otal fixed dissolved solids FDS Settleable solids To determine those solids that will settle by gravity in a pec o assess the performance of treatment processes Used to assess the guality of treated wastewater Light brown, gray y, black To assess the condition of wastewater(fresh or septic) Transmittance T Used to assess the suitability of treated effluent for UV disinfection TON To determine if odors will be a problem Temperature mportant in the design and operation of biolog ical rocesses in treatment facilities Conductivity Used to assess the suitabil ity of treated effluent fo Inorganic chemical characteristics NHat Used as a measure of the nutrients present and the degree of decomposition in the wastewater; the oxid ized forms can TKN be taken as a measure of the degree of oxidation Inorg phospnorus a measure of the acidity or basicity of an aqueous solution ΣHCO3“CO32+OHHA Chloride Cl To assess the suitabil ity of the wastewater for agricu Itura Sulfate SOa To assess the potential for the formation of odors and may ty of the waste sludge Metals As, Cd, Ca, Cr, Co, Cu, Pb, Mg Hg, M To assess the suitability of the wastewater for reuse and fo o, NL Se, Na, Zn toxicity effects atment Trace amounts of metals are mportant in biological treatment. To assess presence or absence of specific constituents len O2,CO2,NH3,H2SCH4 To assess presence or absence of specific gas Organic chemical characteristics ive-day carbonaceous CBODs A measure of the amount of oxygen required to stabilize a biochem ical oxyge waste biologically Ultimate carbonaceous UBOD(BODu, BODL) A measure of the amount of oxygen required to stabilize a biochemical oxygen biologically Nitrogenous oxygen NOD A measure of the amount of oxygen required to oxidize en in the wastewater to nitrate oxygen COD Often used as a substitute for the bod test Total organic carbon TOC Often used as a substitute for the bod test MBAS. CTAS To determine presence of specific organic compounds and compounds and classes to assess whether special design measures will be needed Biological characteristics MNP To assess presence of pathogenic bacteria and effectivenes Specific organisms Bairusescter ia, protozoa, helminth To assess presence of specific organ isms in connection2-2 Total fixed dissolved solids FDS Settleable solids To determine those solids that will settle by gravity in a specified time period Particle size distribution PSD To assess the performance of treatment processes Turbidity NTU Used to assess the quality of treated wastewater Color Light brown,gray,black To assess the condition of wastewater(fresh or septic) Transmittance %T Used to assess the suitability of treated effluent for UV disinfection Odor TON To determine if odors will be a problem Temperature ℃ Important in the design and operation of biological processes in treatment facilities Density ρ Conductivity EC Used to assess the suitability of treated effluent for agricultural applications Inorganic chemical characteristics Free ammonia NH4 + Used as a measure of the nutrients present and the degree of decomposition in the wastewater;the oxidized forms can be taken as a measure of the degree of oxidation Organic nitrogen Org N Total Kjeldahl nitrogen TKN Nitrates NO2 - Total nitrogen TN Inorganic phosphorus Inorg P Total phosphorus TP Organic phosphorus Org P pH pH A measure of the acidity or basicity of an aqueous solution Alkalinity ∑HCO3 -+CO3 2-+OH- -H + A measure of the buffering capacity of the wastewater Chloride Cl- To assess the suitability of the wastewater for agricultural reuse Sulfate SO4 2- To assess the potential for the formation of odors and may impact the treatability of the waste sludge Metals As,Cd,Ca,Cr,Co,Cu,Pb,Mg,Hg,M o,Ni,Se,Na,Zn To assess the suitability of the wastewater for reuse and for toxicity effects in treatment.Trace amounts of metals are important in biological treatment. Specific inorganic elements and compounds To assess presence or absence of specific constituents Various gases O2,CO2,NH3,H2S,CH4 To assess presence or absence of specific gases Organic chemical characteristics Five-day carbonaceous biochemical oxygen demand CBOD5 A measure of the amount of oxygen required to stabilize a waste biologically Ultimate carbonaceous biochemical oxygen demand UBOD(BODu,BODL) A measure of the amount of oxygen required to stabilize a waste biologically Nitrogenous oxygen demand NOD A measure of the amount of oxygen required to oxidize biologically the nitrogen in the wastewater to nitrate Chemical oxygen demand COD Often used as a substitute for the BOD test Total organic carbon TOC Often used as a substitute for the BOD test Specific organic compounds and classes of compounds MBAS,CTAS To determine presence of specific organic compounds and to assess whether special design measures will be needed for removal Biological characteristics Coliform organisms MNP To assess presence of pathogenic bacteria and effectiveness of disinfection process Specific organisms Bairusescteria,protozoa,helminth es,v To assess presence of specific organisms in connection with plant operation and for reuse