treatment in the low carbon source sewage and carrying out biological dephosphorizing and denitriding treatment on the hydrolyzed supernate so as to improve the biological dephosphorizing and denitriding efficiency of the low carbon source sewage. According to the invention, by carrying out the microwave alkaline hydrolysis treatment on the residual sludge to produce high-concentration soluble organic matters easy to biodegrade, the product can be used as a low-price carbon source subjected to biological dephosphorizing and denitriding treatment in the lower carbon source sewage, and the biological dephosphorizing and denitriding efficiency in the lower carbon source sewage can be improved; meanwhile, sludge minimization, reclamation and harmlessness can be realized. The VSS (Volatile Suspended Solids) solubility in the sludge can be improved to 82 percent, so that the effluent quality of the low carbon source sewage treated by the device and the method achieves the first-class B standard 'Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant' (GB18918-2002).

The invention provides a bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment system and a bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment method for solving the frequency problems of high sand content in incoming water, low volatile suspended solid (VSS) / mixed liquor suspended solids (MLSS), inadequate carbon source and the like in the conventional denitrification and dephosphorization process. The system consists of a main waste water treatment system having denitrification and dephosphorization functions and a bypass system, wherein the main waste water treatment system comprises a grit chamber and a waste water treatment system having denitrification and dephosphorization functions; and the bypass system consists of a hair separator, a sludge reduction pool, a sludge and silt separator, a silt dewatering system and a chemical dephosphorization system. In the invention, by discharging the sludge and silt and retaining slit organic matters, the silt is prevented from depositing in the waste water treatment system and the VSS / MISS ratio of the sludge in a biochemical reaction pool is improved. By returning the sludge recycled as a carbon source, a carbon source is provided for the main waste water treatment system. By applying chemical dephosphorization in the embedded bypass system, the phosphorus in urban waste water can be removed and recycled chemically at low cost.

The invention belongs to the filed of microbiological fuel cells, and provides a method for strengthening electricity generating performance of an MFC (Microbial Fuel Cell) by taking excess sludge as fuel and strengthening sludge reduction by enzyme. The method comprises the steps of adding 20mM of NaCl in the excess sludge for strengthening the electrical conductivity of solution, adding neutral protease and Alpha-amylase, and generating electricity by directly using electricity generating microorganisms in the excess sludge for one day so as to start the MFC and obtain higher electric energy, wherein the strengthening effect of the neutral protease and the Alpha-amylase on an SMFC (Sediment Microbial Fuel Cell) at 40 DEG C is the most obvious. Under a condition that the total concentration of the enzyme is not changed, the mass concentration ratio of the neutral protease and the Alpha-amylase is 2:3, at the moment, the power density is the largest (776mW*m-2), and the removal rates of TCOD (total chemical oxygen demand), TSS (total suspended solids) and VSS (volatile suspended solids) reach 87.29%, 91.75% and 95.01% respectively. The method is fast in starting, simple in process, convenient to operate, and low in cost, and can treat the excess sludge in an urban domestic sewage treatment plant.

The invention relates to a wastewater treatment process with an effect of coupling nano magnetite for enhancing the activity of anaerobic microorganisms, and aims at solving the problems that a traditional anaerobic biological treatment system is easy to acidify, instable in performance and the like. Nano magnetite of which the average particle size is smaller than 100nm is prepared by the steps of dissolving ferric salts, precipitating, separating, washing and the like; the nano magnetite and anaerobic sludge are sufficiently and uniformly mixed at a proportion of 1.55gFe / g MLVSS (Mixed Liquor Volatile Suspended Solid) by a stirring method, a nitrogen blowing method and the like; a mixture is cultured by an anaerobic organism treatment device under the constant temperature condition of 35DEG C; with good electrical conductivity and high specific surface area of the nano magnetite, interspecific electron transfer between the anaerobic microorganisms is remarkably enhanced, the activity of the anaerobic microorganisms is greatly improved, and finally, the performance of an anaerobic organism treatment process is improved.

