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Quality of wastewater

The concept of quality of the wastewater as it occurs in sewers is an important issue. A major aspect is to consider the sewer as a reactor for primarily [Pg.37]

Several phenomena make a sewer a complex system for microbial processes in wastewater  [Pg.38]

The redox conditions established in a sewer network are of major importance for the development of the microbial community, the course of the microbial processes and the entire impact on the sewer, the treatment processes and the environment. [Pg.38]

A number of examples will illustrate why the quality of the wastewater in the sewer is important  [Pg.38]

These examples show that when excluding substances like heavy metals and organic micropollutants, the wastewater quality is closely related to the microbial biodegradability of organic matter. This characteristic feature is not [Pg.38]


Treatment plants are operated without ongoing monitoring of the quality of wastewater... [Pg.56]

Wastewater reclamation was pioneered using advanced conventional treatment processes to upgrade the water quality of wastewater to reusable standards. When RO was first introduced to produce water closer to drinking water quality from wastewater, a conventional treatment process was employed as pretreatment to the RO. A typical conventional pretreatment configuration would include flocculation, lime or alum clarification, recarbonation, settling, filtration, and activated-carbon adsorption. Biological activity is controlled by chlorination. [Pg.245]

In a pilot-scale study conducted by Raj ala and co-workers (40), rapid sand filtrahon combined with the use of poly aluminum chloride coagulation was used as a pretreatment to improve the quality of wastewater effluent before further treatment with UV irradiahon. Rapid sand hltration reduced suspended solids, turbidity, color, and microbes by about 90%, 70-80%, 20-50%, and 90-99%, respechvely, which improved the UV transmittance of water by up to 20%. The UV irradiation further reduced the number of microbes. More than 99.9% reduction of MS 2 was achieved with the dose of 140 mW-s/cm. Rapid sand hltration and the subsequent UV irradiation reduced the number of all the tested microbes to a low level, often below the detection limit. [Pg.348]

The quantity and quality of wastewaters are determined by direct measurements, calculation, or modelling. Figure 3.42 lists the changes in the quality and quantity of wastewaters expressed by two indicators. [Pg.215]

In the individual production sections so-called technological wastewaters are produced which have certain typical properties and composition. In addition to these, normal sewage waters occur in the works, and in the rainfall periods the contribution of the rainfall waters must be omitted. Therefore, wastewaters from industrial operations are a mixture of different types of wastewaters. Industrial wastewater treatment is therefore much more complicated and difficult than the treatment of sewage waters. Also, the effect of such water when discharged into a recipient is different and in most of cases also more harmful because the quantity and quality of wastewaters in industry is noted for high variability, and maxima and minima are not necessarily in agreement with the extremes in the changes of municipal wastewaters. [Pg.224]

The quality of wastewaters is given by the character of substances present in them, the degree of their pollution is given by the concentration of particular substances occurring in them. The substances in industrial was-... [Pg.229]

In many cases, the quality of a stream or another water source can be adequately improved by removing more BOD or suspended solids. In other iastances, the effluent is prepared for groundwater recharge which may require only the removal of nutrient. A classification of wastewater treatment processes is given ia Table 3. Table 4 summarizes water quality criteria for various iadustrial uses (10). [Pg.292]

There ai e noted the most convenient, simple and chip methods, which ensure the high quality of specimens and can be easily combined with different techniques for analytical pre-concentration of impurities. In particulaidy, it is proposed to make specimens in the form of gel, film or glass in the case of XRF analysis of concentrates obtained by low-temperature crystallization of aqueous solutions. One can prepai e film or organogel specimens from organic concentrates obtained by means of extraction of impurities by organic solvent. Techniques for XRF analysis of drinking, natural and wastewater using considered specimens ai e adduced. [Pg.252]

Wastewater disposal costs depend on the area and, of course, the quality of the wastewater. In one plant, the wastewater was sold to an oil company for secondary oil recovery. However, the cost of treating and filtering the wastewater far exceeded the revenues from the oil company. [Pg.239]

Environmental factors include (a) the impact of control technology on ambient air quality (b) the contribution of the pollution control system to the volume and characteristics of wastewater and solid waste generation and (c) maximum allowable emissions requirements. [Pg.22]

If the water quality of a water body is potentially affected by a proposed action (e.g., construction of a wastewater treatment plant), a NPDES permit may be required. The Environmental Protection Agency is responsible for this program however, in most cases, has turned this responsibility over to the states as long as the individual state program is acceptable. [Pg.27]

The higher the quality of the surface waters providing the supply, the more stringent will be the treated wastewater discharge consent standards imposed by the NRA on effluents returned to the surface waters. [Pg.37]

Although certain variability in the quality of the WWTP effluent was found, regenerated wastewater by the selected process resulted of a good constant composition in the measured parameters, with important reduction of all the measured pollutants. Disinfection by UV achieved almost 100% of effectiveness in the destruction of microorganisms ( . coll). Conductivity, turbidity or TDS parameters... [Pg.119]

Treated wastewater salinity and the high cost of hydraulic facilities are other constraints in the development of the sector and limit project profitability. Improving quality of treated wastewater is still one important challenge for the government that could improve the reuse rate. While any quality of treated wastewater can be produced, the degree of treatment must be addressed what constituents have to be removed and what quality will be acceptable [14]. [Pg.169]

This chapter aims to review current knowledge on the effects of wastewater treatment plant (WWTP) inputs (as major nutrient point sources) on stream nutrient dynamics, with major emphasis on nutrient loads and in-stream nutrient retention, and to discuss its implications within the context of actual and future scenarios of water scarcity conditions. Following this introduction, the second section of this chapter describes water quality problems associated with wastewater inputs from urban areas and how they are faced within the context of increasing urbanization across the world and its higher impact on water availability. In the third section, we... [Pg.174]

Kasprzyk-Hordem B, Dinsdale RM, Guwy AJ (2009) The removal of pharmaceuticals, personal care products, endocrine disrupters and illicit drugs during wastewater treatment and its impact on the quality of receiving waters. Water Res 43(2) 363-380... [Pg.225]

Alternatively, hexavalent chromium can be reduced, precipitated, and floated by ferrous sulfide. By applying ferrous sulfide as a flotation aid to a plating waste with an initial hexavalent chromium concentration of 130 mg/L and total chromium concentration of 155 mg/L, an effluent quality of less than 0.05 mg/L of either chromium species can be achieved if a flotation-filtration wastewater treatment system is used.15... [Pg.245]


See other pages where Quality of wastewater is mentioned: [Pg.10]    [Pg.37]    [Pg.39]    [Pg.119]    [Pg.133]    [Pg.632]    [Pg.215]    [Pg.228]    [Pg.808]    [Pg.36]    [Pg.10]    [Pg.37]    [Pg.39]    [Pg.119]    [Pg.133]    [Pg.632]    [Pg.215]    [Pg.228]    [Pg.808]    [Pg.36]    [Pg.294]    [Pg.307]    [Pg.407]    [Pg.239]    [Pg.556]    [Pg.644]    [Pg.67]    [Pg.97]    [Pg.103]    [Pg.148]    [Pg.170]    [Pg.170]    [Pg.177]    [Pg.477]    [Pg.66]    [Pg.80]    [Pg.267]    [Pg.901]    [Pg.950]    [Pg.1243]   
See also in sourсe #XX -- [ Pg.10 , Pg.37 ]




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Wastewater quality

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