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Soluble microbial products (SMP) formed by microorganisms in wastewater treatment plants (WWTPs) adversely affect final effluent quality and treatment efficiency. It is difficult to distinguish SMP from residual proteins, lipids and carbohydrates present in the influent that may persist during treatment. No method is currently available to determine quantitatively the extent to which SMP contribute...
In the pilot scale test, three kinds of typical natural solid phase materials, such as cotton, anthracite and walnut shells, were used as biological denitrification carbon sources in the remediation of nitrite contaminated groundwater. The results indicated that when the influent concentration of nitrate was about 30mg/L, the nitrate removal of the reactors with cotton and walnut shells as carbon...
Sea outfall systems are cost-effective solutions for final disposal of the wastewaters generated in coastal areas. Main design parameters of an outfall system are flow rate, initial bacteria concentration of the effluent, time required for 90% reduction of bacteria (T90), ambient currents, discharge depth and outfall length. Discharge depth and outfall length are certain parameters whereas the other...
The river watershed is one of the main drinking water resources. In addition it provides many recreational usages. Knowledge about the composition of waste water is of paramount importance viewing the fact that these wastes are generally discharged into the rivers. Algae which thrive well in wastes not only reduce the pollution potential of the waste water by cleaning nutrients but also constitute...
Coking wastewater was treated by process of biological filter(BF) and bio-fluidized bed (BFB) with a special kind of carrier. The pretreated wastewater contained much more phenolic compounds with about 1460 mg/L of COD and 360 mg/L of NH+4-N. The wastewater treatment effect of this process was examined during biofilm colonization and operates formally. During biofilm colonization period, the treatment...
The analysis of steroid estrogens (Estrone (E1), 17β-estradiol (E2), and 17α-ethynylestradiol (EE2)) in wastewater samples is a problem of primary concern for quality control due to the toxicity level of these compounds and their public health risk. Solid phase extraction (SPE) was used to enrich and to clean up the aqueous samples and then high-performance liquid chromatography (HPLC) was used to...
This paper presented the operation results in the full-scale suspended carrier biofilm (SCB) process for the treatment of the low C/N ratio monosodium glutamate wastewater (MSGW). After the long-term operation of 185 days, the removal efficiencies of COD, total nitrogen (TN) and ammonia nitrogen (AN) achieved above 89.5%, 91% and 92.5% at the influent organic loading rate (OLR) of 1.25-1.8 kgCOD/(m...
The bio-dopp process was used to treat papermaking midcourse wastewater. The CODcr, BOD5 and color removal rate were investigated through the self-made experimental system. The CODcr removal rate of reactor was higher than 90%, the BOD5 removal rate reached 96~99% as the BOD5 of effluent was less than 10 mg/L, the chroma of effluent reached 50 multiple. Moreover, the sludge concentration was about...
The genric and amounts of microorganisms and effects of condition on microorganisms were investigated in sequence constructed wetland process, as well as removal COD, NH4+-N and TP efficiency were investigated. The results obtained from test indicated that: there were 9 kind strains of microorganisms in constructed wetland, the major factor influencing the occurrence of each strain is the dissolved...
In order to improve the quality of the river water, raise constructed rapid infiltration(CRI) system was constructed. Practice shows that the location and layout of this ecological engineering conform to the source of pollution, and the system is a new technology which combines natural, social and economic systems in one. In effluent of CRI, the removal rates of CODcr, NH3-N, TN, BOD5, SS and TP are...
Starch wastewater has high turbidity and COD, heavy odor after anaerobic processing. Discharging this kind of sewage could cause serious environmental pollution, and therefore it need to be treated and reached the national standard before discharge. This experiment based on the specific characteristics of starch wastewater. The process was designed as follows: after anaerobic hydrolysis prior to degradation...
Two kinds of pilot subsurface wastewater infiltration system (SWIS), named group A and group B were constructed in the laboratory. Group A was filled with mixed substrates composed of 80% meadow brown soil (MBS) and 20% cinder, while 80% MBS and 20% sand in group B. Both of the SWIS worked stably in an intermittent feeding mode during the period of the experiment. Under the hydraulic loading of 8-10m...
Microorganisms can photoreactivate after ultraviolet radiation on the effluent from WWTP. The effect of ultrosonic pretreatment collaborating to control E. coli' s photoreactivation by UV disinfection is studied in this essay. It is found that there is a good linear relationship between UV irradiation dose and E. coli' s inactivation rate, and the interrelated coefficient is 0.99. When US collaborating...
Monosodium glutamate (MSG) wastewater is a very refractory case of high strength organic wastewater. To investigate the effect of operating variables on treatment of MSG wastewater, a laboratory scale study was conducted. The treatment of MSG wastewater was studied in a continuous flow anaerobic fluidized blanket (UASB) reactor. The effect of operating variables such as organic volumetric load rate...
The study purpose was to study the nitrification and nitrogen removal performance in IAL-CHS by lab-scale experimental bulk.the removal rate of ammonium (NH4+-N) was enhanced from 5.00% to 85.70% within 24 h by inoculated nitrification sludge. Removal performance of NH4+-N and TN were evaluated in IAL-CHS, The results showed that the average removal rate of NH4+-N was 56.2%, 39.0% and 25.8% under...
The oxidation of ammonia nitrogen at a low concentration in synthetic micro-polluted water by immobilized nitrobacteria pellets in inner-circulated biological fluidized bed reactor was investigated with the system operated continuously under the condition of temperature 20~30CC, DO 3~5 mg/L. The concentrations of effluent NH4+-N and NO2--N are below 0.3 mg/L at the influent concentration of 10~15...
Technology of O3-lmmobilized Bacterial Activated Carbon (IBAC) was used to develop a set of high quality drinking water producing system equipment. Water quality of influent and of effluent were monitored, results showed that permanganate index declined to 1.42 mg/L from 4.15 mg/L, which meant removal rate was 65.87%. Turbidity of influent was 2.75 NTU and of effluent was 0.53 NTU, which meant average...
The height of vermibed is considered as an important factor in vermifilter. Parallel vermifilters with vermibed height of 30, 50, 70, 100 and 150 cm (defined as H30, H50, H70, H100, H150, respectively) were operated to determine the impact on excess sludge treatment. The physiological response of earthworms was also studied. H30, H50, H70 could run steadily, while H100 and H150 appeared phenomenon...
Two metabolic uncoupling processes of sequencing batch bifilm reactor (SBBR) and conventional activate system (CAS) were carried out under consecutive aerobic-setting-anaerobic (OSA) operational process at the SRT of 70 days. The yield and characteristics of sludge and wastewater treatment effects in the two reactors were analyzed in parallel. And the sludge observed yield coefficient (Yobs) were...
In this study, compound bioflocculant-producing bacteria, named F2-F6, were adopted as bioflocculant (BF) producer. In order to domesticate the strains of F2-F6 to utilize the effluent from a hydrogen-producing bioreactor as the only carbon resource, a method of poor-rich alternative nutrition was developed. After acclimation, the optimum fermentation conditions were investigated using only the effluent...
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