The invention relates to a pretreatment method for increasing the yield of excess sludge anaerobic digestion methane. Firstly, calcium peroxide is added into remaining concentrated sludge of a sewage treatment factory, and the addition amount of calcium peroxide accounts for 5-20% of the mass of volatile suspended solid in the remaining sludge; then, microwave radiation is carried out, the mixture is placed in an anaercbic digestor for anaerobic digestion at the temperature of 30-40 DEG C at the stirring speed of 100-200 rpm, and anaerobic digestion time is about 16 days. Results show that the calcium peroxide / microwave combined pretreatment technology can promote dissolving of particulate organic matter, increase the yield of the sludge anaerobic digestion methane and improve dewaterability of sludge after anaerobic digestion. The method is easy to operate, moderate in reaction condition and good in economic benefit and social benefit and is used for recycling, harmlessness and reduction of the remaining concentrated sludge of the sewage treatment factory.

The invention discloses a sludge anaerobic fermentation treatment method synchronously enhancing acid production and phosphorus removal, and belongs to the field of sludge and sewage treatment. The method includes the steps that (1) excess sludge is added to an anaerobic reaction system, wherein the concentration of total suspended solids (TSS) of the excess sludge is 10000-15000 mg / L, and the concentration of volatile suspended solids (VSS) is 6000-9000 mg / L; (2) the pH value of the excess sludge is adjusted to be 10+ / -0.1 with a sodium hydroxide solution; magnetite is added to the excess sludge with the addition amount of the magnetite being 0.3-0.9 g / gVSS; after air in a reactor is removed, the reactor is sealed, anaerobic fermentation is carried out for 10-15 days in the stirring state, and the pH of the excess sludge is maintained at 10+ / -0.1 all the time in the stirring fermentation process. Compared with a simple alkaline condition, under the condition of the method, the accumulation of short-chain fatty acid is increased by 20% or above, and acid production by anaerobic fermentation of the excess sludge is effectively promoted; besides, the content of orthophosphoric acid in excess sludge fermentation liquor is reduced by 10% or above, and the influence of the fermentation liquor as a carbon source on biological phosphorus removal is alleviated.

The invention discloses aerobic granular sludge with a pyridine degradation function as well as cultivation and application thereof. The sludge is obtained from a single strain (Rhizobiumsp.) NJUST18 with self-flocculation characteristics in a cultivation manner. A pyridine specific degradation strain (Rhizobiumsp.) NJUST18 is adopted as inoculum, a reactor form of a sequencing batch reactor (SBR) is adopted, and formation of pyridine degradation particle sludge is facilitated by using the self-flocculation characteristic of the (Rhizobiumsp.) NJUST18 and controlling the parameters such as operation cycle, sedimentation time and organic load of an SBR system. The aerobic granular sludge with the pyridine degradation function can take pyridine as a sole carbon source and nitrogen source to grow. The aerobic granular sludge is regular in particle shape, good in settling property (the sludge index (SVI) value just is 25.6mL / g), high in sludge concentration of the reaction system (the concentration of mixed liquor volatile suspended solid (MLVSS) can be up to 4610mg / L), and high in degradation efficiency (the maximal degradation rate Vmax can be up to 1867.4mgl<-1>h<-1>). Complete degradation of 4200mg / L of pyridine can be achieved within 7.5 hours in the SBR system after the granular sludge is matured.

A method of recovering polyhydroxyalkanoates (PHAs) from municipal waste sludge includes: (a) removing coarse particles in the municipal waste sludge and measuring a solid content in the municipal waste sludge in terms of a volatile suspended solid in the municipal waste sludge; (b) removing a supernatant from the municipal waste sludge; (c) freezing the municipal waste sludge; (d) adding a controlled amount of sodium hypochlorite solution to the municipal waste sludge that has been frozen, a ratio of the solid content of the municipal waste sludge to a volume of the sodium hypochlorite solution added in step (d) ranging from 0.67 mg / ml to 4 mg / ml and being defined as a liquid-solid ratio; and (e) separating PHAs from non-PHAs substances in the municipal waste sludge obtained in the step (d).

