# Water Consumption, Quantity and Quality of Wastewater and Sewage Sludge from Polish Dairies
## 3 Results and Discussion
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Production Profile**} & **Quantity of** & **Does the WWTP** & **Daily** & **Annual** & **Are the** \\  & & **Processed Milk** & **Treat Production** & **Amun of** & **Sewage Sludge** & **Amount of** & **Sludge Used** \\  & & **[L/d]** & **and Domestic Wastewater?** & **[m/d]** & **Processing Technology** & **Sludge** & **for** \\ \hline \multirow{4}{*}{1} & Production of outage & & & & & & \\  & cheese, cheese, drinking & & & & & & \\  & milk (basketized), butter, yoghurt, buttermilk, kefir, cream & & & & & & \\ \hline
2 & no data & 30,000 & YES & 140 & Aerobic & 15 & NO \\ \hline \multirow{4}{*}{3} & Production of outage & & & & & & \\  & cheese, fermented drinks,, veterans, milk powder & & & & & & \\ \hline
4 & no data & 180,000 & YES & 1040 & Aerobic & 237.6 & YES \\ \hline \multirow{4}{*}{5} & Production of dairy & & & & & & \\  & products, hard cheese, & & & & & & \\  & coffee cheese, whey and & & & & & & \\  & milk powder & & & & & & \\ \hline \multirow{4}{*}{6} & Production of matured & & & & & & \\  & cheese, octage cheese, & & & & & & \\  & fermented drinks, butter, & 752,150 & YES & 1600 & an external biogas plant & 9843.58 & no data \\  & powders (milk + wive), & & & & & together with the & \\  & whey concentrate & & & & & post-flotation sludge & & \\ \hline
7 & no data & 756,903 & YES & 2413 & Aerobic and anaerobic & 21,900 & YES \\ \hline \multirow{4}{*}{8} & Production of hard cheese, & & & & & & \\  & magazine checks, cheese, cheese & & & & & & \\  & packaging, production of & & & & & & \\  & production of whey & & & & & & \\  & powders (WPC, lactose, & & & & & \\  & permeate) & & & & & & \\ \hline
9 & no data & 1,000,000 & YES & 1533 & Aerobic & 3508 & YES \\ \hline
10 & no data & 1,100,000 & YES & 2250 & Aerobic & 600 & YES \\ \hline \multirow{4}{*}{11} & Milk processing, production & & & & & & \\  & of cottage cheese, cream, & & & & & & \\  & yoghurt & & & & & \\  & & & & & & \\  & products, milk powder, & & & & & \\  & organese, butter, & & & & & \\  & granulated cheese, whey & & & & & \\  & concentrate, cheese & & & & & \\  & packaging & & & & & \\ \hline
13 & no data & 2,800,000 & YES & 8710 & Aerobic and anaerobic & 4181 (646 DM) & YES \\ \hline \multirow{4}{*}{14} & Production of processed & & & & & & \\  & cheese and ripened cheese & no data & YES & 90 & Sludge screw & \\  & cheese and ripened cheese & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Sewage sludge management. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{No.} & **Quantity of** & **Class the MWF** & **Strong Stage Stage** & **Class the  
The analyses of the content of heavy metals, mercury (0.01-0.28 mg/kg DM), lead (2.49-16.52 mg/kg DM), cadmium (0.25-1.18 mg/kg DM), chromium (6.50-20.57 mg/kg DM), nickel (3.51-16.70 mg/kg DM), copper (8.19-133.40 mg/kg DM) and zinc (87.30-1138.0 mg/kg DM), showed that the concentrations found were well below the values specified in European Council Directive 86/278/EC for application on agricultural land [59]. They did not differ significantly from the values provided in articles on the quality of sewage sludge from Polish dairy WWTPs in the early 2000s [15; 17] and in flotation sludges from the pre-treatment of dairy wastewater in the DAF [60]. The pH value of the sewage sludge ranged from 6.05 to 12.1. The higher values result from the use of lime during sludge stabilization, e.g., from the DAF. The pH value of the sewage sludge is not a parameter that determines its suitability for agricultural use. The pH value of the soil in the agricultural areas where the sewage sludge is to be used is important; it must not be below 5.6 [59]. When analysing the results, it was not possible to establish a relationship between the quality characteristics of the sludge and the quantity of milk processed or the volume of wastewater treated and the technology of wastewater and sludge treatment.