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Among the industries fundamental for modern life, wastewater treatment receives increasing interest for its potential to recuperate valuable resources. The biogas obtained through anaerobic digestion, more specifically, the methane it contains, often represents a powerful asset in operating a WWTP (wastewater treatment plant) economically. However, the microbiological processes that lead to obtaining...
Ammonia stripping is a simple desorption process used to reduce ammonia content in wastewater stream. It is often easier and less expensive to remove nitrogen from wastewater in the form of ammonia rather than to convert it to nitrate-nitrogen before discharged to environment. The main objective of this study is to evaluate the ability of the sewage based bacteria use to remove the ammoniacal nitrogen...
Dairy Industries produce nearly thousands of litres of effluent waste per day. This waste with high intense foul odour pollutes ecosystem and ground water, harbour pathogens causing health hazards. Various pre-treatments methods are available to neutralise the effects. But, bioremediation with EM technology is ecofriendly and helps to clean up contaminated environments through the use of microorganisms.
The avermectin wastewater was treated with SBR technique. This paper was focused mainly on the removal rate of COD and change of ammonia nitrogen of influent and effluent. At the stable phase of SBR reactor operation, the removal rate of COD could be about 75% when the influent volume load was 1.01 kg/(m3 d), and the effluent COD was below 300 mg/L. Temperature had a great impact on the effect of...
As the complexity of the process of MBR industrial wastewater treatment, most of its parameters are nonlinear and uncertain characteristics, but they can be a regression model under certain conditions. With the engineering data from a MBR wastewater treatment plant in Shijiazhuang City for three months, we combine three of the indicators in its process, COD, TN, and TP, then get the regression model...
The present study focused on investigation of biological nitrogen removal efficiency and the superiority of continuous feeding sequencing batch reactor system with a frequent anoxic-aerobic alternation strategy. The result indicated that continuous feeding SBR achieved an excellent efficiency for pollutants removal. The removal efficiency of COD and NH4+-N reached above 90% and 91.4% respectively...
The inhibitory effect of streptomycin on methane production of anaerobic granular sludge treating starch wastewater was investigated. The results indicated that the methane production of anaerobic granular sludge was influenced in the presence of streptomycin ranged from 0 to120 mg/L. The larger final methane production, the less remaining COD and the higher final pH value at the end of tests were...
The alkaline wastewater from oil refinery is a high concentration alkaline wastewater, which contains a great deal of sulfide, phenol and oil pollutants. A novel two stage circulating biological aerated filter (CBAF) was used to treat the alkaline wastewater after its neutralization. The factors of various air/water volumetric ratio, hydraulic retention time (HRT), which affected the removal of COD,...
Shrimp wastewater was studied by using photosynthetic bacteria sludge method. The results indicated that this method got better effects than single sludge or only photosynthetic bacteria treatment. The removal of the CODcr could reach 63%, the removal of the NH3-N could reach 92.5 %. Compared with conventional methods, it had easier operation, lower cost; and need not deal with the problem of sludge...
Constructed Rapid Infiltration system (CRI) is anew type of wastewater land disposal technique based on the traditional wastewater Rapid Infiltration. This paper was study on three step series CRI for removal of pollutants by using preparation of the pig manure wastewater. The results showed that the removal ratios of COD and NH3-N reached 81.0%-94.5% respectively, and all the effluent concentration...
In order to investigate the effect of COD in aeration phase and variation of OUR, an anaerobic/aerobic SBR process was used for treating real domestic wastewater. The experiment was carried out in four cases with different COD concentration (91.3mg/L, 139.7mg/L, 211.7mg/L, 397.8mg/L) at the beginning of aerobic phase. During the first 30min of aerobic phase in each case, COD was still under decomposition...
This paper provided an energy saving process of uniform restricted aeration, analyzed the dynamic characteristic and conducted experimental test on tanning waste water. Results show that the microorganism activity have been improved greatly by enhancing the mass transfer. Under the conditions of inlet CODCr 427-750mg/L, BOD5 ranges from 224mg/L to 396mg/L, the outlet water is higher than industry...
In this study, the variation rule of biological activity of activated sludge in organic matter biodegradation, nitrification and denitrification process in SBR system was investigated by determining INT-ETS activity of various influent nitrogen and organic shock loading. The experimental results showed that: INT-ETS activity could provide a good indication of the ongoing biological reactions of SBR...
A novel bioflocculant-producing bacterial strain B-28 was screened from contaminative soils by gas oil wastewater. The optimum carbon sources, nitrogen sources, metal ions and initial pH were glucose, yeast extract, 2 ml 0.1% FeCl3 and 6-8, respectively. And at the optimal couture conditions, flocculating activity reached its maximum flocculating activity of 97.2% at 72 h. This indicated that the...
In this study, according to the specific characteristics of acrylonitrile wastewater, Effective Microorganisms (EM) was used as Contact oxidation strain. The optimum conditions of EM bacteria domestication and contact oxidation treatment, such as pH, concentration and temperature, was confirmed. In addition, the results of aerobic treatment of wastewater suggested that COD effluent reduced to below...
Performances of a slow sand filter used in tertiary treatment of domestic wastewater were evaluated by a lab scale test. Influent and effluent COD, turbidity, color and total bacterial counts were analyzed for more than one year. All results showed that, performances of the slow sand filter were nearly the same with its filtration rate 0.3 m/h or 0.1 m/h., but decreased dramatically when its filtration...
A four-compartment ABR with an effective volume of 28 L was used to investigate the application of an anaerobic baffled reactor (ABR) in treating sugar-producing wastewater. The results indicated that the reactor could start up at an influent OLR of 2.5 kgCOD/m3-d and temperature of 35degC. COD removal rate could reach 89% on the 5th day. Then the influent COD increased from 5000 to 8000 mg/L, HRT...
A pilot-scale constructed wetland (CW) process was used as a backbone system to treat the secondary effluent and reuse them to supply the water body or irrigation instead of the clean water. This paper describes the design of the process as well as the operating results of the station. The design of the process emphasized efficiency, economy, simplicity, reliability, low construction cost and low...
The applied OLR and SLR are among the important parameters to govern bioreactor performance and the sludge characteristics. After successful aerobic granulation in a SBR, the OLR was increased stepwise from 4 to 12 g/(L-d) until the aerobic granules disintegrated into flocculent sludge. Effects of these loading rates on bioreactor performance and sludge surface characteristics such as exocellular...
Fishmeal wastewater (FWW) and starch wastewater (SWW), without additional nutrients, were investigated for the direct lactic acid production using 2 strains of Rhizopus genus. R.oryaze AS 3.254 could use FWW and SWW simultaneously for lactic acid production and fungal growth while R.oryaze 3.41 only utilized this complex for fungal growth. For R.oryaze AS 3.254, the optimal C/N for lactic acid...
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