The invention discloses a method for improving terramycin impact resistance of anammox sludge. The method comprises the following steps: inoculating anammox particle sludge in an anaerobic sludge reactor, performing operation treatment on ammonia nitrogen-containing wastewater, and monitoring the terramycin content in the wastewater on line, wherein terramycin impact exists when the terramycin content is increased to be 500mg / L or more; and adding fresh anammox particle sludge into the anaerobic sludge reactor, wherein the mass of volatile suspended solids in the fresh anammox particle sludge accounts for 3-8 percent of the mass of volatile suspended solids contained in the original particle sludge in the anaerobic sludge reactor. With the adoption of a biological enhancement mode, the restoration time of the anaerobic sludge reactor can be shortened, and the terramycin impact resistance stability of the reactor is enhanced.

The invention relates to primary sludge fermentation pretreatment method and system for improving the performances of dephosphorization and denitrification on town sewage. In an integrated flocculation fermentation settling pond, a suspended sludge floc layer is formed and maintained with a certain interface height through auxiliary stirring and natural flocculent settling so as to realize the flocculent settling of suspended solids and colloids and tendentious separation of suspended solid inorganic components, and biotic populations in the suspended sludge floc layer have stronger effects of hydrolysis and fermentation on the suspended solids, the colloids and soluble organic matters. In the invention, the resolution ratio on the suspended solids and the colloids is 15-50 percent, the volatile fatty acid concentration is improved by 20-150 percent, the VSS / SS (Volatile Suspended Solid / Suspended Solid) ratio of effluent is improved by 20-60 percent, and the proportion of a high-quality carbon source is improved while the content of the suspended solid inorganic components is obviously reduced, which is beneficial to improving the capability of the subsequent processes on sludge activation as well as dephosphorization and denitrification. The invention has the advantages of convenient implementation, simple operation and management, flexible process adjustment and obvious effect.

A method of recovering polyhydroxyalkanoates (PHAs) from municipal waste sludge includes: (a) measuring a solid content in the municipal waste sludge in terms of a volatile suspended solid in the municipal waste sludge; (b) removing supernatant from the municipal waste sludge; (c) freezing the municipal waste sludge; (d) conducting a pretreatment of the municipal waste sludge that has been frozen; (e) adding a surfactant into the pretreated sludge to obtain a slurry; (f) adding a controlled amount of sodium hypochlorite solution to the municipal waste sludge obtained in step (e), a ratio of a volume of the sodium hypochlorite solution to the solid content of the municipal waste sludge ranging from 0.67 mg / ml to 1.25 mg / ml and being defined as a liquid-solid ratio; and (g) separating PHAs from non-PHAs substances in the municipal waste sludge obtained in the step (f).

The invention discloses a method for producing methane by using sludge to regulate fruit and vegetable wastes to reinforce single-phase fermentation. The method comprises the following steps: smashing the fruit and vegetable wastes, adding the smashed fruit and vegetable wastes into a fermentation reactor, adding the residual condensed sludge with the volatile suspended solid concentration of 13-16 g / L, wherein the weight of the fruit and vegetable wastes is 100 parts and the excess sludge is 5-60 parts, and adding water to get constant volume till the effective volume is 1L; inoculating 10g of anaerobic granular sludge according to per 100mL of fermentation substrate, controlling the pH value to 6.5-8, and controlling the temperature at 35 DEG C and anaerobically stirring for 7-20 days. The residual sludge is added to regulate the substrate nutritional structure, the anaerobic granule sludge is inoculated to regulate the microbes so as to avoid the start failure of the fermentation reaction, and the key technical problems of rapid hydrolytic acidification speed and slow consuming speed of the organic acid by the methanogenesis microbes in the fruit and vegetable wastes single-phase fermentation process are effectively solved; the single-phase fermentation can be stably processed, the substrate solid removing efficiency of the fruit and vegetable wastes single-phase fermentation is increased and the biogas production is increased by at least 3 times, and further the fermentation period is shortened.

The invention relates to a method for storing and exciting anaerobic ammonium oxidation sludge. The method for storing the anaerobic ammonium oxidation sludge comprises the steps as follows: firstly, washing the anaerobic ammonium oxidation sludge needed to be stored by an inorganic salt solution, and placing in a storage container; secondly, adding the inorganic salt solution for adjusting the volatile suspended solid concentration of the anaerobic ammonium oxidation sludge to be 10-36 g / L and the pH value to be 7.5-8.0; thirdly, filling argon gas; and lastly, sealing the storage container, and storing in a refrigerator of 0-4 DEG C. The method for exciting the anaerobic ammonium oxidation sludge comprises the steps as follows: taking out the anaerobic ammonium oxidation sludge, washing by the inorganic salt solution, adding a nutrient solution, filling up distillation water into an excitation container, adjusting the pH value to be 7.0-7.5, filling the argon gas, vibrating for cultivation, sampling and measuring the concentrations of NH4+-N and NO2--N in the cultivation process, and adding a matrix concentration solution as needed. The method has the advantages of simple equipment requirements, higher activity retention rate, shorter excitation time and better excitation effect.

The invention discloses a biological hydrogen production method by culturing hydrogen production granular sludgesto to improve the hydrogen production efficiency and stability characterized in charging methane floccule sludges into the reactor to make the volatile suspended solid density be 3-7g / L in the reactor, controlling the flow rate of the organic wastewater flowing through the reactor to make the organic wastewater stay in the reactor for 5-20 hours; regulating the solution pH to 4.0-4.5 in the reactor, and the hydraulic loading to 15-30g / (L.d) from 2-5g(L.d) by increasing 0.1-0.5g(L.d) day by day; steadily operating till a hydrogen production granular sludge containing bultyric acid bacillus mainly and coccus forms in the reactor, then steadily operating till the volume of the hydrogen production granular sludges is 50-70% of the reacting area volume in the reactor. The invention solves the problems of low hydrogen production efficiency by floccule sludges, no steady and continuous hydrogen production existing in known biological hydrogen production method using organic wastewater, and the hydrogen production efficiency can be 1.22-1.37molH.

The invention provides an online measuring device for specific oxygen uptake rate (SOUR) of activated sludge in a sewage treatment system. The online measuring device is characterized by comprising a pre-aeration unit, an SOUR metering unit, a biomass metering unit, and a data control and calculation unit, wherein the pre-aeration unit comprises a first electric control valve, a first water pump, a second water pump, a pre-aeration tank and an aeration system, wherein the SOUR metering unit comprises a second electric control valve, a third electric control valve, an airtight breathing chamber, a dissolved oxygen meter and an electromagnetic stirrer, the biomass metering unit comprises a fourth electric control valve, a fifth electric control valve and an active micro-biomass online detection system, and the data control and calculation unit comprises a data acquisition card, a computer and a software program system. According to the online measuring device, the total active micro-biomass in the activated sludge system is adopted for replacing mixed liquor suspended solids (MLSS) or mixed liquor volatile suspended solids (MLVSS) in a conventional SOUR calculation method so as to accurately measure the SOUR of the activated sludge.

The invention relates to a blast aeration system oxygenation efficiency change judgment method and system based on big data. The method comprises the steps of acquiring real-time water inlet parameters, aerobic pool internal parameters, air flow data and atmospheric pressure data from a sewage treatment plant; acquiring fixed parameters of a sewage treatment plant; obtaining change parameters through experimental measurement or big data fitting; through a historical data fitting method, respectively obtaining a real-time inflow BOD5 value, a tail end BOD5 value and a mixed liquid volatile suspended solid concentration value according to the chemical oxygen demand of the inflow parameters and the parameters in the aerobic tank and the concentration data of the mixed liquid suspended solid;and based on a calculation formula of the air flow data required by the sewage treatment plant, judging the change condition of the oxygenation efficiency of the blast aeration system according to theobtained data. Compared with the prior art, the method is simple and easy to implement; extra manual work and facility field operation are not needed; the application range is wide, and the like.

A biofilm process is disclosed for treating wastewater containing readily biodegradable dissolved organic matter GP (measured as chemical oxygen demand or COD) and producing surplus biomass from the biofilm process that includes an enhanced polyhydroxyalkanoate (PHA) content. The process comprises directing a wastewater influent containing the readily biodegradable COD (RBCOD) into a biofilm unit process. The PHA content of surplus biomass is enhanced by controlling for a decreased biofilm process specific organic loading rate in combination with controlling phosphorus loading rates relative to the process RBCOD loading rates: (1) controlling the wastewater influent phosphorus loading rate to the biofilm unit process includes maintaining an average RBCOD / P ratio of the influent that is between 200 and 800 g / g; (2) decreasing the process specific organic loading rate includes producing a biofilm unit process effluent having readily separable mixed liquor volatile suspended solids (RS-MLVSS); and (3) separating a portion of the RS-MLVSS from the biofilm unit process effluent and recycling at least a portion of the separated RS-MLVSS back to the biofilm unit process. The combination of the RBCOD / P control and specific loading rate control maintains, on average, the surplus biomass with a PHA content that is greater than 30% gPHA / g VSS.

The invention discloses a hydrothermal carbonization method of sludge. Firstly, sludge is pumped to a reactor, a catalyst is added to the sludge during pumping, and the catalyst comprises an active component and / or ozone for catalytic wet oxidation treatment; then, the reactor is heated for a hydrothermal carbonization reaction. Firstly, the catalyst is added to the sludge for catalytic wet oxidation treatment, volatile suspended solids in the sludge are removed, then, the rest sludge is subjected to hydrothermal carbonization treatment to be produced into charcoal, so that harmless treatmentof the sludge and emission reduction of sludge carbon are realized.

The invention belongs to the technical field of sludge treatment devices and particularly relates to a sludge composite conditioner and a conditioning method using the same. The sludge composite conditioner disclosed by the invention consists of conditioners A, B and C, wherein major components of the conditioners A, B and C are respectively hydrogen peroxide, ferrite and persulfate. The specific conditioning method comprises the following steps: (1), analyzing content of volatile suspended solid (VSS) in sludge, and calculating and respectively weighing / measuring a certain amount of the conditioners A, B and C according to a rule that every gram of VSS needs 1mmol-3mmol of the conditioner A, 1mmol-3mmol of the conditioner B and 1mmol-3mmol of the conditioner C; (2), adding the weighed / measured conditioners A, B and C into the sludge, and carrying out mechanical dehydrating operation onto the sludge after stirring for 1 minute-10 minutes. The method disclosed by the invention is simple, dosage of conditioners is less, cost is low, dehydrating effect is obvious, and sludge moisture content can be lowered to less than 60% from 97%-99%; after being dehydrated, the sludge can be directly filled and buried, applied in agriculture or used for producing building materials, and the like.

The invention relates to a nitrospira granular sludge culture method and device. The culture method includes inoculating flocculent activated sludge into an SBR reactor for enrichment culture; operating the SBR reactor in a sequencing batch mode; feeding water into the SBR reactor through a water inlet tank; starting aeration and stirring at the same time after the water feeding is completed; controlling the water temperature in the SBR reactor to be between 29-31 DEG C and the sludge age to be 20 days; and after enrichment culture for 90-100 days, converting the flocculent activated sludge inoculated in the SBR reactor into brown nitrospira granular sludge. The method solves the problems of deviation from actual application conditions, lower concentration of volatile suspended solids in the mixed solution and higher energy consumption in the existing nitrospira granular sludge culture method, and has the characteristics of higher treatment efficiency and simple operation and management.

The present document describes a process and a bioreactor for reducing a bisphenol compound content of a wastewater using a membrane bioreactor containing a biomass in a volatile suspended solid (VSS) form where the biomass in the membrane bioreactor is operating continuously to reduce bisphenol compound content when the bisphenol compound volumetric load is below 108 g m−3 d−1.

The invention discloses an intelligent device for treating sludge. The intelligent device comprises a pretreatment unit for detecting and adjusting the PH value of the sludge, a wet oxidation treatment unit for performing wet oxidation treatment on the sludge, a hydrothermal carbonization treatment unit for performing hydrothermal carbonization treatment on the sludge and a catalysis unit for adding a catalyst to the wet oxidation treatment unit and / or the hydrothermal carbonization treatment unit. The PH value of the sludge is adjusted by the pretreatment unit, then, a wet oxidation reactionis conducted in the wet oxidation treatment unit, volatile suspended solids in the sludge are removed, then, a hydrothermal carbonization reaction is conducted in the hydrothermal carbonization treatment unit, and the sludge is processed into biochar and a liquid phase product, so that harmless and reduction tretament of the sludge and reduction of emission of sludge carbon are realized.

The invention discloses a quick culture method for activated sludge during the process of viscose waste water by a SBR (Styrene Butadiene Rubber) technology, which belongs to the technical field of the sewage biotreatment and particularly relates to a quick culture method for mature activated sludge in a SBR technical unit when the viscose waste water is processed by the SBR technology and is mainly used for solving the problems of long culture period and low initial-stage sludge activity of the activated sludge of different sources so as to shorten debugging test run time and reduce damage to the environment by substandard waste water. The invention provides the quick culture method which can culture a fresh mud cake in a city sewage treatment plant into the mature activated sludge capable of processing viscose waste water in the SBR technical unit, and the culture period of the mature activated sludge can be controlled to 35-45 days; the cultured activated sludge is scentless, has thick fishlike smell, is ustulate, and has big floc and good huddling performance; SV30 is 25-35%, and an MLVSS (mixed liquor volatile suspended solid) value is controlled to be stably 3500-4500mg / L; and the CODcr (chemical oxygen demand) degradation rate of the discharged waste water is 80-90%.

The invention relates to a marine active sludge product, and a preparation method and a water treatment application of the marine active sludge product. The marine active sludge product is rich in salt-tolerant microorganisms and halophilic microorganisms from the ocean or other salt environments, and exists in a form of particle flocculent active sludge or a separation composite inoculant; the product has a DO (dissolved oxygen) content of 0.1-4.0mg / L, an ambient temperature of 0-50 DEG C, a salt concentration of 2-34% and a pH (potential of hydrogen) value of 5-9; and when the product exists in the form of the active sludge, an SVI (sludge volume index) of the product is 50-200mL / g, and an MLVSS (mixed liquor volatile suspended solid) is 1.2-7.5g / L. According to the preparation method, a halophilic microorganism culture technology and an active sludge culture technology are fused for use innovatively; a novel microorganism purification system for high-salt organic wastewater treatment is prepared; an operating system with high wastewater degradation capability, and economical operating cost and temperature is achieved; and an application range is wide. The invention further provides a relevant water treatment method. The water treatment capability and the application range of the marine active sludge product is improved and expanded, and the practicability is better.

An advanced treatment method after anaerobic digestion of excess sludge in an urban sewage treatment plant is applied to the enhancement of the advanced treatment of excess sludge. Nitrite is added topromote the reduction and stability of the digested sludge, and an anaerobic ammoxidation biofilm is used to in situ remove ammonia nitrogen released in the sludge degradation process. The excess sludge treated with the method has a low volatile suspended solid concentration, and is stable, the sludge obtained after the advanced treatment is odorless, and the subsequent treatment is safe and convenient. In addition, a sludge dehydration solution has a low ammonia nitrogen concentration, and can directly return to the front treatment unit of the municipal sewage treatment plant, so the impactload on the urban sewage treatment plant is reduced. The method for treating the digested sludge has the advantages of high treatment efficiency, low byproduct ammonia nitrogen concentration, and realization of high stability of the treated sludge, and is an efficient and economical sludge advanced treatment method.

A process for treatment of municipal wastewater plant sludge to the criteria of Class A biosolids. The process uses hydrogen peroxide and thermo-oxidation to reduce volatile suspended solids to meet the criteria. On a batch basis, waste activated sludge is introduced into a reactor; the concentration of the waste activated sludge is adjusted to about 1.5% total suspended solids with secondary effluent, if necessary; the reactor is mixed; the reactor is pre-heated to an operating temperature in a range of about 65° C. to about 90° C.; subsequently, a 50% solution of laboratory grade hydrogen peroxide is introduced into the bottom of the reactor; and the contents are heated for at least 4 hours.

The invention relates to a sewage sludge treatment device. The sewage sludge treatment device comprises a concentrating device (1), a first heat exchanger (2), a second heat exchanger (3), an anaerobic digestion reactor (4), an aerobic digestion reactor (5) and a sludge dewatering device (6) which communicate with one another sequentially, wherein a medium inlet of a heat exchange tube 2a in the first heat exchanger communicates with a returned sludge outlet (5a) of the aerobic digestion reactor, an outlet of the heat exchange tube (2a) communicates with a returned sludge inlet (5b) of the aerobic digestion reactor, and an inlet of a distributing pipe (5e) of a spraying member (5d) at the upper part of an internal cavity of the aerobic digestion reactor (5) communicates with the outlet of the heat exchange tube (2a) in the first heat exchanger or is connected with and communicates with the middle section of a third tube element (9). The sewage sludge treatment device has the characteristics that the efficiency of removal of volatile suspended solids from sewage sludge can be increased, meanwhile, ammonia nitrogen is reduced, and the energy consumption is lowered.

A method of recovering polyhydroxyalkanoates (PHAs) from municipal waste sludge includes: (a) removing coarse particles in the municipal waste sludge and measuring a solid content in the municipal waste sludge in terms of a volatile suspended solid in the municipal waste sludge; (b) removing a supernatant from the municipal waste sludge; (c) freezing the municipal waste sludge; (d) adding a controlled amount of sodium hypochlorite solution to the municipal waste sludge that has been frozen, a ratio of the solid content of the municipal waste sludge to a volume of the sodium hypochlorite solution added in step (d) ranging from 0.67 mg / ml to 4 mg / ml and being defined as a liquid-solid ratio; and (e) separating PHAs from non-PHAs substances in the municipal waste sludge obtained in the step (d).

The embodiments of the invention provide a competitive method for determining the volume of a biological reaction tank, and a sewage treatment method, which are applied to a bioreactor system. The bioreactor system comprises an anoxic tank and an aerobic tank. The method for determining the volumes of the anoxic tank and the aerobic tank comprises the steps of calculating sludge retention time according to chemical oxygen consumption of inflow water of a bioreactor and five days' biochemical oxygen demand of the inflow water of the bioreactor; determining a first coefficient at least according to a corresponding relation between the first coefficient and the quotient of a suspended matter concentration of the inflow water and a difference between five days' biochemical oxygen demands of the inflow water and outflow water; calculating an average concentration of volatile suspended solids of mixed liquid in the bioreactor according to the first coefficient and a preset average concentration of suspended solids of first biological mixed liquid; calculating the volume of the biological reaction tank at least according to the design flow, sludge yield coefficient and sludge retention time of the bioreactor system. After the competitive method and the sewage treatment method are applied, the sewage treatment capacity of the bioreactor system is enabled to be matched with the design flow.